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A new genus and species of pomacentrid fish (Perciformes) from the Eocene of Bolca in northern Italy

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A new genus and species of pomacentrid fish, Sorbinichromis francescoi, is described based on a single skeleton from the Eocene locality of Bolca in northern Italy. Sorbinichromis gen. nov. is characterized by a unique combination of vertebral (10+15=25) and unpaired fin-ray counts (D XI, 12; A II, 10; C 4, I,8-7,I, 3), long pelvic fins, and the possession of two supraneurals.
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A new genus and species of pomacentrid sh (Perciformes)
from the Eocene of Bolca in northern Italy
ALEXANDRE F. BANNIKOV*, DAVID R. BELLWOOD**
(*Borisyak Paleontological Institute of the Russian Academy of Sciences, Moscow, Russia)
(**School of Marine and Tropical Biology and ARC Centre of Excellence for Coral Reef Studies, James Cook University,
Townsville, Australia)
A
A new genus and species of pomacentrid sh, Sorbinichromis francescoi, is described based on a single skeleton from the Eocene locality
of Bolca in northern Italy. Sorbinichromis gen. nov. is characterized by a unique combination of vertebral (10+15=25) and unpaired
n-ray counts (D XI, 12; A II, 10; C 4, I,8-7,I, 3), long pelvic ns, and the possession of two supraneurals.
Key words: Perciformes, Pomacentridae, new genus and species, Eocene, northern Italy, Bolca locality.
R
Sorbinichromis francescoi, nuovo genere e nuova specie della famiglia Pomacentridae, è descritto sulla base di un singolo scheletro
dell’Eocene di Bolca (Italia settentrionale). Sorbinichromis francescoi è caratterizzato dalla combinazione unica del numero di
vertebre (10+15=25) e di raggi delle pinne impari (D XI, 12; A II, 10; C 4, I, 8 – 7, I, 3), dalle lunghe pinne pelviche, e dalla
presenza di due supraneurali.
Parole chiave: Perciformes, Pomacentridae, nuovo genere e nuova specie, Eocene, Italia settentrionale, Bolca.
I
e Early Eocene sh fauna of the famous locality
Monte Bolca, to the north of Verona in northern Ita-
ly, is exceptionally rich in marine shes, especially the
acanthopterygians. Monte Bolca marks the rst fossil
record of many groups of shes found on modern cor-
al reefs (Bellwood, ). Some groups of Recent sh-
es (e.g., butteryshes and gobies) rst appeared on-
ly in the Oligocene or later in the Eocene; these were
represented in the Bolca assemblage by their extinct
ecological analogues (Bannikov, a, b). Except for
discoveries of fragmentary remains (pharyngeal jaws)
elsewhere, the Bolca sh fauna establishes the earliest
known record of the Pharyngognathi, or Labroidei.
Bellwood () reviewed the status of the Bolca phar-
yngognath shes and found that the genera Odonte-
obolca Krell (=Odonteus Agassiz), Gillidia Eastman and
Eolabroides Eastman appear to be non-pharyngognaths,
whereas Labrus ? valenciennesi Agassiz is an indetermi-
nate non-labroid pharyngognath. He stated (Bellwood,
) that the Bolca sh fauna contains at least six la-
broid taxa: two monotypic genera in the Labridae (Eo-
coris Bannikov et Sorbini and Phyllopharyngodon Bell-
wood), two monotypic genera in the Pomacentridae
(Palaeopomacentrus Bellwood et Sorbini and Lorenzich-
thys Bellwood), as well as a range of other labroids of
less certain anity, including the Tortonesidae (mono-
typic family established for the genus Tortonesia Sorb-
ini: Sorbini et al., ) and the genus Sorbinia Bell-
wood. e latter (with type species S. caudopunctata)
was described by Bellwood () based on a single
specimen with a somewhat damaged caudal n. Bell-
wood () indicated the caudal-n formula of the
holotype as +-?+. Subsequently seven more speci-
mens of S. caudopunctata were located in the collec-
tion of the Museo Civico di Storia Naturale di Verona
(MCSNV) in addition to a specimen in the private col-
lection of the family Cerato in Bolca (gured in Cer-
ato, ): MCSNV , MCSNV T/T, MC-
SNV T/T, MCSNV T, MCSNV IG/
IG, MCSNV IG/ IG, and MCS-
NV IG (the latter specimen was erroneously clas-
sied with the Mullidae: Blot, : ; see Bannikov,
). Most of these have a well-preserved caudal n,
and the caudal-n formula of S. caudopunctata should
be regarded as -, I+-+I, .
Following the review of the Bolca labroids (Bell-
wood, ), a new genus and species Quasicichla mu-
cistonaver was described and interpreted as closely relat-
ed to the family Cichlidae (Bannikov, b). Recently,
the third taxon attributable to the Labridae, Bellwood-
Studi e ricerche sui giacimenti terziari di Bolca, XV - Miscellanea paleontologica, 12, 2014: 7 - 14
8
ALEXANDRE F. BANNIKOV - DAVID R. BELLWOOD
ilabrus landinii Bannikov et Carnevale, was described
from the Monte Bolca locality, Pesciara cave site (Ban-
nikov and Carnevale, ).
Among the putative labroids held in the collection
of the MCSNV there are three specimens of the sh
gured by Caltran and Zorzin () and provisional-
ly placed in the labroid family Embiotocidae. is sh
was subsequently described as an incertae sedis percoid
Frippia labroiformis (Bannikov and Carnevale, ).
Revision of the morphology and systematic position
of Bradyurus (=Eolabroides) szajnochae (de Zigno, )
conrmed the conclusion of Bellwood () that this
taxon is non-pharyngognath; it is regarded as a percoid
of uncertain anity, although it may have haemulid re-
lationships (Bannikov and Zorzin, ).
Given the growing evidence that the Labroidei sen-
su lato is not monophyletic, Bannikov and Carnevale
() proposed that the labroid anities of Quasicich-
la, Sorbinia and Tortonesia should be reconsidered. e
Pomacentridae, although pharyngognath, are no long-
er regarded as labroids and recent molecular evidence
suggests a distant relationship with other labroids, al-
though the close relationship with the Cichlidae re-
mains (Near et al., )
Of the two pomacentrid species recorded from Bol-
ca, Palaeopomacentrus orphae was originally described
(Bellwood and Sorbini, ) based on two specimens
(MCSNV IG Holotype; BMNH P  Paratype).
e specimens were relatively intact with traces of pig-
mentation, including a dorsal ocellus reminiscent of
those on Recent species in the family. e second poma-
centrid species Lorenzichthys olihan (Bellwood ) was
based on a single specimen, although the head area was
poorly preserved. A distorted specimen MCSNV T
(in the same slab with the percoid Acropoma lepidotum),
and somewhat damaged MCSNV IG may also be-
long to Palaeopomacentrus orphae.
Among the fossil shes housed in the collection of
the MCSNV there is a specimen which can be inter-
preted as belonging to a new genus and species of the
Pomacentridae. It is the third damselsh taxon known
from the sh fauna of Monte Bolca. is sh is de-
scribed below.
M
e specimen was examined using a stereomicro-
scope with attached camera lucida drawing arm. Some
details of the specimen examined were best seen when
the specimen was moistened with alcohol. e speci-
men was prepared by needle.
Interneural and interhaemal spaces are numbered
based on the vertebra whose neural or haemal spine
forms the anterior border of the space, with the rst
space being between the rst and second neural or hae-
mal spines (following Baldwin and Johnson, ; Ban-
nikov and Tyler, ; Tyler and Bannikov, ; etc.).
Abbreviations are as follows: Institutional: MCSNV
- Museo Civico di Storia Naturale di Verona; Anatomi-
cal: HL - head length; PU - preural vertebra; SL - stand-
ard length; U - ural vertebra.
S D
Order Perciformes
Family Pomacentridae Girard, 
Genus Sorbinichromis gen. nov.
Diagnosis
Relatively deep-bodied sh with a short and deep cau-
dal peduncle. Head relatively small. Maximum body
depth strongly exceeds head length. Supraoccipital crest
deep and pointed. Lower jaw articulation under mid-
dle of orbit. Mouth relatively small.  (+) verte-
Fig.  - Sorbinichromis francescoi gen. et sp. nov., holotype, part and
counterpart: A - MCSNV IG, B - MCSNV IG; Low-
er Eocene of Bolca in northern Italy, Pesciara. Scale division:  mm.
9
A new genus And species of pomAcentrid fish (perciformes) from the eocene of BolcA in northern itAly
brae. Supraneurals . Dorsal n long-based and con-
tinuous, with  strong spines and  soft rays. ere
is slight notch between spiny and soft portions of dor-
sal n. Anal n with  supernumerary spines (nd very
strong) and  rays. Postcleithrum strong. Pelvics in-
serted just behind pectorals, strongly elongated. Cau-
dal n truncated. Scales relatively large, thick at dorsal
and ventral contours of body. Lateral line follows dor-
sal contour of body and interrupted below anterior por-
tion of soft dorsal n.
Type Species
Sorbinichromis francescoi sp. nov., by monotypy and
designation herein.
Etymology
e genus is named in honour of the late Lorenzo Sorb-
ini, preeminent Italian paleoichthyologist and a dear
friend of both authors; and the genus Chromis; gen-
der masculine.
Composition
Type species only.
Sorbinichromis francescoi sp. nov.
Figures , 
Diagnosis
As for the genus.
Etymology
e species is named in honour of the son of Loren-
zo Sorbini, Francesco, who kindly made the photos of
Bolca shes for this and many other papers.
Holotype
MCSNV IG/, part and counterpart, com-
plete skeleton relatively poorly preserved and somewhat
damaged by fractures,  mm SL.
Referred Specimens
None.
Type Locality And Horizon
Monte Bolca locality, Pesciara cave site; Early Eocene,
late Ypresian, middle Cuisian, SBZ , Alveolina dainel-
lii Zone (see Papazzoni and Trevisani, ).
Fig.  - Sorbinichromis francescoi gen. et sp. nov., reconstruction of the skeleton based on holotype, scales omitted.
10
ALEXANDRE F. BANNIKOV - DAVID R. BELLWOOD
Description
e body is relatively deep, with a short and deep cau-
dal peduncle. e body depth is less than half the SL.
e caudal peduncle depth is about . of the body
depth. e head is relatively small; its length is about
. times in the body depth. e head length is con-
tained approximately . times in SL. e dorsal pro-
le of the body is almost equally as convex as the ven-
tral prole of the body.
Head. e head is slightly deeper than long. e or-
bit is moderate and placed relatively high on the head
depth. e horizontal diameter of the orbit is about -
 HL. e snout is slightly shorter than the orbit
diameter. e mouth is relatively small and terminal.
e lower jaw articulation is situated below the middle
of the orbit. Faint remains of some infraorbital bones
bearing suborbital branch of the lateral line sensory ca-
nal are recognizable in the holotypic counterpart MC-
SNV IG . e neurocranium is relatively deep,
with the supraoccipital crest strongly developed, trian-
gular and pointed. e ethmoid region is short. e
parasphenoid is strongly fragmented; it seems to pass at
the lower border of the orbit. e upper jaw bones are
incompletely preserved, with the premaxilla best seen
in MCSNV IG , whereas the maxilla in MCS-
NV IG . e premaxilla has a moderate ascend-
ing process divided from an articular process. Few pre-
maxillary teeth are preserved, these are small, slender
and unicuspid. No supramaxilla is evident. e lower
jaw is badly damaged; its length is about - HL.
e dentary has oblique symphysis. e dentition of
the dentary is equal to that of the upper jaw; the small
sharp teeth being dark at their tips. e hyomandibu-
lar shaft is slightly inclined from the vertical line. De-
tails of the structure of the suspensorium and pterygoi-
ds are not clear. e thin endopterygoid forms the oor
of the orbit. e opercular region is rather broad, with
individual bones being indistinct. None of the branchi-
al and hyoid bones are recognizable, except for the faint
remains of what seems to be the lower pharyngeal jaw
in MCSNV IG . No pharyngeal teeth are evident.
Axial skeleton. ere are most probably  vertebrae,
including the urostyle: ten abdominal and fteen cau-
dal (the anteriormost vertebrae are hardly recogniza-
ble). e axis of the vertebral column is sigmoid and
elevated anteriorly. e vertebral centra are mostly rec-
tangular in lateral view, they bear poorly developed
longitudinal lateral ridge on each side. e length of
the caudal portion of the vertebral column is . times
greater than the length of the abdominal portion of the
vertebral column. e vertebral spines are moderately
long and robust, straight or slightly curved. e neu-
ral spines of most of the anterior abdominal vertebrae
are more strongly expanded than those of the succeed-
ing vertebrae. e haemal spines of most of the caudal
vertebrae are longer and more strongly inclined to the
axis of the backbone than the opposite neural spines.
e parapophyses are poorly recognizable in the poste-
riormost abdominal vertebrae. e pleural ribs are long
and rather slender, these rather strongly inclined pos-
teroventrally. None of epineurals are recognizable.
Pectoral n and girdle. Most of the pectoral girdle
bones are either not preserved or scarcely recogniza-
ble; however, the obliquely directed supracleithrum is
distinct, being strong and elongate. e ventral post-
cleithrum is also clearly visible; it is long and broad,
extending posteroventrally and terminating behind
the pelvic-n base. e pectoral n is not preserved;
its base can be tentatively reconstructed somewhere be-
low the fth vertebra in the middle of the distance be-
tween the vertebral column and the ventral prole of
the body, probably just anterior to the pelvic n.
Pelvic n and girdle. e pelvic bones are robust.
e pelvic ns contain a spine and probably ve soft,
branched rays. e pelvic n is long; its longest ray
reaches well behind the anal-n origin. e pelvic-n
spine is long but much shorter than the longest pelvic-
n soft rays; it seems to be no shorter than the longest
dorsal-n spine.
Supraneurals and dorsal n. ere are two relative-
ly slender supraneurals with minute apical projections.
e supraneurals seem to be accommodated between
the supraoccipital and the neural spine of the rst verte-
bra, i.e., in preneural space. e dorsal n is long-based
and continuous, with a slight notch between its spiny
and soft portions; it originates over the second verte-
bra and terminates over the -th vertebra. ere are
 dorsal-n spines and  soft segmented and branched
rays. e dorsal-n spines are relatively strong. e sec-
ond spine is the longest, subsequent spines gradual-
ly decrease in length posteriorly in the series. e sec-
ond spine is . times longer than the rst spine and
. times longer than the last spine. e rst dorsal-n
spine is supernumerary on the rst dorsal-n pterygio-
phore. e longest soft ray of the dorsal n (situated in
the middle of the soft portion) is . times longer than
the last dorsal-n spine. e length of the base of the
soft portion of the dorsal n is . times shorter than
the base length of the spiny portion of the dorsal n.
ere are a total of  dorsal-n pterygiophores. e
rst pterygiophore is large and sturdy, expanded an-
teroposteriorly, and bears a longitudinal strengthening
ridge and procumbent distal process; the succeeding
pterygiophores of spines are also broad, whereas those
11
A new genus And species of pomAcentrid fish (perciformes) from the eocene of BolcA in northern itAly
of soft rays become narrower and decrease in length
posteriorly in the series. e interneural spaces below
the dorsal n have the ventral shafts of one (most of the
n) or two (four spaces posteriorly) pterygiophores pre-
sent. ere are no vacant interneural spaces.
Anal n. e anal n is relatively short at the base;
it originates under the fth caudal vertebra and termi-
nates under the end of the dorsal n. ere are two
spines and ten soft, segmented and branched rays in
the anal n. e rst anal-n spine is weak, whereas the
second spine is very strong, being slightly longer than
the longest (second) dorsal-n spine. Both two anal-n
spines are supernumerary. e longest (anterior) anal-
n soft rays are longer than the longest dorsal-n soft
rays. e rst anal-n pterygiophore is very long and
sturdy, wedge-like in shape; it is inclined at an angle
≈° to the body axis. e succeeding anal-n pterygio-
phores are much shorter and slender; these decrease in
length posteriorly in the series.
Caudal n and skeleton. e caudal skeleton is badly
damaged by two fractures in the matrix. It is clear that
terminal centrum is composed of the fusion of PU, U
and U; however, conditions of the hypurals and pa-
rhypural are less easily recognizable. e neural spine of
PU seems to be a short crest. ere are at least two epu-
rals, the rst of which is curved and longest. e caudal
n is truncated, moderately long but deep. We recon-
struct  principal rays in the caudal n (I,-,I); there
are four procurrent rays above and three rays below.
Squamation. Large and thick scales cover the entire
body and the head. Some scales exhibit basal radii and
concentric striations; however, ctenii were not observed
at all (but there are no scales in the material with a well-
preserved apical eld). Scales are especially thick at the
dorsal and ventral contours of the body. Posterior por-
tion of the lateral line courses relatively high, it follows
the dorsal prole of the body and is interrupted below
the anterior third of the soft portion of the dorsal n.
No pigmentation is traceable.
Measurements. As percentage of SL of holotype:
head length = ; maximum body depth = ; caudal
peduncle depth = ; snout length = ; orbit diameter
= ; lower jaw length = ; distance between tip of the
snout and rst dorsal-n spine = ; distance between
tip of the snout and rst dorsal-n soft ray = ; dis-
tance between tip of the snout and anal n = .; dis-
tance between pelvic and anal ns = ; dorsal-n base
length = .; spinous dorsal-n base length = ; anal-
n base length = ; length of the rst dorsal-n spine =
; length of the longest dorsal-n spine = ; length of
the second anal-n spine = ; length of the pelvic n =
; length of the longest caudal-n ray = .
D
Sorbinichromis francescoi is the third pomacentrid
fossil to be recorded from Bolca. is species, along with
Palaeopomacentrus orphae and Lorenzichthys olihan, also
from Bolca, represent the entire pomacentrid fossil re-
cord to date (based on intact material) from the Paleo-
gene. Other pomacentrid material is restricted to Izuus
and Chromis from the Miocene of Japan and Algeria, re-
spectively (Bellwood and Sorbini, ). e skull of a
Pomacentridae indet. was described from the Miocene
of Italy (Carnevale and Landini, ). e imprint
of an incomplete skeleton was described by Prokof-
iev () from the Upper Oligocene or Lower Mio-
cene of Azerbaijan (erroneously indicated by Prokoev
as Dagestan, Russia), designated as Pomacentridae gen.
et sp. indet. However, the specimen lacks the important
pomacentrid synapomorphy, possession of two super-
numerary anal-n spines (Bellwood and Sorbini, ),
and cannot be placed in the family (see Bannikov, ).
Recognition of Recent families in the fossil record
can be fraught with diculties, often because of a lack
of suitable morphological synapomorphies (Bannik-
ov, b; Bellwood and Sorbini, ). Fortunately,
the Pomacentridae has at least one good synapomorphy
that is usually well preserved: two supernumerary anal-
n spines (Bellwood and Sorbini, ). While not
unique (also found in the Apogonidae), in combination
with other features it enables specimens to be clearly
separated from other families, including the closely-re-
lated Cichlidae (which usually has  anal spines) (dis-
cussed in Bellwood and Sorbini, ). e general
morphology, putative pharyngeal jaw, and two super-
numerary anal spines strongly support the placement
of Sorbinichromis in the Pomacentridae.
Other features and meristic counts of Sorbin-
ichromis preclude placement in any Recent genus. Sorb-
inichromis has fewer vertebrae and fewer spines and rays
than most extant taxa, although it does overlap in mer-
istics with Chrysiptera (D XI-XIV, -; A II, -; Ta-
ble ). It may, however, be separated from most extant
pomacentrids in the possession of  vertebrae (most
extant forms have  vs.  in Sorbinichromis) and two
supraneurals (a condition previously recorded only in
Premnas and Acanthochromis (Fitzpatrick, ; Table
). Furthermore, in Sorbinichromis the supraneurals are
unusual in that they appear to lie in front of the neural
spines, whereas in the Recent taxa with two supraneu-
rals the posteriormost supraneural inserts between the
rst two neural spines (Fitzpatrick, ). Like many
other groups (Siganidae, Acanthuridae, Ephippidae)
Sorbinichromis may be reliably placed within an extant
12
ALEXANDRE F. BANNIKOV - DAVID R. BELLWOOD
family but it represents a distinct new genus with no
Recent representatives.
e presence of a third pomacentrid genus in Bol-
ca (at about - Ma) is consistent with molecular ev-
idence of early diversication of the Pomacentridae in
the Eocene (Cooper and Westneat, ; Cowman and
Bellwood, , ). Furthermore, it adds weight to
the suggestion that the biogeographic location for the
origins of the major pomacentrid lineages was, as in
many other taxa (Renema et al., ), in the Tethys
rather than the Indo-Australian Archipelago as suggest-
ed by some reconstructions from molecular phyloge-
nies (Cowman and Bellwood, ).
e general body shape and ns of Sorbinichromis
are similar to Recent species that hang, often in schools,
above the reefs such as its namesake Chromis and oth-
er genera including Neopomacentrus, Amblyglyphidio-
don, and Chrysiptera. In Sorbinichromis, the small head,
small teeth and apparent absence of robust teeth in the
pharyngeal (in contrast to Palaeopomacentrus) are all
consistent with feeding on small, possibly planktonic
material, while the deep body and deep caudal pedun-
cle are indicative of relatively slow swimming speeds.
More specically, it was likely to be fast turning and fast
accelerating, but with relatively slow cruising speeds.
e peduncle depth is strongly correlated with caudal
n aspect ratio in surgeonshes (Bellwood et al., ),
with aspect ratios being a widely recognized indicator
of swimming ability (high aspect ratio and narrow pe-
duncle being indicative of high cruising speeds vs. low
aspect ratio and deep peduncles being indicative of rap-
id acceleration but limited sustained swimming abili-
ties) cf. Bellwood and Wainwright (). Taken in
concert, the morphology of Sorbinichromis strongly re-
sembles modern Chrysiptera, Chromis and Amblyglyphi-
dodon suggesting that it was a planktivore or omnivore
living in close proximity to a complex hard substratum.
is trophic categorization of Sorbinichromis is con-
sistent with the suggestion that the shes of Monte Bolca
mark the initial record of an expansion in high-precision
diurnal feeding on benthic hardgrounds or coral reefs
(Goatley et al., ). is may have also included ben-
thic planktivores such as Sorbinichromis. Interestingly,
while some sh groups in the Eocene exhibit morphol-
ogies that are indicative of extensive trophic divergence
(e.g. the Acanthuridae, Bellwood et al., ) the poma-
centrids show relatively little divergence, a pattern that is
reected in extant forms (Cooper and Westneat, ).
e three Bolca pomacentrid genera, although taxonom-
ically dierent from their extant counterparts, share with
modern forms a limited expression in terms of morpho-
logical and trophic specialization.
Overall, the description of a third pomacentrid ge-
nus, Sorbinichromis, highlights the importance of Bol-
ca in the early diversication of modern sh groups.
e Pomacentridae is now equal with the Labridae with
three described genera. ey are thus among the most
diverse families within this Lagerstätte, certainly among
the pharyngognath representatives.
A
We are very grateful to Dr. Giuseppe Minciotti, Di-
rector of the MCSNV for providing funding for the
travel of AFB in  to Verona to engage in this and
other studies. We also thank Dr. Roberto Zorzin and
Dr. Anna Vaccari at the MCSNV for their continuing
help in facilitating our research on the shes of Mon-
te Bolca; Dr. Leonardo Latella for editorial process-
ing of the manuscript; Christopher Goatley for assis-
tance with extant specimens, and Mrs. Bruna Burato
for her aid with the literature on Bolca shes. e re-
search of AFB was supported by the Russian Founda-
tion for Basic Research, project no. --. Prof.
David Bellwood was supported by the Australian Re-
search Council. Dr. Chiara Sorbini of the University of
Pisa translated the Abstract into Italian and Mr. Franc-
esco Sorbini (Verona) kindly made the photographs.
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14
ALEXANDRE F. BANNIKOV - DAVID R. BELLWOOD
RENEMA W., BELLWOOD D.R., BRAGA J.C.,
BROMFIELD K., HALL R., JOHNSON K.G.,
LUNT P., MEYER C.P., MCMONAGLE L.B., MOR-
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A   
ALEXANDRE F. BANNIKOV
Borisyak Paleontological Institute of the Russian Acad-
emy of Sciences
Profsoyuznaya 
Moscow 
Russia
e-mail: aban@paleo.ru
DAVID R. BELLWOOD
School of Marine and Tropical Biology and ARC Cen-
tre of Excellence for Coral Reef Studies
James Cook University
Townsville, Queensland 
Australia
e-mail: david.bellwood@jcu.edu.au
Table 1. Meristic values of Recent Pomacentridae.
Values drawn from Leis and Rennis (), Allen (),
Fitzpatrick () and Allen and Erdman (). Num-
bers refer to the number of species examined, numbers
in parentheses refers to the number of species for super-
aneurals in Fitzpatrick ().
Genus Dorsal n Anal Fin Vertebrae Supraneurals n
Abudefduf XIII, 11-17 II, 10-15 3 18 (4)
Acanthochromis XVII, 14-16 II, 14-16 2 1 (1)
Altrichthys XIV, 12-14 II, 14-15 2
Amblyglyphidodon XI-XIV, 10-16 II, 11-15 3 10 (2)
Amblypomacentrus XIII, 10-12 II, 11-13 2
Amphiprion VIII-XI, 13-20 II, 11-15 11 + 15 = 26 3 27 (3)
Azurina XII-XIII, 10-12 II, 11-13 2
Cheiloprion XIII, 13-14 II, 13-14 1
Chromis XII-XV, 9-15 II, 9-16 11 + 15 = 26 3 88 (6)
Chrysiptera XI-XIV, 9-15 II, 10-16 3 32 (3)
Dascyllus XII, 11-16 II, 11-16 3 9 (3)
Dischistodus XIII, 13-16 II, 13-16 3 6 (2)
Hemiglyphidodon XIII, 13-15 II, 13-15 1
Hypsypops XII, 16-17 II, 13-14 1
Lepidozygus XII, 14-15 II, 15-16 11 + 15 = 26 3 1 (1)
Mecaenichthys XIII, 16-17 II, 14 1
Microspathodon XII, 14-17 II, 12-14 3
Neoglyphidodon XIII-XIV, 12-16 II, 12-15 3 9 (1)
Neopomacentrus XIII, 10-13 II, 10-14 3 15 (2)
Nexilosus XIII, 17-19 II, 13-14 1
Parma XIII-XIV, 16-21 II, 13-16 10
Plectroglyphidodon XII-XIII, 14-20 II, 11-18 3 9 (1)
Pomacentrus XIII-XV, 12-16 II, 12-17 11 + 15 = 26 3 62
Pomachromis XIV, 12-14 II, 12-13 4
Premnas IX-X, 16-19 II, 13-15 2 1 (1)
Pristotis XIII, 12-13 II, 12-14 11 + 15 = 26 2
Similparma XIII, 17-18 II, 14 1
Stegastes XII-XIV, 12-17 II, 11-15 3 33 (1)
Teixeirichthys XIII, 11-13 II, 13 1
... Currently, there are over 400 recognized damselfish species, classified in a single family, Pomacentridae, and divided among 29 genera (Fricke et al., 2020), with new species regularly being described (e.g., Allen and Erdmann, 2020;Habib et al., 2020;Shepherd et al., 2020). The oldest record of a pomacentrid is from the Paleocene (Cantalice et al., 2020), but members of the family are relatively uncommon in the fossil record (Bellwood, 1996;Bellwood and Sorbini, 1996;Bannikov and Bellwood, 2014;Cooper and Santini, 2016). Pomacentrids are generally small-to medium-sized, with most species rarely exceeding 100-150 mm standard length (SL), though some genera (e.g., Hypsypops, Nexilosus) can grow larger in size (.250 mm SL; Allen, 1991). ...
... The first character, also called the ceratomandibular ligament, has been proposed as a ''key innovation'' that has contributed to the evolutionary success of the Pomacentridae (Olivier et al., , 2016. The presence of only two anal-fin spines (i.e., first anal-fin pterygiophore with two supernumerary spines and one serially associated soft ray) has a long history in the literature as a diagnostic character for the family: Bleeker (1877); Jordan and Evermann (1898); Fowler and Bean (1928); de Beaufort (1940); Smith (1960); Woods and Schultz (1960); Taylor (1964); Munro (1967); Allen (1975aAllen ( , 1991; Nelson (1994Nelson ( , 2006; Bellwood and Sorbini (1996); Bannikov and Bellwood (2014); Cooper and Santini (2016); Nelson et al. (2016). ...
... Based on available surveys of the ceratomandibular ligament and its insertion on the lower jaw, the presence of this ligament and the position of its insertion (superior to quadrate-angular articulation) appear to be unique to members of the family (Stiassny, 1981;Frédérich et al., 2014;Olivier et al., 2016). Possession of two supernumerary spines in association with the first anal-fin pterygiophore (i.e., two anal-fin spines) appears to be distinctive for the family, which conforms to its long history as a diagnostic character and/or synapomorphy for the group (e.g., Bleeker, 1877;Jordan and Evermann, 1898;Fowler and Bean, 1928;de Beaufort, 1940;Smith, 1960;Woods and Schultz, 1960;Taylor, 1964;Munro, 1967;Allen, 1975aAllen, , 1991Fitzpatrick, 1992;Nelson, 1994Nelson, , 2006Bellwood and Sorbini, 1996;Bannikov and Bellwood, 2014;Cooper and Santini, 2016;Nelson et al., 2016). However, Bellwood and Sorbini (1996) cautioned against assuming the derived nature of this character without a clear understanding of the sister-group relationships of Pomacentridae. ...
... The Neogene record contains reports from the Pliocene of Algeria, and the Miocene of Ecuador, Italy, and Japan (Carnevale and Landini, 2000;Böhme and Ilg, 2003). The Paleogene record is based on three wellpreserved taxa from the iconic Eocene site of "La Pesciara" in the hills north of Verona, Italy (Bellwood and Sorbini, 1996;Bellwood, 1999;Bannikov and Bellwood, 2014). These species marked the earliest record of the family; a pattern that is widespread in coral reef fish families (Bellwood, 1995;Bellwood et al., 2019;Carnevale et al., 2014). ...
... Terminology follows general percomorph and pomacentrid osteological descriptions (e.g. Emery, 1973;Allen, 1975Allen, , 1991Ahlstrom et al., 1976;Emery and Allen, 1980;Frédérich et al., 2008;Bannikov and Bellwood, 2014;Aguilar-Medrano et al., 2011Frédérich and Parmentier, 2016;Yoshigou, 2017). ...
... Nevertheless, this species presents two unsegmented spines on the anal fin in a supernumerary association (i.e. both on the first pterygiophore). This condition is only found in one pharyngognath percomorph family: the Pomacentridae (Bellwood and Sorbini, 1996;Bannikov and Bellwood, 2014). ...
Article
We describe a new fossil fish, †Chaychanus gonzalezorum gen. et sp. nov., from the Belisario Dominguez quarry, a marine Paleocene outcrop of Chiapas, Southeastern Mexico. The single articulated specimen is placed in the family Pomacentridae based on its pharyngognathy and the presence of two anal fin spines in supernumerary association. At approximately 63 Ma, this is the earliest record of the family. The presence of three supraneural with the predorsal formula 0 + 0/0/1 + 1/combined with several diagnostic features indicates this fossil fish as a new genus and species of damselfish. Following the discovery of ancient taxa belonging to †Eekaulostomidae and Serranidae, this the third percomorph family with possible coral reef associations to be described from these marine deposits. Its presence on the Western margin of the Tethys region highlights the importance of the Western Atlantic in the early origins of tropical marine taxa.
... Of the fishes with pharyngeal jaws, except for discoveries of fragmentary remains (pharyngeal jaws) elsewhere, the Bolca fish fauna establishes the earliest known record of the Pharyngognathi or Labroidei. After an extensive study of the Bolca pharyngognath fishes spanning more than 25 years (BELLWOOD, 1991(BELLWOOD, , 1995(BELLWOOD, , 1999SORBINI et al., 1991;BANNIKOV and SORBINI, 1991;BELLWOOD and SORBINI, 1996;BAN-NIKOV, 2004b;BANNIKOV andCARNEVALE, 2010, 2012;BANNIKOV and BELLWOOD, 2014) (see overview in BANNIKOV and BELLWOOD, 2015), the latest lists of the Monte Bolca fishes (BANNIKOV, 2014;CARNEV-ALE et al., 2014) include nine monotypic pharyngognath taxa: three Labridae (Phyllopharyngodon BELLWOOD, 1991, Eocoris BANNIKOV et SORBINI, 1991and Bellwoodilabrus BANNIKOV et CARNEVALE, 2010, three Pomacentridae (Palaeopomacentrus BELLWOOD et SORBINI, 1996, Lorenzichthys BELLWOOD, 1999and Sorbinichromis BANNIKOV et BELLWOOD, 2014, and a number of taxa of incertae sedis including Tortonesia SORBINI, 1983, Sorbinia BELLWOOD, 1995, and Quasicichla BANNIKOV, 2004. Most recently BANNIKOV and BELLWOOD (2015 added one more labrid taxon, Labrobolcus giorgioi, to the list, bringing the total number of Labridae to four. ...
... Of the fishes with pharyngeal jaws, except for discoveries of fragmentary remains (pharyngeal jaws) elsewhere, the Bolca fish fauna establishes the earliest known record of the Pharyngognathi or Labroidei. After an extensive study of the Bolca pharyngognath fishes spanning more than 25 years (BELLWOOD, 1991(BELLWOOD, , 1995(BELLWOOD, , 1999SORBINI et al., 1991;BANNIKOV and SORBINI, 1991;BELLWOOD and SORBINI, 1996;BAN-NIKOV, 2004b;BANNIKOV andCARNEVALE, 2010, 2012;BANNIKOV and BELLWOOD, 2014) (see overview in BANNIKOV and BELLWOOD, 2015), the latest lists of the Monte Bolca fishes (BANNIKOV, 2014;CARNEV-ALE et al., 2014) include nine monotypic pharyngognath taxa: three Labridae (Phyllopharyngodon BELLWOOD, 1991, Eocoris BANNIKOV et SORBINI, 1991and Bellwoodilabrus BANNIKOV et CARNEVALE, 2010, three Pomacentridae (Palaeopomacentrus BELLWOOD et SORBINI, 1996, Lorenzichthys BELLWOOD, 1999and Sorbinichromis BANNIKOV et BELLWOOD, 2014, and a number of taxa of incertae sedis including Tortonesia SORBINI, 1983, Sorbinia BELLWOOD, 1995, and Quasicichla BANNIKOV, 2004. Most recently BANNIKOV and BELLWOOD (2015 added one more labrid taxon, Labrobolcus giorgioi, to the list, bringing the total number of Labridae to four. ...
... It is also consistent with the suggestions that the coral-bearing hardgrounds around Bolca were typical of early Eocene reefs, with limited reefal development, reefs at this time being limited to coral growing on outcrops or boulder-sized bioherms (BELLWOOD et al., 2017). All other Bolca labroids have morphological features including low aspect ratio pectoral fins that are indicative of relatively sheltered water and/or a close association with the benthos (BELLWOOD and WAINWRIGHT, 2001;BANNIKOV and BELLWOOD, 2015). Zorzinilabrus is one of the first labroids with a caudal fin that is indicative of higher mobility. ...
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A new genus and species of labroid fish, Zorzinilabrus furcatus (family Labridae) is described based on a single skeleton from the Eocene locality Bolca in northern Italy. Zorzinilabrus gen. nov. is characterized by a unique mosaic of characters , including labrid synapomorphies (such as a single supraneural, oligomerization of the caudal skeleton and pharyn-gognathy) and features plesiomorphic for labrids (two supernumerary dorsal-fin spines and forked caudal fin with numerous procurrent rays). In some characters Zorzinilabrus gen. nov. differs from the known Labridae, having very slender and flexible unpaired-fin spines (vs. stronger spines in labrids), as few as seven dorsal and two anal-fin spines (vs. not less than eight dorsal and three anal-fin spines in labrids), four anal-fin pterygiophores placed anterior to the second haemal spine (vs. two anal-fin pterygiophores anterior to the second haemal spine in labrids). In these characters Zorzinilabrus gen. nov. resembles basal labroids from Monte Bolca such as Tortonesia (Tortonesidae). Zorzinilabrus appears to represent the earliest branching lineage within the Labridae. A functional interpretation of the morphology of Zorzinilabrus, including the unusual forked caudal fin, suggests that Zorzinilabrus fed on plankton away from reefs or hardgrounds. This is the earliest record of planktivory within the Labroidei s.s. or Labridae.
... In spite of a long evolutionary history that dates back to the early Neogene (Cowman and Bellwood 2012, Frédérich et al. 2013, Near et al. 2013, damselfi shes have a relatively scarce fossil record, which is currently limited to 6 described taxa. The known pomacentrid fossil record was reviewed by Bellwood and Sorbini (1996), Bellwood (1999), Carnevale and Landini (2000) and Bannikov and Bellwood (2014). The brief review included here will rely heavily upon their fi ndings and conclusions. ...
... The oldest fossils that can unquestionably be assigned to the family Pomacentridae are Palaeopomacentrus orphae Bellwood and Sorbini (1996), Lorenzichthys olihan Bellwood (1999), and Sorbinichromis francescoi Bannikov and Bellwood (2014). All three taxa are from the Ypresian deposits of Monte Bolca (Middle Eocene, 50 Ma; Bellwood and Sorbini 1996, Bellwood 1999, Bannikov and Bellwood 2014, Carnevale et al. 2014. ...
... The oldest fossils that can unquestionably be assigned to the family Pomacentridae are Palaeopomacentrus orphae Bellwood and Sorbini (1996), Lorenzichthys olihan Bellwood (1999), and Sorbinichromis francescoi Bannikov and Bellwood (2014). All three taxa are from the Ypresian deposits of Monte Bolca (Middle Eocene, 50 Ma; Bellwood and Sorbini 1996, Bellwood 1999, Bannikov and Bellwood 2014, Carnevale et al. 2014. ...
... In extant fishes, it appears that one of the key adaptations that underpinned effective colonization of the reef flat was labriform locomotion using high-aspect-ratio pectoral fins Fulton, Bellwood, & Wainwright, 2001;Fulton et al., 2017). Fossil evidence indicates that early labrids all had low-aspect-ratio fins (Bannikov & Bellwood, 2015), while phylogenetic evidence indicates that fish groups with high-aspectratio fins probably arose in the Miocene, in both the Labridae and Acanthuridae Cowman, Bellwood, & van Herwerden, 2009;Sorenson, Santini, Carnevale, & Alfaro, 2013). ...
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The published fossil record of the Labridae is critically evaluated. In total, fossils from 14 genera are provisionally placed within the family (the Scaridae is recognized as a tribe Scarini within the Labridae). Numerous specimens, previously recorded as Labridae, are now placed within other families, most notably the Phyllodontidae (Elopiformes). The labrid tribe Hypsigeniyni is characterized by the possession of an unusual, derived, phyllodont dentition in the pharyngeal bones. Fossils of this clade are particularly abundant, especially specimens in the genus Labrodon. This material permitted a reconstruction of the biogeography of the Hypsigenyini from its earliest record in the Eocene of Monte Bolca in Italy (Phyllopharyngodon), before extending across the central Tethys in the late Eocene (Labrodon), and from the New World to Europe, Sri Lanka, and New Zealand in the Miocene (Labrodon). The biogeographic expansion of the Hypsigenyini in the fossil record strongly supports inferences from recent molecular phylogenetic evidence.
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Four genera of fossil siganid fishes of early Eocene to early Oligocene age are recognized in addition to the single Recent genus. The osteological features of these five genera are described and illustrated. A phylogenetic analysis utilizing PAUP indicates that the genera have the following phyletic sequence convention: Ruffoichthys Sorbini (two species from the middle Eocene of Italy)—Eosiganus, new genus (one new species from the middle Eocene of Russia)—Siganopygaeus Danilchenko (one species from the early Eocene of Turkmenistan)—Protosiganus Whitley (one species from the early Oligocene of Switzerland)—Siganus Forsskal (27 Recent species in the Indo-Pacific).
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Spiny-rayed fishes, or acanthomorphs, comprise nearly one-third of all living vertebrates. Despite their dominant role in aquatic ecosystems, the evolutionary history and tempo of acanthomorph diversification is poorly understood. We investigate the pattern of lineage diversification in acanthomorphs by using a well-resolved time-calibrated phylogeny inferred from a nuclear gene supermatrix that includes 520 acanthomorph species and 37 fossil age constraints. This phylogeny provides resolution for what has been classically referred to as the "bush at the top" of the teleost tree, and indicates acanthomorphs originated in the Early Cretaceous. Paleontological evidence suggests acanthomorphs exhibit a pulse of morphological diversification following the end Cretaceous mass extinction; however, the role of this event on the accumulation of living acanthomorph diversity remains unclear. Lineage diversification rates through time exhibit no shifts associated with the end Cretaceous mass extinction, but there is a global decrease in lineage diversification rates 50 Ma that occurs during a period when morphological disparity among fossil acanthomorphs increases sharply. Analysis of clade-specific shifts in diversification rates reveal that the hyperdiversity of living acanthomorphs is highlighted by several rapidly radiating lineages including tunas, gobies, blennies, snailfishes, and Afro-American cichlids. These lineages with high diversification rates are not associated with a single habitat type, such as coral reefs, indicating there is no single explanation for the success of acanthomorphs, as exceptional bouts of diversification have occurred across a wide array of marine and freshwater habitats.
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The fish assemblage from the Eocene deposits of Monte Bolca, Northern Italy, are compared with those of Recent coral reefs. A family-level taxonomic definition of a Recent coral reef fish assemblage is formulated to permit direct comparisons. On this basis, the Monte Bolca fishes represent the earliest clearly defined coral reef fish assemblage. Quantitative analyses of the relative abundance of fish families revealed significant differences between the two assemblages. The Bolca assemblage has Mesozoic links (Pycnodontiformes) and non-perciform taxa are relatively abundant, particularly the Beryciformes (Holocentridae). However, Bolca represents the earliest record of a perciform-dominated benthic fish assemblage (68.4% of all non-clupeid taxa). Within the Perciformes, the abundance of the major reef fish lineages (higher squamipinnes and Labroidei) differs markedly between the two assemblages. The numerical dominance of labroid fishes on coral reefs appears to have been a relatively recent occurrence.
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Hotspots of high species diversity are a prominent feature of modern global biodiversity patterns. Fossil and molecular evidence is starting to reveal the history of these hotspots. There have been at least three marine biodiversity hotspots during the past 50 million years. They have moved across almost half the globe, with their timing and locations coinciding with major tectonic events. The birth and death of successive hotspots highlights the link between environmental change and biodiversity patterns. The antiquity of the taxa in the modern Indo-Australian Archipelago hotspot emphasizes the role of pre-Pleistocene events in shaping modern diversity patterns.
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Aim To use recently published phylogenies of three major reef fish families to explore global patterns of species origin and dispersal over the past 65 million years. The key questions are: when and where did reef fishes arise, and how has this shaped current biodiversity patterns? Location Biogeographic reconstructions were performed on globally distributed reef fish lineages. Patterns of lineage origination and dispersal were explored in five major biogeographic regions: the East P acific, the A tlantic, the I ndian O cean, the I ndo‐ A ustralian A rchipelago hotspot, and the C entral P acific. Methods A dispersal, extinction and cladogenesis ( DEC ) model implemented in Lagrange was used to infer the most likely biogeographic scenarios at nodes on chronograms of three diverse reef fish families ( L abridae, P omacentridae, C haetodontidae). For the terminal branches ANOVA was used to compare patterns of origination on a regional and global scale. Patterns of origination and dispersal were examined within discrete time periods for the five biogeographic regions. Results Temporal examination of hypothetical ancestral lineages reveal a pattern of increasing isolation of the East P acific and A tlantic regions from the E ocene, and the changing role of the I ndo‐ A ustralian A rchipelago from a location of accumulating ranges in the P alaeo/ E ocene, a centre of origination in the M iocene, to extensive expansion of lineages into adjacent regions from the P liocene to Recent. Main conclusions While the East P acific and A tlantic have a history of isolation, the I ndo‐ A ustralian A rchipelago has a history of connectivity. It has sequentially and then simultaneously acted as a centre of accumulation ( P alaeocene/ E ocene onwards), survival ( E ocene/ O ligocene onwards), origin ( M iocene onwards), and export ( P liocene/Recent) for reef fishes. The model suggests that it was the proliferation and expansion of lineages in the I ndo‐ A ustralian A rchipelago (the C oral T riangle) during the M iocene that underpinned the current biodiversity in the I ndian and P acific O ceans.
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The fossil record of the Pomacentridae has been based on species from six genera. The status of these taxa is reviewed. Only two are tentatively accepted as belonging to the Pomacentridae: Chromis savomini from the Miocene of Algeria and Izuus nakamurai from the Miocene of Japan. In addition, a new genus and species Palaeopomacentrus orphae is described from the lower Middle Eocene of Monte Bolca, Northern Italy. This is the first substantiated record of a pomacentrid from the Eocene, and represents the oldest record of the family.
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Diversification rates within four conspicuous coral reef fish families (Labridae, Chaetodontidae, Pomacentridae and Apogonidae) were estimated using Bayesian inference. Lineage through time plots revealed a possible late Eocene/early Oligocene cryptic extinction event coinciding with the collapse of the ancestral Tethyan/Arabian hotspot. Rates of diversification analysis revealed elevated cladogenesis in all families in the Oligocene/Miocene. Throughout the Miocene, lineages with a high percentage of coral reef-associated taxa display significantly higher net diversification rates than expected. The development of a complex mosaic of reef habitats in the Indo-Australian Archipelago (IAA) during the Oligocene/Miocene appears to have been a significant driver of cladogenesis. Patterns of diversification suggest that coral reefs acted as a refuge from high extinction, as reef taxa are able to sustain diversification at high extinction rates. The IAA appears to support both cladogenesis and survival in associated lineages, laying the foundation for the recent IAA marine biodiversity hotspot.
Phylogeny of the Epinephelidae (Teleostei: Serranidae) Eocottidae, a new family of perciform fishes (Teleostei) from the Eocene of northern Italy (Bolca) Fishes from the Eocene of Bolca, northern Italy, previously classified with the Chaetodontidae (Perciformes)
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ALLEN G.R., ERDMANN M.V. 2012. Reef fishes of the East Indies. University of Hawai'i Press, Honolulu: 1292 pp. BALDWIN C.C., JOHNSON G.D., 1993. Phylogeny of the Epinephelidae (Teleostei: Serranidae). Bulletin of Marine Science 52 (1): 240-283. BANNIKOV A.F., 2004a. Eocottidae, a new family of perciform fishes (Teleostei) from the Eocene of northern Italy (Bolca). Miscellanea Paleontologica n. 7. Studi e Ricerche sui Giacimenti Terziari di Bolca, 10: 17-35. BANNIKOV A.F., 2004b. Fishes from the Eocene of Bolca, northern Italy, previously classified with the Chaetodontidae (Perciformes). Miscellanea Paleontologica n. 7. Studi e Ricerche sui Giacimenti Terziari di Bolca, 10: 55-74. BANNIKOV A.F., 2008. Two new genera for long known percoid fishes (Perciformes) from the Eocene of Bolca, Italy. Miscellanea Paleontologica n. 9. Studi e Ricerche sui Giacimenti Terziari di Bolca, 12: 29-44.