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Deep-Seg
['auna and Pollutants in Nansei Islands, cdited by K. Hascgarva.
Ci. Shinohara and M. Takcda
pp.2lt9 295. National Science
Muscum Monographs.
No.29.
Tokyo, 2005
A New Crab Species of the Genus Mursia from Japanese Waters
(Crustacea, Decapoda, Brachyura, Calappidae)
Masatsune
Takedal and Bella S. Galil'
'Department
of Zoology, National Science
Muscum,
Tokyo
3 23 | Hyakunincho, Shinjuku-ku,
Tokyo I69 0073, Japan
c-mail:
takeda @ kahaku.go.jp
'National Institute of Oceanography,
lsrael Oceanographic
and
Limnological
Research. P.O.B. 8030,
Haifa 31080,
Israel
e-mail: bclla
(4
ocean.ors.il
Abstract: A ncrv
species.
Mursia orientalia,
is
describcd
liom the spccimcns collected
tiom Japancsc
waters at depths
of 36 214 rn. It resembles
M. australiensis
Campbell.
197 I, in gcneral
body shape
and cctarse
granulation
on the dorsal surface
ofthe carapace. but ditfcrs
from the lattcr
in its larger
size.
the abdominal
crest comprising
ol'subquadrate
lateral lobes and
triangular mcdian
lobe rathcr
than three subequal
rounded lobes. thc second malc plcopod distally crook-shaped
rathcr than
sinuous. and the epistorle
bcaring
two rather than
four red
dots.
Also,
comparison
rvith
sonle
othcr
spccics
is rnade.
Key words: Calapprdtc.
Mursia. new spccics, Japanese
watcrs,
F-ast China Sea, South China Sca
Introduction
While we
described
some
new Mursia species
lrom the Philippines
(Galil & Takeda,
2004), the Japanese
Mursia species
in the collections of the National Science
Museum.
Tokyo,
were re-examined
following the contribution by Galil
(1993).
The
results revealed
the
presence
of a new
species
among the
misidentilied or unidentified specimens
from the
Pacific coast
of Japan and the East China Sea.
In the followin-q
pages,
the new species.
M. orientalia,
is described,
photographed
and illustrated.
ln thc following description,
the carapace
length
measured along the
vertical median
line of the carapace
is abbreviated
as CL.
Mursia orientalia sp. nov.
(Figs.
l-4)
Mursia asperu.
Miyakc, l9tt3.
pp.24,
199.
p1.8.
f i-u.5.
Mursia utrtispina: Ttkeda, 1995,
p. 138
(in list); C'hcn & Sun.
2002.
p.491
,l'i,c..221
.
Mursia trispino.ra:
Takeda & Kubodcra. 1998.
p.213
(part);
Takeda.200l,
p.231
(patt).
Mursia danigoi: Takeda. 2001.
p.231
(patt).
Mursia nticrospriia:
Takcda. 2001.
p.23
1
(patt).
Type series.
Holotype. East China Sea, & (CL 20.2mm), NSMT-Cr 13746,
R/V
Kumqmoto-Maru
stn
K-047
(32'06.78'N,
121'45.93'E),
138 139 m deep,
I June,
2000.
Paratypes.
East
China Sea-lJ (CL l0.5mm).
l+ (CL l6.0mm),
NSMT-Cr'
13745. R/V Kumamoto-Maru stn
K-066
(32'21.94'N,
121"45.13'E),
146
m deep,
l7 June.
2000:
4 A (CL 13.8 l8.6mm).
I +, NSMT-Cr l3741,RfY Kumantoto-Maru stn
K-059
290 Masatsune Takcda and Bella S. Galil
Fie.1. Mu$ia o entalia i. sp-.
paratype
femalc
(NSMT-Cr I2207; CL l5.0mm) ftom lhc East
China
Sea.
201-214m deep,
recorded by Takeda & Kubodera
(1998)
as M. trbpinosa Parisi
(Courtesy
of
Dr. T. Kubodefal.
(31'40.16'N,
127'38.04'E), 133
137 m deep.
20 June. 2000; I I (CL 14.7 mm), NSMT-CI
13144, R/V Kumamoto-Maru stn K-047,
(26"45.41'N,
125"06.01'8,
138-139 m deep),
I
June,
2000; 1 + (CL 15.5
mm), NSMT-CI l22l1, R/V Yoko-Maru
stn
T-15
(29'24.3'N,
121"16.5'E 29'21.8'N,
121"15.4'E), 170m deep, 29 Septempber,
1997, coll. by T.
Kubodera, recorded by Takeda & Kubodera
(1998)
as
M. trispinosa Parisi; I + (CL 16.1
mm), NSMT-Cr 12201,
R/V Yoko-Maru stn T-16
(29'19.7'N
, 12'7" 15.6'E 29'11.3'N.127"
14.4'E), 201 214
m deep,
29
September,
1997, coll. by T. Kubodera, recorded by Takeda
& Kubodera
(1998)
as
M. trispinosa Parisi; I I (CL I1.0 mm), NSMT-Cr 15043,
R/V
yoko-Maru
stn
T04
(32'06.06'N,
127"56.38'E 32'04.44'N,
126'55.12'E), 147 1,19
m deep,
l3 October,
2001,
coll. by G. Shinohara
& H. Saito.
Tosa Bay-a f (CL I4.5 15.5
mm).
NSMT-Cr 12281, R/V Kotaka-Maru stn K97-8-125
(33'16.5'N,
133'34.5'E 33"16.0'N,
133'34.2'E),
124-125m
deep,
20 August, 1997,
recorded by Takeda
(2001)
as
M. danigoi
Galil; 1
d (CL 15.5 mm), I I (CL 14.7
mm), NSMT-Cr 12290, R/V Kotaka-Maru stn
K97-5-200
(33'13.4'N,
133"36.0'E 33'13.1'N,
133'35.5'E), 196 198 m deep, l6 May, 1997,
recorded
by
Takeda
(2001)
as M. trispinosa
Parisi; ? ciz
(CL 10.5 16.8
mm), 5 + (CL 14.7
18.2
mm), NSMT-CI 12291,
R/y Kotaka-Maru
stn
K97-8-150
(33'13.7'N,
133'34.8'E
33"13.4'N,
133'34.3'E), l53m deep,20 August,
1997, recorded by Takeda
(2001)
as M.
trispinosa Parisi; I d (CL 20.5
mm), NSMT-CI 13973, R/V Kotaka-Maru
stn
K97-5-125
(33'17.0'N,
133'35.1'E 33'16.6'N,
133'34.9'E), 125 l26m deep, l4 May, 1997, recorded
by Takeda
(2001)
as
M. danigoi Galil. Off Izu Islands I d (CL 10.5 mm), NSMT-Cr
6940, R/V Soyo-Maru stn 53, 160
m deep,
5 March, 1968, col1. by T. Okutani.
Onagawa
Bay 1 ovig. + (CL 15.8
mm), NSMT-CI ll57l, recorded by Takeda
(1995)
as M.
curtispina Mjers, T/v Suikoku stn
7 (38"25'05"N,
141"30'02E
- 38'25'12"N, 141"29'98"
E), 36 m deep,
26
September,
1994, coll. by M. Takeda,
recorded
by Takeda
(1995)
as
M.
curtispina Miers.
Descfiption.
Carapace
transversely subovate
in shape,
convex, 1.2 wide as long.
Dorsal surface covered
with closely-packed
perliform granules
diminishing
in size
anter-
Nc$ a rab o1 ,Ulrrla tlom .ldprnese Wxte6 l9l
Fig.2. Mutsio ori(ntaltu
r. sp..l1elt'\ypc
malc
((lL 20.2 mrn; NSMI-Clr1i746) liom lhc ErLsl
('hina Se.t
in dorsrl \ie$ (C).
A, D,,ishr lhcla
in lwo different
!iews.
292 Masatsune Takeda and Bclla S. Galil
Fig.3. First (A) and second
(B, C) pleopods
of Mursia orientaliq n.sp., holotype
male
(CL 20.2mm;
NSMT-Cr13746)
from the East
China Sea.
Scale bar: I mm.
iorly and
posteriorly.
Granular
protuberances,
diminishing
in size
posteriorly,
disposed
in
seven
radial rows on dorsal surface of carapace. Mesogastric region highest part of
carapace. Gastric, cardiac and intestinal regions separated
from branchial regions by
shallow, sinuous
longitudinal
grooves.
Anterolateral
margin
arcuate, bearing beaded
line
superimposed on nine tubercles,
successively smaller anteriorly and posteriorly. Lateral
spine acuminate, slightly upcurved,
one fifth carapace width, dorsally
granulate.
Postero-
lateral margins oblique, sharply convergent,
beaded
line angled medially. Posterior
margin beaded, lateral teeth triangular, dorsoventrally flattened, median lobe nearly
obsolescent.
Frontal margin
projecting
beyond orbits, trilobate, median lobe broadly triangular,
at lower plane than lateral lobes; lateral lobes rounded, separated
from supraorbital
margin by shallow concavity. Antennules
obliquely folded.
Supraorbital
margin unifis-
sured,
minutely granulate,
bearing
long plumose
setae.
Inner orbital tooth separated
from
outer orbital margin
by deep
U-shaped
cleft, and from front by orbital hiatus. Antennae
small, slender,
basal segment subrectangular, lodged in orbital hiatus.
Eyes retractable,
eyestalk short,
granulate,
setose.
Buccal
frame rhomboidal, narrowing anteriorly. Thick
fringe
of plumose
setae
running
the
length
of third maxilliped
exopod, merus and ischium
granulate,
bearing short setae. Subhepatic region densely setose.
Sternum minutely
granulose.
Male abdomen with segments 3 5 fused; trilobate carina on second segment,
prominent subquadrate
lateral lobes separated by wide V-shaped
clefts
from triangular
median lobe; sixth abdominal segment
subquadrate,
lateral
margins
sinuous.
Chelipeds massive,
granulate.
Merus distally trispinose,
distal spine
longer,
stouter
than subdistal spine. Anterior margin
of carpus
ending
in a triangular
denticle.
External
surface of chela convex, upper margin
crested,
setose.
Larger
(right)
chela bearing
dorsal
Ncw CrNb of,rrlrrrr ftom Japancsc Watem )91
Ftg.4. Mutsid orientdlia i. sp.,
pafat)-pe (CL l6.8nrm; NSMI ( r ll29l) f.om Tos.r llt|). A. B.
dorsal
and frontxl vie$,s.
crest with eight denticles:
first tooth low, teeth 2 4 triangular, successive teeth
progressive-
ly lowcr and wider. External
surface
with nine granulate
tubercles in three oblique rows,
and 1$'o tubcrcles near base of crest; ploximal tubercle in inf'erior rorv spinose, slightly
upcurved, median rnd distal lubercles dentifo|rr, triangular, djstal tubercle smallest.
lntelnal surfacc
with sctosc band near Jower margin. Lower margitr seffate, serrttions
successively smaller proximally. Upper margin of dactylus crested, setose,
granulated
proximally; with curved roundcd tooth proximally fitting ioto depression fbrmed
between two molarilbrm teeth in pollex:
inner
surlace bearing stlidulating
ridge
consist-
irrg of 28 striae. Smaller chela lacks the large dactylar toolh. Pereiopods 2 5 slender,
laterally compressed, upper and lower malgin minutcly granulate; upper margin of
carpus distally spinose; dactylus slender. longer than propodus,
styliform.
First rnale
pleopod tapering evenly. curved.
distally spinulosc.
Sccond
rnalc
plcopod
294 Mlsatsune
Tukcda
and tsclla S. Cialil
long,
slender,
cornute,
distal
portion crook-shaped,
tip twisted
inwards, upcurved.
Color.
ln the
preserved material the epistome
bears
bright-red dots
on each
side
of the
eff'erent
channel.
Internal surface
of palm with small orange
patch distally,
near the
articulation
with the dactylus.
One
of the photographs
of fiesh specimens
from the East
China Sea
was
reproduced
herein.
Etymology.
The name alludes
to the distribution
in Japanese
waters'
Remarks. Mursia orientalia resembles
M. qustraliersls
Campbell. 1971,
in general
body shape
and coarse
granulation
on the dorsal
surface
ofthe carapace,
but differs
from
the latter
in its larger size,
the abdominal
crest
comprising
of subquadrate
lateral
lobes
and triangular
median
lobe rather than three subequal
rounded
Iobes,
the second
male
pleopod
distally
crook-shaped
rather than sinuous,
the epistome
bearing
two rather tharl
four red dots.
As seen
in Fig.4, the smaller specimens
are
generally
close to M. trispinosa
Parisi.
but
the carapace
is
covered
with coarser
granules
and
three tubercles
on the
cheliped
palm
are
more or less tuberculated,
not much different
in size,
and independent
to each other.
Distribution.
Pacilic
coast of Japan.
and
the East and South
China Seas.
I33 184m.
General notes on the Mursiu species
from Japanese
waters
In his monograph
on the Japanese
crabs, Sakai
(1916)
listed Mursia
armata de
Haan,
1837,
M. curtispina
Miers, 1886,
M. crutispina
trispinosa
Parisi, 1914,
M. aspera
Alcock.
1899.
and M. curtispina
hawaiiensis
Rathbun, 1893.
However, Galil (1993)
revised the
genus
based
on the worldwide many specimens
and mentioned some notes on the
identification as
follows.
Mursia armata curtispina
recorded by Yokoya (1933)
and Sakai (1937)
is really
ref'erred to M. trispinosa
Parisi.
The species
described
and depicted
by Sakai
(1965;
1976)
differs
from M. curtispina
in having
longer spines
laterally on the carapace
and distally
on the cheliped
merus,
in the
form of inferior
tubercles externally
in the
palm
and
in the
shape
of the color patch
on the inner
palmer face. The validity
of M. curtispina
reported
by Takeda and Koyama (1914)
is also uncertain.
As a result,
M. curtispina
is to be
excluded
from the Japanese
carcinological
fauna.
Mursia aspero
recorded by Sakai (1965; 1976)
also differs from true M. aspera
rn
having
more
prominent medial
tubercles on the external surface
ol'the
chela and
a longer
lateral
spine.
A specimen
depicted
by
Miyake
(1983)
is said by Galil (1993)that
it is
quite
similar
to M. au.stralleasls
Campbell,
197
l. in having an even
longer
lateral
spine
and a
thin,
elongate spine
distally
o11 the
nrerus,
while the specimen depicted
by Baba
(1986)
is
to be identified
with M. microspina
Davie
& Short, 1989.
Mursia hawaiiensis
reported
from Japancse
waters by Sakai
(1965;
I976)
and
Takeda
and Koyama (1914) may be also due to misidentification, differing from true M.
hawaiiensis
in having the second
male
pleopod
crook-shaped,
in the
form of the
inferior
tubcrcles
externally
on the palm and in the prominent radial tuberclcs
on the carapiice.
Some
notes on the recent contributions
on the Japanese
Mursia species
are as
follows.
Takeda
(1991)
identif
ied the specimens
from Suruga
Bay with M. danigoi Galil, 1993,
not
with M. curtispina.
Takeda (2001) reported M. microspina
fiom Tosa Bay. As readily
understood
in the paper,
the identification
of the species
is
still confused, chiefly
duc to
the
close similarity
of the immature specimens.
New Crab of Mursia fronr Japanese
Waters
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295
