Tetratoma (Abstrulia) pictipennis New to South Korea (Coleoptera: Tetratomidae), with a Key to Species of the Subgenus Abstrulia

Abstract

The subgenus Abstrulia Casey belonging to the genus Tetratoma Fabricius of the family Tetratomidae is distributed ten species over the Holarctic region, including eight Palaearctic species. In East Asia, four species from Russian Far East and two species from Japan have been recorded, respectively. In the Korean Peninsula, two species, T. (A.) ainu (Nakane) and T. (A.) pictipennis Reitter, were reported up to date, and latter species is newly recorded in South Korea in this paper. A redescription, habitus photograph, and illustrations of diagnostic characters of the species are provided, with a key to species of the subgenus Abstrulia.

Full text

INTRODUCTION
Casey (1900) rst proposed the subgenus Abstrulia belong-
ing to the genus Tetratoma Fabricius, 1790 of the family
Tetratomidae Billberg, 1820 based on Tetratoma tessellate
Melsheimer, 1844. The subgenus Abstrulia is distributed ten
species over the Holarctic region, including eight Palaearctic
species (Nikitsky, 2004, 2008). In East Asia, four species
from Russian Far East and two species from Japan have been
recorded, respectively, but any species have not been reported
from China (Nikitsky, 2008). In the Korean Peninsula, two
species, T. (A.) ainu (Nakane) and T. (A.) pictipennis Reitter,
were reported up to date, and latter species is only distributed
in North Korea.
Most members of Tetratomidae are associated with fresh
or soft fruiting bodies of various wood-rotting fungi, and
their hosts include a variety of Basidiomycetes mainly in the
family Polyporaceae (Lawrence and Leschen, 2010). The
subgenus Abstrulia of genus Tetratoma is hardly known for
biological data, but some Tetratoma species including type
speices, T. (Tetratoma) fungorum Fabricius feeds mainly on
fresh fruiting bodies of Piptoporus betulinus of Polyporaceae
(Lawrence and Leschen, 2010).
While studying diversity of Korean beetle, Tetratoma (Abst-
rulia) pictipennis Reitter is discovered in South Korea for the
rst time. In this paper, we provide a redescription, habitus
photograph and illustrations of diagnostic characters, and also
provide a key to species of the subgenus in order to facilitate
identication of Abstrulia species.
MATERIALS AND METHODS
All Korean specimens examined were collected by using
window trap in Mt. Gamaksan (Gangwon Province) in 2016
and two of which is deposited in the National Institute of
Biological Resources (NIBR), Incheon, Korea.
Habitus photographs were taken using an image process-
ing systems (Leica M205A, Leica DFC495; Leica Microsys-
tems, Wetzlar, Germany) and were merged using an image
stacking software, Combine ZP.
SYSTEMATIC ACCOUNTS
Order Coleoptera Linnaeus, 1758
Family Tetratomidae Billberg, 1820
Genus Tetratoma Fabricius, 1790
Anim. Syst. Evol. Divers. Vol. 38, No. 2: 65-68, April 2022
https://doi.org/10.5635/ASED.2022.38.2.048
Review article
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eISSN 2234-8190
*
To whom correspondence should be addressed
Tel: 82-70-7353-2547, Fax: 82-31-540-8800
E-mail: dosirak09@naver.com
Copyright The Korean Society of Systematic Zoology
Tetratoma
(Abstrulia) pictipennis New to South Korea
(Coleoptera: Tetratomidae), with a Key to Species of
the Subgenus Abstrulia
Seung-Gyu Lee1, Sang-Woo Jung2, Yoon-Ho Kim2,*
1Animal Resources Division, National Institute of Biological Resources, Incheon 22689, Korea
2DASARI Research Institute of BioResources, Daejeon 34116, Korea
ABSTRACT
The subgenus Abstrulia Casey belonging to the genus Tetratoma Fabricius of the family Tetratomidae is distributed
ten species over the Holarctic region, including eight Palaearctic species. In East Asia, four species from Russian
Far East and two species from Japan have been recorded, respectively. In the Korean Peninsula, two species, T. (A.)
ainu (Nakane) and T. (A.) pictipennis Reitter, were reported up to date, and latter species is newly recorded in South
Korea in this paper. A redescription, habitus photograph, and illustrations of diagnostic characters of the species are
provided, with a key to species of the subgenus Abstrulia.
Keywords: Coleoptera, Tetratomidae, Tetratoma (Abstrulia) pictipennis, Korea

Seung-Gyu Lee, Sang-Woo Jung, Yoon-Ho Kim
66 Anim. Syst. Evol. Divers. 38(2), 65-68
Subgenus Abstrulia Casey, 1900
Abstrulia Casey, 1900: 167 (type species: Tetratoma tessellate
Melsheimer, 1844).
Diagnosis. Body setae well-visible on the upperside in dor-
sal aspect; antennomeres 8
-
11 shorter than or about as long
as all preceding ones combined; lateral margins of pronotum
reexed and attened, with minute serration; elytra bicolor,
entirely black to brown, with red or yellow spotty pattern; visi-
ble abdominal sternite I often distinctly longer than II; visible
abdominal V with impression; aedeagus distinctly shorter
than tegmen, parameres very narrowly divided or contiguous
all along inner edge, narrow and pointed at apex (Nikitsky,
1998).
Key to species of the subgenus Abstrulia Casey
(Nikitsky, 2004)
1. Scutellum reddish color; elytra with short and sparse setae
not overlapping each other ·············································· 2
-
Scutellum blackish color; elytra with long and dense setae
overlapping each other ···················································· 3
2. Lateral margin of pronotum narrowly and less-developed,
without angle ····················· Tetratoma (Abstrulia) ancora
-
Lateral margin of pronotum widely and well-developed,
with minutely angle near middle ····················T. (A.) virgo
3. Elytra with prominent seta distinctly distant from surface
························································································ 4
-
Elytra with adjoining seta slightly distant from surface
···· 7
4. Antennomere 3 distinctly long, 1.6
-
1.8 times as long as
4; visible male abdominal ventrite V with relatively weak
groove; aedeagus constrict and abruptly narrow apically ··
······························································ T. (A.) crenicollis
-
Antennomere 3 relatively short, less than 1.6 times as long
as 4; visible male abdominal ventrite V with distinct and
large groove; aedeagus gradually narrow apically ···········5
5. Elytra without apical patterns near elytral suture; elytral
surface with distinctly prominent and long seta, apical
part of seta not bent ······························ T. (A.) canadensis
-
Elytra with small subapcal patterns near elytral suture in
most, connected to preceding patterns in some; elytral
surface with slightly prominent and relatively short seta,
apical part of seta slightly bent ········································ 6
6. Pronotum uneven and slightly serrated in lateral margin;
visible ventrite I of abdomen about 2.0 times as long as
IV ···························································· T. (A.) tesselata
-
Pronotum distinctly serrated in lateral margin; visible
ventrite I of abdomen about 2.0 times less than IV ············
································································ T. (A.) variegata
7. Antennomeres 8
-
11 more than 1.25 times shorter than
preceding all antennomeres combined; elytra more elon-
gate, more than 1.55 times as long as wide ····················· 8
-
Antennomeres 8
-
11 less than 1.25 times shorter than pre-
ceding all antennomeres combined; elytra less elongate,
less than 1.55 times as long as wide ······························10
8. Elytra with apical patterns near elytral suture ··················
········································································ T. (A.) ainu
-
Elytra without apical patterns near elytral suture ··········· 9
9. Body length 2.8
-
3.5 mm; antennomere 11 about 1.5
-
1.7
times as long as 10; pronotum about 1.6
-
1.7 times as
wide as long; posterior patterns not reach to suture and
lateral margin of elytra ····························T. (A.) baudueri
-
Body length about 3.5 mm; Antennomere 11 about 1.8
times as long as 10; pronotum about 1.5 times as wide as
long; posterior patterns reach to suture or lateral margin
of elytra ······················································· T. (A.) tedaldi
10. Anterior patterns of elytra slightly sinuate in posterior
part; antennomere 3 about 1.7
-
2.0 times as long as wide;
antennomere 6 slightly elongate or about as long as wide ·
································································· T. (A.) japonica
-
Anterior patterns of elytra distinctly sinuate in posterior
part; antennomere 3 about 1.4
-
1.6 times as long as wide;
antennomere 6 distinctly transverse ·······T. (A.) pictipennis
1*Tetratoma (Abstrulia) pictipennis Reitter, 1896
(Figs. 1, 2)
Tetratoma pictipennis Reitter, 1896: 237.
Tetratoma (Abstrulia) pictipennis: Nikitsky, 2004: 30.
Material examined. 3 exs., Korea: Gyeonggi-do, Yangju-si,
Nam-myeon, Hwangbang-ri, Mt. Gamaksan, 37°56′00.68″N,
126°58′47.27″E, 13 Aug 2013, Lee SG.
Description. Body (Fig. 1) length about 2.7 mm, entirely
elongate-oval, convex dorso-ventrally; surface glossy, with
dense punctures and light yellow pubescense. Coloration.
Body entirely reddish-black to black; mouthparts, antenno-
meres 1
-
5, pronotal margins and legs reddish yellow; antenno-
meres 6
-
11 dark brown; elytra black with reddish yellow
patterns, anterior patterns distinctly sinuate in posterior part
and connected in median region, medial patterns located in
lateral margins at middle and contiguous to anterior patterns,
posterior patterns separated and distinctly reexed (reinform);
apical patterns contiguous to posterior patterns and connected
near apex of elytral suture. Head (Fig. 2B). Slightly trans-
verse, 1.05
-
1.15 times as wide as long, widest across eyes
and increasingly narrow posteriorly behind eyes; approx-
imately 0.55
-
0.60 times narrower than pronotum; eyes approx-
imately 0.65
-
0.70 times as long as wide, distinctly prominent
laterally and widely separated, distance between eyes approx-
Korean name: 1*날개무늬애버섯벌레붙이

Tetratoma ( Abstrulia) pictipennis New to South Korea
67
Anim. Syst. Evol. Divers. 38(2), 65-68
imately 1.80 times width of eye. Antenna (Fig. 2A) longer
than head width; antennomeres 1
-
3 elongate, antennomere 1
swollen, 3 narrower and shorter than 2, approximately 1.45
times as long as wide, antennomeres 4
-
5 subquadrate, 6
-
7
transverse to distinctly transverse, 8
-
11 clubbed, slightly
shorter than all preceding combined, antennomere 7 distinctly
transverse and approximately 1.85
-
1.90 times as wide as
long, 8 slightly transverse and approximately 1.25
-
1.30 times
as wide as long, antennomeres 9
-
10 approximately 1.40
-
1.50 times as wide as long, antennomere 11 approximately
1.20
-
1.25 times as long as wide and approximately 1.65
-
1.70
times longer than 10. Thorax. Pronotum distinctly transverse,
approximately 1.55
-
1.70 times as wide as long, widest in
basal third; surface with densely granular punctures, relatively
long and light yellow pubescence; anterior angles slightly
round and posterior angles obtuse; lateral margin uneven and
indistinctly serrated. Scutellum transversely shield shape,
approximately 1.35
-
1.50 times as wide as long; surface with
dense punctures, subequal in size of elytral punctures. Elytra
slightly wider than pronotum, approximately 1.55
-
1.70 times
as long as wide, widest near middle; surface with granular
punctures, subequal in size and density of pronotal punctures.
Mesocoxae (Fig. 2C) moderately separated; mesoventrite with
dense punctures, composed of slight network; mesoventral
process emarginate at apex, approximately distinctly longer
than metaventral process; metaventrite with densely granular
punctures, smaller and sparser to apex; metaventral process
cuspidate at apex. Legs. Slender and relatively long, with
dense pubescence; tibiae with two spurs at apex; tarsal for-
mula 5-5-4, mesotarsomeres 1 longer than 2, not longer than
succeeding 2 and 3 combined; metarsomere 1 about as long
as succeeding 2 and 3 combined. Abdomen. Visible abdom-
inal ventrite I often distinctly longer than II, about as long as
succeeding II and III combined; visible abdominal ventrite V
with slight impression in postero-median region; all ventrites
with dense punctures bearing pubescence, punctures smaller
than those of meso- and metaventrites. Aedeagus (Fig. 2D).
Length about 0.6 mm; typical shape of subgenus Abstrulia,
Fig. 1. Habitus of Tetratoma
(Abstrulia) pictipennis, 2.7
mm.
Fig. 2. Tetratoma
(Abstrulia) pictipennis. A, Antenna; B, Head
(dorsal aspect); C, Meso- and metaventrites
(ventral aspect); D,
Median lobe of aedeagus
(ventral aspect). Scale bars: A
-
D=0.2 mm.
A
B C D

Seung-Gyu Lee, Sang-Woo Jung, Yoon-Ho Kim
68 Anim. Syst. Evol. Divers. 38(2), 65-68
with very narrowly divided parameres; aedeagus subparallel-
sided, slightly narrow basally and round at base; widest at
apical sixth, narrow and pointed at apex.
Distribution. Korea (North, South) and Russia (East Siberia,
Far East).
Remarks. This species is very similar to Tetratoma (Abstrulia)
japonica Miyatake with variable elytral patterns, but can be
distinguished by the following characters: anterior patterns of
elytra distinctly sinuate in posterior part, antennomere 3 about
1.4
-
1.6 times as long as wide, antennomere 6 distinctly trans-
verse.
ORCID
Seung-Gyu Lee: https://orcid.org/0000-0002-9512-6073
Sang Woo Jung: https://orcid.org/0000-0001-9545-1207
Yoon-Ho Kim: https://orcid.org/0000-0003-0902-8280
CONFLICTS OF INTEREST
No potential conict of interest relevant to this article was
reported.
ACKNOWLEDGMENTS
We are grateful to Prof. Hiroyuki Yoshitomi (Ehime Univer-
sity, Japan) for providing holotype image and label data. This
work was supported by a grant from the National Institute of
Biological Resources (NIBR), funded by the Ministry of Envi-
ronment (MOE) of the Republic of Korea (NIBR201801203).
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Received December 21, 2021
Revised April 25, 2022
Accepted April 25, 2022