On a Collection of Carabidae from Timor Leste, with Descriptions of Nine New Species (Insecta: Coleoptera, Carabidae)
Author
Baehr, Martin
Author
Reid, Chris A. M.
text
Records of the Australian Museum
2017
2017-11-22
69
6
421
450
http://dx.doi.org/10.3853/j.2201-4349.69.2017.1660
journal article
10.3853/j.2201-4349.69.2017.1660
2201-4349
5237976
0622726F-CAC8-4816-B6B7-2DF2E8BDDA50
Perigona (Trechicus) timorensis
sp. nov.
Baehr
Figs 8
,
16
Holotype
♂
, “
TIMOR LESTE
gorge 1k NE Laclubar
8°44'47"S
125°54'54"
E
uro/siamweed above gorge, at mv light
1030m
3.vi.2012
C. Reid
TL2012/107/598” K402525 (
AMS
)
.
Paratypes
(4):
2 ♂♂
,
1♀
, same data as holotYpe, K402521, K402524 (
♂
,
♀
AMS
)
,
♂
K402523 (
CBM
)
;
1♂
, “
TIMOR LESTE
Mt Laritame.
8,69178S
126.38719E
water tank, edge moss forest,
1150m
TL2012/011/016
mv bucket trap
31.v.2012
” K402522 (
AMS
)
.
Etymology
. The name refers to the occurrence of this species on the island of Timor.
Diagnosis
. A medium sized species with wide subapical channel, very wide aedeagus, and a pattern of various narrow, sclerotized rods in the internal sac (
Fig. 16
); distinguished from most similarly shaped species by combination of wide prothorax with comparatively narrow base, and absence of regularly coiled structures in the internal sac. Further distinguished from the nearest related species
P. punctatostriatus
Baehr, 2013
and
P. moluccensis
Baehr, 2013
by pale latero-apical angles of the pronotum, longer elytra, the wide, pale margin of the elytra, greater number of deeplY impressed elYtral striae, and the different structure of the internal sac of the aedeagus.
Description
.
Measurements
. Body length:
3.65–3.75 mm
; width:
1.7–1.75 mm
. Ratios. Width/length of pronotum: 1.43–1.48; width of widest diameter/base of pronotum: 1.21–1.24; width apex/base of pronotum: 0.93–0.95; width pronotum/head: 1.25–1.31; length/width of elytra: 1.37–1.40.
Colour
(
Fig. 8
). Black, apical angle of the pronotum widely pale yellow, also the lateral part of the elytra, about from 5th stria laterad, widely pale red. Clypeus and labrum, palpi, and antenna yellow to pale red. Femora pale yellow, tibiae and tarse slightly darker, pale red. Under surface more or less dark piceous, but lateral parts of thorax, and the whole abdomen paler, light brown to reddish-brown.
Head
(
Fig. 8
). Of average size, dorsal surface fairly depressed. Eye large, laterad markedly protruded; orbit very short. Labrum in middle slightly incised; mandibles elongate, straight; palpi elongate, maxillary palpus sparsely pilose.
Mentum
with acute, unidentate tooth and two elongate setae. Antenna short, median antennomeres slightly longer than wide. Posterior supraorbital seta situated at posterior margin of eye. Frons slightly convex, frontal furrows wide, fairlY deep, irregularlY curved. Surface with extremelY fine and sparse punctures which are only visible at very high magnification, with traces of verY superficial irregularlY transverse microreticulation, glossy.
Pronotum
(
Fig. 8
). Rather wide, widest slightly in front of middle, dorsal surface fairly depressed. Base rather wide. Apex well excised; apical angle protruded and widely rounded at tip; lateral margin gently convex, in basal third oblique and straight; basal angle obtusely rounded; base laterally slightly convex, in middle straight. Apex and middle of base not margined, lateral parts of base faintly margined. Lateral margin and channel anteriorly narrow, widened and explanate basad. Both transverse sulci shallow, median line distinct, slightly impressed, abbreviated on both ends. Anterior marginal seta situated at apical sixth, posterior marginal seta situated at basal angle. Extremely fine and sparse punctures barelY recognizable even at high magnification; surface in middle without microreticulation, in the apical, lateral, and basal parts with extremelY fine and superficial traces of microsculpture that is composed of transverse lines, very glossy.
Figure 8.
Perigona timorensis
sp. nov.
(body length 3.7 mm).
Elytra
(
Fig. 8
). Rather short and wide, widest slightly behind middle, dorsal surface moderately depressed. Humerus wide, slightly produced but widely rounded, lateral margin slightly convex throughout, apex regularly convex, slightly incurved towards suture. Lateral margin rather narrow, behind humerus extremelY finelY denticulate and sparselY setulose; subapical sulcus rather wide.At least five, in some specimens also six, median striae deeply impressed and almost complete, rather coarsely punctate. The anterior discal puncture situated at basal third, the median puncture behind middle, the third puncture far removed from the apex. The subapical marginal sulcus with sparse and very short pilosity. Surface apparently impunctate, without microreticulation, very glossy, slightly iridescent.
Male genitalia
(
Fig. 16
). Genital ring moderately wide, almost parallel-sided, with wide, oblique, asymmetric apex and very narrow base. Aedeagus very compact, very wide in middle; lower surface gently bisinuate. Apex straight, short, wide, almost symmetric, triangular. Internal sac with several narrow, variously coiled sclerotized rods and folds. Both parameres large and comparatively elongate, with oblique-convex apex.
Female gonocoxites
. Very similar to that of
P. drumonti
Baehr, 2013
as figured in fig.
66 in
Baehr (2013)
: Gonocoxite 1 large, without any setae at the apical rim. Gonocoxite 2 triangularly curved, with slightly obtuse apex; with one elongate ensiform seta in middle of the ventro-lateral margin, a large ensiform set in middle of the dorso-median margin, and two attached nematiform setae originating from a groove in the apical third of the median margin.
Variation
. Very little variation noted.
Distribution
. Central part of Timor Leste.
Collecting circumstances
. The species was sampled at light and in “bucket trap” in open
Eucalyptus
woodland with weeds, and at the edge of moss forest, both localities being slightly above
1000 m
.
Remarks.
This is the first species of
Perigona
explicitly recorded from Timor. However, apart from the widely distributed
P. nigriceps
(Dejean)
which was also present in the examined material, other species are likely to occur on Timor, but have not yet detected as a consequence of the limited exploration of this island.
The new species in its external as well genitalic morphology is very similar to
P. punctatostriata
Baehr, 2013
from
Sulawesi
, less so to
P. moluccensis
Baehr, 2013
from the
Moluccas
. The close relationship to
P. punctatostriata
is best seen in the similarly shaped aedeagus and rather similarly structured internal sac. But also body shape, striation of the elytra, and surface structure are very similar, though the colouration is quite different. ApparentlY the new species forms a group with both mentioned species, which would suggest that it is a southern Oriental faunal element.
Perigona
sp
.
—
1♀
ex. “Valu Sere Resort, opposite Jaco Is
8.40931S
127.29875E
vine thicket on Is, 5mTL2012/004/019
mv bucket trap
26.v.2012
”K402668 (
AMS
). The specimen is quite similar to
P. sumatrensis
Baehr, 2013
, but for a reliable identification of these verY similarlY shaped and structured species the male genitalia are needed
.