On a collection of Batraxis Reitter (Coleoptera: Staphylinidae: Pselaphinae) from Hainan Island, southern China
Author
Wang, Dan
Author
Yin, Zi-Wei
Author
Wang, Chun-Xin
text
Zootaxa
2016
4109
1
1
15
journal article
39133
10.11646/zootaxa.4109.1.1
4dcea233-45e7-4c56-a91c-e97d6c250262
1175-5326
258822
5AA87F55-DE88-419B-98D4-ECDC3AE09FAE
6.
Batraxis minor
Wang and Yin
,
new species
(
Figs 3
B, 5L, 8D–F)
Type
material
(4 ♂♂, 16 ♀♀).
Holotype
:
CHINA
:
♂, labeled ‘
CHINA
: Hainan, Ledong Hsien, Jianfengling N.R., Mingfenggu,
18°44'30"N
,
108°50'29"E
, rainforest, decaying log,
995 m
,
26.i.2015
, Peng, Yin, Tu, Song, Shen, Zhou, Wang leg.’
Paratypes
:
CHINA
:
1 ♂
, 5 ♀♀, same label data as
holotype
; 2 ♂♂, 7 ♀♀, same data as previous material except ‘
27.i.2015
’; 4 ♀♀, same data as previous material except ‘
23.i.2015
’.
Diagnosis of male.
Body with sparse, minute pubescence in most areas; frons with shallow subantennal transverse sulcus; vertex lacking median pit; antennomeres IX as long as wide; pronotum with shallow median antebasal fovea and basal impression; all tibiae thin; protibiae lacking modifications, mesotibiae without apical spur; protrochanters protuberant ventrally; tergite IV with narrow basal sulcus; discal carinae long, close; with short marginal carinae; aedeagus relatively elongate.
Description.
Male (
Fig. 3
B). Body yellowish brown, with sparse, minute pubescence in most areas, length
1.37 mm
. Head rectangular, as long as broad, HL = HW
0.32 mm
, vertex glabrous, apical margin of frons and clypeus sparsely pubescent; vertex moderately convex, with pair of indistinct vertexal foveae; antennal tubercles low; frons flattened, with shallow subantennal transverse sulcus, lacking vertexal sulcus; each eye composed of about 30 facets; antennae relatively thick, antennomeres III–VII slightly elongate, VIII as long as wide, IX narrower than VIII, X transverse, XI largest, widest near base, then obliquely narrowing toward apex; median gular carina shallow, with two clearly separated distinct gular foveae. Pronotum slightly wider than long, PL
0.27 mm
, PW
0.32 mm
, with shallow median antebasal fovea and complete basal impression. Elytra wider than long, EL
0.40 mm
; EW
0.50 mm
, with two pairs of shallow foveae at base. Protrochanters strongly protuberant at ventral margin (
Fig. 5
L). Abdomen wider than long, AL
0.38 mm
, AW
0.45 mm
, slightly narrowed at base; tergite IV (first visible tergite) sparsely pubescent, with broad, abrupt basal sulcus; discal carinae relatively long, close extending to one-third of tergal length, width between discal carinae
0.11 mm
at apices; short marginal carinae extending to apical one-third of tergal length. Aedeagus (
Fig. 8
D–F)
0.24 mm
in length, relatively elongate, parameres exceeding apex of median lobe, expanded at apex, each with three preapical setae; endophallus with pair of symmetric sclerites and weakly sclerotized structure connecting them.
Female. Very similar to male in general appearance; protrochanters simple; each eye composed of about 30 facets. Measurements: BL
1.35 mm
; HL
0.31 mm
; HW
0.32 mm
; PL
0.27 mm
; PW
0.33 mm
; EL
0.41 mm
; EW
0.50 mm
; AL
0.36 mm
; AW
0.47 mm
; width between discal carinae of tergite IV
0.10 mm
at apices.
Comparative notes.
Batraxis minor
is unique by the small body size (
1.37 mm
) and largely reduced subantennal transverse sulcus, when combined with the structure of the aedeagus, this species can be readily separated from all other congeners from Hainan.
Distribution.
Southern
China
: Hainan.
Etymology.
The specific epithet refers to the small body size.