Oodinotrechus liyoubangi, Tian, 2014

Tian, Ming-Yi, 2014, A new species of the subterranean genus Oodinotrechus Uéno, 1998, from northern Guangxi, China, with additions to the generic diagnosis (Coleoptera: Carabidae: Trechinae), Journal of Natural History (J. Nat. Hist.) 48 (33 - 34), pp. 2097-2104 : 2098-2103

Oodinotrechus liyoubangi n. sp.

Diagnosis

Similar to the type species O. kishimotoi , but easily distinguished from the latter by its pronotum which is less protruded posteriorly in the middle portion, so that scutellum is at least partly visible from above (completely concealed by pronotum in O. kishimotoi ); hind angle of pronotum distinctly pointed, basal margin of hind angle nearly straight (hind angle lobed in O. kishimotoi ); apex of the median lobe of aedeagus parallel sided in dorsal view (slightly expanded and gradually narrowed towards apex in O. kishimotoi ), and both parameres bearing four long setae at apices (two or three in O. kishimotoi ).

Description

Length: 5.2–5.3 mm; width (=EW): 2.0– 2.1 mm. Habitus as in Figure 1 .

Depigmented; yellowish brown to slightly reddish dark brown, very shiny, antennomeres 6–11, palps, and tarsi light yellowish; microsculpture formed by faintly engraved transversely meshes.

Head stout and short, distinctly longer than wide, HL/HW = 1.41–1.52; somewhat depressed above, eyes effaced, completely blind; frons and vertex moderately convex; frontal impressions well marked, deeply and distinctly divergent behind; genae moderately convex posteriorly, covered with several longer setae; vertex short and broad; clypeus strongly transverse, quadrisetose; labrum transverse, straight at frontal margin; mandibles short, right mandible tridentate, gently arcuate inwards and acute at apex; labial suture present, separating mentum and submentum, the former bisetose, the latter sexsetose; ligula small, sexsetose at apex; palps slender, labial palpomere 2 longer than 3, slightly arcuate and gradually dilate towards apex, bisetose on inner margin, and with one or two additional setae near apex; maxillary palpomere 3 slightly shorter than 4; antennae subfiliform, short, not extending beyond basal 1/3 of elytra; pubescent from antennomere 2, antennomere 1 with several additional setae near apex; antennomere 1 slightly longer than 2, shorter than 3; antennomere 3 the longest, slightly longer than 4 and the subsequent joints.

Pronotum transversely campanulate, PW/PL = 1.24–1.29; disc sparsely pubescent with several short setae on each side behind middle; distinctly convex, base strongly bisinuate, forming a narrow, transverse through hole on each side between pronotum and elytra; sides slightly explanate, not sinuate near hind angle, with distinct postangular denticulate; basal margin wider than apical margin, PWB/PWA = 1.43–1.48; base strongly sinuate, the median portion protrudent posteriorly, but sides hardly lobed, hind angle distinctly pointed, basal margins of hind angles nearly straight; both anterior and posterior lateral setae present, lateral margin gradually explanate and distinctly reflexed from apical angle towards basal angle, which is very wide in basal area; median line fine, rather deep; frontal transverse impression faint, posterior one well marked, basal foveae small and clear; scutellum small, visible from above.

Elytra short and ovate, base almost straight, wide and broad, apex quite narrow, EL/EW = 1.41–1.43; widest at about 1/3 from base; lateral margin distinctly serrulate near basal area and ciliated throughout; scutellar striole absent; striae 1–3 distinct, others faint but with punctures traceable; three well-marked dorsal setiferous pores present, the first on stria 3, at about basal 1/6 of elytra, second one on interval 5 at a little before middle, third one on interval 4 at the terminus, at about apical 1/4, close and just against apical striole; the distance between first and second dorsal pores shorter than that between second and third; intervals flat; marginal umbilicate pores regularly aggregated ( Figure 2 ) and similar to those in O. kishimotoi .

Legs rather stout, similar to O. kishimotoi .

Male genitalia ( Figure 2B, C ): aedeagus well sclerotised; the median lobe small, strongly arcuated, basal portion very large, with a large and rounded sagittal aileron; dorsal opening wide, apical lobe rather long, parallel sided, and tube like; inner sac armed with a distinct copulatory piece which is somewhat spatulate; parameres short and broad, right one distinctly longer than left one, both roundly broad at apex and bearing four long setae.

Type material

Holotype. ♂, labelled ‘ Guangxi: Huanjiang Maonan Autonomous Xian : Mulun National Nature Reserve : Zhonglun (western part of the NR): Ganchao Dong, 107°55′37.21″ E / 25°07′27.48″ N, 2011-VI-24, Li Youbang leg., CHIgx11-LYB07’, deposited in the Insect Collections of South China Agricultural University, Guangzhou ( SCAU).

Paratypes. one ♂, one ♀. same data as holotype, in SCAU (♀) and the Paris Museum of Natural History ( MNHN, Paris) (♂), respectively ; one ♂, one ♀. ‘ Guangxi: Huanjiang Maonan Autonomous County: Mulun National Nature Reserve: Hongdong (western part of the NR): Gouyu Dong , 107°58′11.79″ E / 25°08′ 49.15″ N, 2011-VI-27, Li Youbang leg., CHIgx11-LYB09’, in SCAU (♂) and the Zoological collections of Guangxi Normal University, Guilin (♀), respectively ; one ♂. ‘ Guangxi: Huanjiang Maonan Autonomous County: Mulun National Nature Reserve: Baidan (eastern part of the NR): Chang Dong , 107°58′47.20″ E / 25°09′ 15.60″ N, 2011-VIII-26, Li Youbang leg., CHIgx11-LYB14’, in SCAU .

Etymology

This new species is named in honour of Dr. Li Youbang (Guangxi Normal University, Guilin ), a specialist of Primates, who collected the type specimens .

Distribution

Northern Guangxi (Huanjiang) ( Figure 3 ). Known only from the type localities. All three limestone caves are located in Mulun National Nature Reserve , northwest Huanjiang Xian , northern Guangxi and not far from the border to Guizhou Province and about 40–45 km from the type locality of O. kishimotoi . They are small and simple caves, each with only a main, more or less horizontal passage. Among them, Ganchao Dong and Gouyu Dong are short, about 40 m and 50 m in length, respectively, and Chang Dong is about 110 m long. All beetles were collected in dark areas of the caves .

Additions to the generic characters of Oodinotrechus

Although the main generic characters of Oodinotrechus were described in detail by the original author, the finding of O. liyoubangi n. sp. could provide the following additional but important characters for the genus: scutellum partly visible or concealed by the median protruding of pronotum; abdominal ventrite VII bisetose in both sexes; protarsi not modified in male and without spongy setae ventrally; aedeagus well sclerotised; the median lobe strongly arcuated, basal portion wide, with a large sagittal aileron; dorsal opening wide, apical lobe rather long, parallel sided or slightly constricted towards the broad apex; parameres short and stout, right one distinctly longer than left one, both broadly rounded at apex and bearing two to four long setae.

Geographical distribution of the genus Oodinotrechus

Members of Oodinotrechus are distributed in southern Guizhou and northern Guangxi. So far only two species are known, viz. the type species O. kishimotoi was only recorded in the type locality (Shuiboshui Dong, in Yuping Zhen, Libo Xian, Guizhou Province); and the second species, O. liyoubangi n. sp., was collected in three caves in Mulun National Nature Reserve, Huanjiang Xian, northern Guangxi which are not far from the locality of O. kishimotoi ( Figure 3 ).

Figures

Figure 1. Habitus of O. liyoubangi, n. sp. paratype, female (scale bar = 1.0 mm).

Figure 2. O. liyoubangi, n. sp. (A) left elytron, dorsal view; (B) median lobe and parameres of aedeagus, lateral view; (C) apical lobe of aedeagus, dorsal view. Scales: a for B, C; b for A.

Figure 3. Geographical distribution of the genus Oodinotrechus (̇O. kishimotoi Uéno; ●O. liyoubangi, n. sp.; (A) map of China, showing the location of Guizhou and Guangxi in China; (B) map of Guangxi and Guizhou, showing the location of Mulun-Maolan karstic area).