Labidolanguria liangi Huang, 2025

Labidolanguria liangi Huang sp. nov.

Figs 1 D View Figure 1 , 2 A – D View Figure 2 , 3 A – L View Figure 3

Type material.

China • Holotype male; Xizang Prov., Motuo , CAS; 1980. V. 19; Leg. Jin Gen-tao, Wu Jian-yi; 24207168; HOLOTYPE, Labidolanguria liangi , det. Huang Z. Z. [red label] . Paratypes. China • 1 ♀; Xizang Prov., Motuo Dexing ; 970 m; CAS; 1980. VI. 1; Leg. Jin Gen-tao, Wu Jian-yi; 24204767 • 1 ♀; Xizang Prov., Motuo Dexing ; 970 m; CAS; 1980. VI. 1; Leg. Jin Gen-tao, Wu Jian-yi; 24204769 • 1 ♀; Xizang Prov., Motuo Kabu ; 1200 m; CAS; 1980. V. 10; Leg. Jin Gen-tao, Wu Jian-yi; 24203357 • 1 ♀; Xizang Prov., Motuo Yadong ; 1250 m; CAS; 1980. V. 25; Leg. Jin Gen-tao, Wu Jian-yi; 24204760 • 1 ♀; Xizang Prov., Motuo Aniqiao ; 1200 m; CAS; 1979. VII. 21; Leg. Jin Gen-tao, Wu Jian-yi; 24201228 • 2 ♀♀; Xizang Prov., Motuo Beibeng ; 800–900 m; CAS; 1983. V. 15; Leg. Han Yin-heng • 1 ♀; Xizang Prov., Motuo, Beibeng ; 850 m; CAS; 1983. V. 15; Leg. Han Yin-heng • 1 ♂; Xizang Prov., Motuo ; 2013. VIII. 02–03; Leg. Bai Xing-long, Shan Jun-sheng; Heibei university museum • 1 ♂; Xizang Prov., Motuo, Beibeng country ; 2013. VII. 30; Leg. Bai Xing-long, Shan Jun-sheng; Heibei university museum • 1 ♂; Xizang Prov., Motuo County, Renqinbeng mount ; 1314 m; 2015. VIII. 26 D; IOZCAS; 29.3175°N, 95.3333°E; Leg. Liang Hong-bin, Wang Ming-qiang GoogleMaps • 14 ♀♀, 3 ♂♂; Xizang Prov., Motuo County, Deguo Bridge ; 837 m; 2015. VIII. 18; IOZCAS; 29.4019°N, 95.3772°E; Leg. Huang Zheng-zhong GoogleMaps • 2 ♀♀, 1 ♂; Xizang Prov., Motuo County, Yarang Village ; 792 m; 2015. VIII. 23; IOZCAS; 29.2964°N, 95.2772°E; Leg. Huang Zheng-zhong GoogleMaps • 3 ♂♂, 2 ♀♀; Xizang Prov., Motuo County Dexing Country ; 796 m; 2015. VIII. 25; IOZCAS; 29.3203°N, 95.2911°E; Leg. Huang Zheng-zhong GoogleMaps • 3 ♂♂, 3 ♀♀; Xizang Prov., Motuo County Motuo Town Lagong Tea plantation ; 1253 m; 2021. VI. 16 D 2; IOZCAS; 29.3191°N, 95.3158°E; sweep-net method; Leg. Liang Hong-bin, Xu Yuan et al GoogleMaps . • 1 ♂, 2 ♀♀; Xizang Prov., Motuo County Motuo Town Lagong Tea plantation ; 1294 m; 2021. VI. 8 D 1; IOZCAS; 29.3187°N, 95.3157°E; Leg. Liang Hong-bin, Xu Yuan GoogleMaps • 2 ♂♂; Xizang Prov., Motuo County, Beibeng Country, Gelin Village ; 1758 m; 2021. VI. 15 D 1; IOZCAS; 29.2134°N, 95.1717°E; Leg. Liang Hong-bin, Xu Yuan GoogleMaps • 1 ♂; Xizang Prov., Motuo County, Beibeng Country, Jiangxin Road 2 km; 830 m; 2021. VI. 12 N 1; IOZCAS; 29.2325°N, 95.1461°E; light trap method; Leg. Liang Hong-bin et al GoogleMaps . • 1 ♀; Xizang Prov., Linzhi City, Motuo County, Beibeng Country , Jiaga Valley ; 677 m; 2021. VI. 13; IOZCAS; 29.2540°N, 95.1965°E; Leg. Liu Hong GoogleMaps • 1 ♀; Xizang Prov., Motuo County, Beibeng Country, Jiangxin Village ; 764 m; 2021. VI. 13; IOZCAS; 29.2240°N, 95.1311°E; Leg. Liu Hong GoogleMaps .

Distribution.

Known only from Motuo County ( China, Xizang Autonomous Region).

Diagnosis.

This species resembles L. mucronata in body structures, but it is distinguished by its darker, duller coloration, and the apex of the elytra which is not as acute. Moreover, L. liangi exhibits sexual dimorphism at the base of the mesotibia: the male mesotibial segment terminates medially with some denticulations and a prominent terminal tooth, while the female lacks these features.

Description.

Body length 12.1–17.1 mm, width 2.4–3.3 mm. Body with coppery, metallic luster. Ventral side dark or black with metallic luster. Abdomen deep or pale brown; middle of ventrites I – IV nearly black and with deep green metallic luster; last ventrite always black and with metallic luster. Coxae and trochanters red-brown; femora and tibiae with green metallic luster. Tarsomeres I – III with indigo metallic luster. Antennomeres I – VII with green metallic luster; antennomeres VIII – XI with indigo metallic luster (Fig. 3 A, B View Figure 3 ).

Body slender and subparallel. Head with dense punctures, coarsest near eyes but finer between eyes. Antennae 11 antennomeres; club pubescence composed of four antennomeres. Compound eyes medium-sized, finely faceted. Clypeofrontal suture obvious; clypeus wider than long, with dense punctures. Anterior edge of clypeus straight or sometimes concave in middle.

Pronotum slightly convex, nearly rectangular, longer than broad, finely punctate; sides subparallel, but middle part of lateral pronotal carina invisible from above. Anterior angle round, thick, and not produced; posterior angle not acute but produced, reaching elytral humeri. Basal fovea deep, with one pair of short, deep lateral fovea. Basal margin complete and clear.

Prosternum coarsely punctate and plicated, without setae. Prosternal process long and trapezoidal, weakly convex in middle, with fine punctures. Each lateral side with deep groove; apex of prosternal process broad.

Scutellar shield liguliform, with round apex. Elytra parallel before apex, regularly striate-punctate, and with intervals with fine punctation. Apices of elytra tapering and acute; sutural angle distinctly acute and produced; outer angle of elytra not acute as sutural angle but more produced.

Mesoventrite coarsely and densely punctate. Median suture of metaventrite not reaching apex of metaventral process. Abdomen finely punctate, with one pair of long, parallel coxal lines, reaching half of ventrite 1. Last ventrite with dense, yellow setae at apex. Male genitalia similar to those congeners in the genus. Median lobe long and slender, slightly curved. Apex of median lobe somewhat acute (Fig. 3 E – G View Figure 3 ); internal sac invisible. Paramere slender, with apex not produced and with short yellow setae (Fig. 3 H, I View Figure 3 ). Ovipositor short, with apex sclerotized and acute, without stylus and setae (Fig. 3 J, K View Figure 3 ). Spermathecal capsule heart-shaped (Fig. 3 L View Figure 3 ).

Dimorphism.

The sexual dimorphism of this species is mainly reflected in the varying number of spines along the inner side of the mesotibia in males, with sometimes large, prominent terminal spines (Fig. 3 C, D View Figure 3 ). This feature is not found in other species of the genus and is very rare even at the subfamily Languriinae in general. Some languriines exhibit sexual dimorphism in the form of protuberances on the profemur of males, such as in the genera Doubledaya and Callilanguria ( Huang et al. 2018) .

Etymology.

The specific epithet honors Dr. Hong-bin Liang, a specialist of Carabidae from the Institute of Zoology, Chinese Academy of Sciences, for his outstanding leadership and contribution during multiple expeditions in Yunnan and Xizang provinces.

Host plant.

In the field, we observed that this new species is relatively common in shrublands mixed with plants outside Motuo County and along the Renqingbeng Mountain Road (Fig. 4 A, B View Figure 4 ). It lives on Diplazium sp. (family Athyriaceae ) and was observed feeding on spores of this fern (Fig. 4 C View Figure 4 ).

Variation.

The variation of this species is mainly reflected in its body color and the spines on the mesotibia of males. Early collected specimens generally have a brownish body with a weak metallic luster. However, the specimens we collected in Motuo in recent years have a relatively dark - green body with a slight metallic luster. The differences in the spines on the inner side of the mesotibia of males among different individuals are also large, some are obvious, while others are not very prominent.