Lathrobium wangxingmini Peng & Lin, 2021

Lin, Xiao-Bin, Zhen, Yi-Dan & Peng, Zhong, 2021, On the Lathrobium fauna of the Nanling National Nature Reserve, southern China (Coleoptera, Staphylinidae, Paederinae), ZooKeys 1054, pp. 15-24 : 15

Lathrobium wangxingmini Peng & Lin sp. nov.

Figures 1C , 4 , 7

Type material.

Holotype: ♂, labeled 'China: Guangdong Prov., Ruyuan County, Nanling National Nature Reserve, Walkway, 24°55'57"N, 113°00'18"E, 1,220 m, 28.IV.2015, Peng, Tu & Zhou leg.' (SNUC). Paratypes: 1 ♀, labeled 'China: Guangdong Prov., Ruyuan County, Nanling National Nature Reserve, Shikengkong, 24°55'33"N, 112°59'29"E, 1,820 m, 30.IV.2015, Peng, Tu & Zhou leg.' (SNUC); 1 ♀, labeled 'China: Guangdong Prov., Ruyuan County, Nanling National Nature Reserve, Shikengkong, 24°55'38"N, 112°59'30"E, 1,850 m, 27.IV.2015, Peng, Tu & Zhou leg’ (SNUC); 1 ♀, labeled 'China: Hunan Prov., Yizhang County, Mangshan Nature reserve, 24°56'26"N, 112°59'18"E, 1,400 m, 26.IV.2015, Peng, Tu & Zhou leg.' (SNUC); 1 ♂, 2 ♀♀, labeled 'China: Guangdong Prov., Ruyuan County, Nanling National Nature Reserve, 1,090 m, 18.VI.2007, Huang & Xu leg.' (SNUC).

Description.

Measurements (in mm) and ratios: BL 8.62-10.56, FL 3.48-4.27, HL 1.30-1.67, HW 1.30-1.52, AnL 2.32-2.70, PL 1.57-1.85, PW 1.33-1.57, EL 0.61-0.83, AL 2.25, HL/HW 1.00-1.15, HW/PW 0.96-0.98, HL/PL 0.82-0.95, PL/PW 1.18-1.19, EL/PL 0.39-0.45.

Habitus as in Fig. 4C . Body blackish brown, legs brown, antennae dark to light brown.

Head transverse; punctation coarse and dense, sparser in median dorsal portion; interstices with distinct microsculpture.

Pronotum nearly parallel-sided; punctation somewhat sparser than that of head; impunctate midline broad; interstices without microsculpture. Eyes moderately big and composed of approximately 80 ommatidia.

Elytral punctation dense and defined. Hind wings completely reduced. Protarsi without appreciable sexual dimorphism, distinctly dilated.

Abdomen with fine and dense punctation, punctation of tergite VII slightly less dense than that of anterior tergites; interstices with shallow microsculpture; posterior margin of tergite VII without palisade fringe.

Male. Sternites III-VI unmodified; sternite VII (Fig. 4D ) strongly transverse, with shallow median impression posteriorly with numerous distinctly modified, short black setae, posterior margin nearly truncate; sternite VIII (Fig. 4E ) strongly modified and of distinctive shape and chaetotaxy, with deep and extensive median impression, middle of this impression with unmodified pubescence, laterally with dense short and very stout black setae, posterior margin deep and weakly asymmetric; aedeagus as in Figure 4F and G ; ventral process asymmetric and apically acute; dorsal plate with long apical portion and very short basal portion; internal sac with one long sclerotized spine.

Female. Posterior margin of tergite VIII (Fig. 4A ) strongly convex. Posterior margin of sternite VIII (Fig. 4B ) strongly convex and with moderately dense micropubescence; tergite IX (Fig. 4C ) with short antero-median portion and slender postero-lateral processes; tergite X (Fig. 4C ) 2.5 times as long as antero-median portion of tergite IX.

Comparative notes.

Lathrobium wangxingmini resembles L. jiaxingyangi sp. nov. in having the similarly derived chaetotaxy of the asymmetric male sternite VIII and the long dorsal plate of the aedeagus. It is distinguished from L. jiaxingyangi by the darker coloration, the larger body size, more dense short black setae in the impression of the male sternite VII, the deeper posterior excision of the male sternite VIII and the morphology of the aedeagus (shape of ventral process; internal sac with one longer sclerotized spine).

Etymology.

The species is dedicated to Xing-Min Wang, who supported us on our field trips.

Distribution and natural history.

The species was found in five adjacent localities in western Ruyuan County to southern Yizhang County. Some specimens were sifted from the leaf litter of mixed deciduous forests at an altitude of 1,090 m (Fig. 7 ).

Figures

Figure 1. Male habitus of Lathrobium spp. A L. yangyihani B L. jiaxingyangi C L. wangxingmini. Scale bars: 1.0 mm.

Figure 4. Lathrobium wangxingmini. A female tergite VIII B female sternite VIII C female tergites IX-X. D male sternite VII E male sternite VIII F aedeagus in ventral view G aedeagus in lateral view. Scale bars: 0.5 mm.

Figures 5 - 7. Collecting sites on the Nanling National Nature Reserve 5 type localities of Lathrobium yangyihani (1,260 m) 6 type locality of Lathrobium jiaxingyangi (1,850 m) 7 type locality of Lathrobium wangxingmini (1,090 m).