Lathrobium yangyihani Lin & Peng, 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 yangyihani Lin & Peng sp. nov.

Figures 1A , 2 , 5

Type material.

Holotype: ♂, labeled 'China: Guangdong Prov., Ruyuan County, Nanling National Nature Reserve, Hamashi, 24°55'37"N, 112°59'21"E, 1,750 m, 01.V.2015, Peng, Tu & Zhou leg.' (SNUC). Paratypes: 3 ♀♀, same data as the holotype (SNUC); 2 ♀♀, labeled 'China: Guangdong Prov., Ruyuan County, Guangdong Di Yi Feng, 24°55'29.62"N, 112°59'31.42"E, 1,538-1,784 m, 28.VI.2020, Xia, Zhang, Yin & Lin leg.' (SNUC); 2 ♀♀, 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: Guangdong Prov., Ruyuan County, Nanling National Nature Reserve, Laopengyidui, 24°56'21"N, 113°01'21"E, 1,260 m, 02.V.2015, Peng, Tu & Zhou leg.' (SNUC); 1 ♂, 1 ♀, labeled 'China: Guangdong Prov., Shixing County, Chebaling, 24°43'12.27"N, 114°11'18.03"E, 904-1,004 m, 23.VI.2020, Xia, Zhang, Yin & Lin leg.' (SNUC).

Description.

Measurements (in mm) and ratios: BL 5.34-6.67, FL 2.19-2.67, HL 0.76-0.98, HW 0.78-0.87, AnL 1.49-1.74, PL 1.00-1.09, PW 0.82-0.93, EL 0.41-0.65, AL 0.81-0.83, HL/HW 0.97-1.13, HW/PW 0.90-1.00, HL/PL 0.75-0.92, PL/PW 1.15-1.27, EL/PL 0.41-0.60.

Habitus as in Figure 1A . Body brown, legs, and antennae light brown.

Head approximately as long as broad; punctation moderately coarse and sparse, sparser in median dorsal portion; interstices with shallow microreticulation; eyes small and composed of approximately 40 ommatidia.

Pronotum nearly parallel-sided; punctation somewhat sparser than that of head; impunctate midline broad; interstices without microsculpture.

Elytral punctation moderately dense, shallow, and ill-defined. Hind wings completely reduced.

Abdomen with fine and moderately sparse punctation, that of tergite VII somewhat sparser 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. 2D ) with very shallow postero-median impression without distinctly modified setae, posterior margin weakly concave in the middle; sternite VIII (Fig. 2E ) with symmetric, subtriangular emargination and shallow impression; aedeagus as in Figure 2F and G , with stout ventral process of highly distinctive shape; dorsal plate with moderately long apical portion and very short basal portion; internal sac without sclerotized spines.

Female. Posterior margin of tergite VIII (Fig. 2A ) strongly convex. Posterior margin of sternite VIII (Fig. 2B ) strongly convex and with moderately dense micropubescence; tergite IX (Fig. 2C ) with very short, medially undivided antero-median portion and moderately long postero-lateral processes; tergite X (Fig. 2C ) 2.5 times as long as antero-median portion of tergite IX.

Comparative notes.

The new species resembles L. guangdongense Peng & Li, 2014 in habitus and the similarly derived morphology of Sternites VII-VIII but differs from this species by the stouter ventral process and the simple internal sac of the aedeagus. For illustrations of L. guangdongense , see Figure 3A-C and Peng et al. (2014).

Etymology.

The species is named after Yi-Han Yang, who supported us on our field trips.

Distribution and natural history.

The species was found in six adjacent localities in western Ruyuan County to southeastern Shixing County. A specimen was sifted, together with L. guangdongense , from moist leaf litter of a secondary mixed and deciduous forest at an altitude of 1,260 m (Fig. 5 ).

Figures

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

Figure 2. Lathrobium yangyihani. 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.

Figure 3. Lathrobium guangdongense (A-C) and L. jiaxingyangi (D-G) 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).