Lathrobium liyangense Peng and Li

Peng, Zhong, Li, Qi-Li, Shen, Liang & Gu, Fu-Kang, 2015, On the Lathrobium fauna of the Donggong Mountains, eastern China, Zootaxa 3905 (2), pp. 245-263 : 257-258

Lathrobium liyangense Peng and Li , new species

( Figs 10 A, 11)

Type material. HOLOTYPE: ♂, labeled ‘ China: Zhejiang Prov., Qingyuan County, mountain near Liyang, 27°49'38''N 119°11'22''E, 990–1160 m, 29.IV.2014, Peng, Song, Yan & Yu leg.’ ( SNUC). Paratypes: 1 ♀, same label data as holotype ( SNUC).

Description. Measurements (in mm) and ratios: BL 6.67–7.06, FL 2.95–3.17, HL 0.85–0.89, HW 0.83–0.88, AnL 1.69–1.76, PL 1.13–1.19, PW 0.94–0.96, EL 0.57–0.61, AL 1.54, HL/HW 1.01–1.02, HW/PW 0.88–0.92, HL/PL 0.75, PL/PW 1.20–1.24, EL/PL 0.50–0.51.

Habitus as in Fig. 10 A. Body brown, legs light brown, antennae brown.

Head weakly oblong; punctation moderately coarse and sparse, sparser in median dorsal portion; interstices with very shallow microreticulation. Eyes moderately small and composed of approximately 45 ommatidia.

Pronotum nearly parallel-sided; punctation weakly defined and sparser than that of head; impunctate midline very broad; interstices without microsculpture.

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

Abdomen with fine and moderately dense punctation, that of tergite VII distinctly sparser than that of anterior tergites; interstices with very shallow microsculpture; posterior margin of tergite VII without palisade fringe; tergite VIII without sexual dimorphism, posterior margin ( Fig. 11 A) weakly convex.

Male. Sternites III–VI unmodified; sternite VII ( Fig. 11 D) transverse, with truncate posterior margin and without modified setae; sternite VIII ( Fig. 11 E) with narrow median impression posteriorly, this impression with numerous modified stout blackish setae, posterior excision V-shaped; aedeagus as in Figs 11 F, G, ventral process very short and stout; dorsal plate long and nearly straight in lateral view; internal sac with two sclerotized spines of different shapes.

Female. Sternite VIII as in Fig. 11 B, posterior margin strongly convex; tergite IX ( Fig. 11 C) with long anteromedian portion and short postero-lateral processes; tergite X ( Fig. 11 C) 0.6 times as long as antero-median portion of tergite IX.

Comparative notes. It resembles L. mu sp. n. from Fengyang Shan in Zhejiang in body size, the shape of the male sternite VII, the presence of two long sclerotized spines in the internal sac of the aedeagus, and in the shapes of the female tergites IX–X and sternite VIII. Lathrobium liyangense is distinguished from L. mu by the darker coloration of the body, the oblong head, the shallow posterior excision of the male sternite VIII, the short and stout ventral process of the aedeagus, as well as the weakly convex posterior margin of the female tergite VIII.

Distribution and biological notes. The type locality is situated near Liyang to the north of Qingyuan, southern Zhejiang. The specimens were sifted from leaf litter in a pine forest at an altitude between 990 and 1160 m, together with L. immanissimum and L. tangi .

Etymology. The specific epithet is derived from Liyang, where the type locality is situated.

Figures

FIGURE 10. Habitus of Lathrobium spp., A — L. liyangense; B — L. mu; C — L. yani. Scale bars: 1.0 mm.

FIGURE 11. Lathrobium liyangense. 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.