Lathrobium yani 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 : 261

Lathrobium yani Peng and Li , new species

( Figs 10 C, 13)

Type material. HOLOTYPE: ♂, labeled ‘ China: Zhejiang Prov., Lishui City, Longquan, Fengyang Shan, 27°55'47''N 119°10'38''E, 1570 m, 26.IV.2014, Peng, Song, Yan, Yin & Yu leg.’ ( SNUC). Paratypes: 2 ♀♀, same label data as holotype ( SNUC).

Description. Measurements (in mm) and ratios: BL 9.84–10.29, FL 4.45–5.12, HL 1.17–1.33, HW 1.31–1.41, AnL 2.57–2.89, PL 1.66–1.72, PW 1.38–1.44, EL 0.87–0.91, AL 1.89, HL/HW 0.89–0.94, HW/PW 0.98–1.00, HL/PL 0.70–0.77, PL/PW 1.18–1.20, EL/PL 0.51–0.53.

Habitus as in Fig. 10 C. Body blackish brown, legs brown, antennae dark brown.

Head transverse; punctation moderately coarse and moderately dense, somewhat sparser in median dorsal portion; interstices with shallow microreticulation. Eyes moderately small and composed of approximately 50 ommatidia.

Pronotum with weakly convex lateral margins in dorsal view; punctation shallower and sparser than that of head; impunctate midline broad; interstices without microsculpture.

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

Abdomen with fine and dense punctation, that of tergite VII 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. 13 A) weakly convex.

Male. Sternites III–VI unmodified; sternite VII ( Fig. 13 D) strongly transverse, with shallow median impression posteriorly, this impression with weakly modified setae, posterior margin weakly concave in middle; sternite VIII ( Fig. 13 E) with pair of small impressions posteriorly, these impressions with few distinctly modified, stout and dark setae, posterior excision shallow and small; aedeagus as in Figs 13 F, G, ventral process asymmetric in ventral view, long and broad in lateral view; dorsal plate with long apical portion and very short basal portion; internal sac with two long and slender sclerotized spines.

Female. Sternite VIII as in Fig. 13 B, middle of apical margin with apically convex projection; tergite IX ( Fig. 13 C) with short antero-median portion and moderately long postero-lateral processes; tergite X ( Fig. 13 C) 5.2 times as long as antero-median portion of tergite IX.

Comparative notes. The new species resembles Lathrobium tamurai Watanabe & Luo, 1992 from Wuyanling Natural Reserve, Zhejiang in the shape of the male sternite VII, the presence of a pair of small posterior impressions on the male sternite VIII, and the presence of two long sclerotized spines in the internal sac of the aedeagus. Lathrobium yani is distinguished from L. tamurai by larger body size, the blackish brown coloration, the smaller posterior excision of the male sternite VIII, the broader ventral process and shorter dorsal plate of the aedeagus, as well as the shape of the female sternite VIII. For illustrations of L. tamurai see see Figs 2 B, 4.

Distribution and biological notes. The type locality is situated in the Fengyang Shan to the south of Longquan, southern Zhejiang. The specimens were sifted from leaf litter and humus in a rhododendron forest at an altitude of 1570 m, together with L. haoae .

Etymology. The species is named for Zhu-Qi Yan, who collected some of the type specimens.

Figures

FIGURE 2. Habitus of Lathrobium spp., A — L. imadatei; B — L. tamurai; C — L. haoae. Scale bars: 1.0 mm.

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

FIGURE 13. Lathrobium yani. 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.