Lathrobium yui 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 : 254-256

Lathrobium yui Peng and Li , new species

( Figs 6 B, 8)

Type material. HOLOTYPE: ♂, labeled ‘ China: Zhejiang Prov., Lishui City, Longquan, Fengyang Shan, 27°55'06''N 119°11'26''E, 900 m, 04.X.2013, Feng, Peng & Yu leg.’ ( SNUC). Paratypes: 1 ♂, 1 ♀, same label data as holotype ( SNUC); 1 ♂, 2 ♀♀, same data, but ‘ 27°55'58''N 119°10'57''E, 690–780 m, 09.X.2013, Peng, Yin & Yu leg’ ( SNUC); 3 ♀♀, same data, but ‘ 27°54'36''N 119°10'20''E, 1320 m 27.IV.2014, Peng, Song, Yan, Yin & Yu leg.’ ( SNUC); 2 ♂♂, 3 ♀♀, same data, but ‘ 27°54'33''N 119°10'20''E, 1170–1300 m, 06.X.2013, Feng, Peng, Yin & Yu leg’ ( SNUC); 2 ♀♀, same data, but ‘ 27°54'N 119°10'E, 1350–1500 m, 22.VII.2006, Li & Shen leg’ ( SNUC); 1 ♀, same data, but ‘ 27°54'N 119°13'E, 1450–1600 m, 22.VII.2006, Li & Shen leg’ ( SNUC);.

Description. Measurements (in mm) and ratios: BL 7.23–8.62, FL 3.95–4.38, HL 1.04–1.18, HW 1.11–1.24, AnL 2.04–2.24, PL 1.37–1.52, PW 1.15–1.30, EL 0.70–0.76, AL 1.52–1.59, HL/HW 0.93–0.96, HW/PW 0.94–0.98, HL/PL 0.75–0.78, PL/PW 1.16–1.19, EL/PL 0.50–0.52.

Habitus as in Fig. 6 B. Body blackish brown, legs brown, antennae dark brown.

Head weakly transverse, dilated posteriorly; punctation coarse and moderately sparse, and distinctly sparser in median dorsal portion; interstices with shallow microreticulation. Eyes relatively large and composed of approximately 60 ommatidia.

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

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

Abdomen with moderately fine and dense punctation, that of tergite VII sparser than that of anterior tergites; interstices with shallow microsculpture; posterior margin of tergite VII without palisade fringe; tergite VIII without sexual dimorphism, posterior margin ( Fig. 8 A) broadly convex.

Male. Sternites III–IV unmodified; sternite V ( Fig. 8 D) with dense dark setae in large postero-median impression and at middle of posterior margin with cluster of several point-like setae; sternite VI ( Fig. 8 E) similar to sternite V, but with smaller impression; sternite VII ( Fig. 8 F) strongly transverse, with small and shallow median impression posteriorly, this impression with few stout blackish setae posteriorly, posterior margin broadly and weakly concave, without distinct concavity in middle; sternite VIII ( Fig. 8 G) with moderately asymmetric and extensive median impression posteriorly, this impression with numerous distinctly modified, stout blackish setae, posterior excision small and asymmetric; aedeagus as in Figs 8 H, I, ventral process asymmetric and apically acute; dorsal plate with large apical portion and very short basal portion; internal sac with three sclerotized spines of different shapes.

Female. Sternite VIII as in Fig. 8 B, posterior margin convex; tergite IX ( Fig. 8 C) with short antero-median portion and moderately long postero-lateral processes; tergite X ( Fig. 8 C) 2.5 times as long as antero-median portion of tergite IX.

Comparative notes. The new species resembles L. baishanzuense Peng & Li, 2012 from Baishanzu Natural Reserve, Zhejiang in having similar postero-median impressions on the male sternites V–VI, a weakly concave posterior margin of the male sternite VII and an aedeagus with a similarly derived dorsal plate (apical portion large and basal portion very short). It is distinguished from L. baishanzuense by the smaller postero-median impression on the male sternite V, the denser modified setae on the male sternite VI, the stout blackish setae at the posterior margin of the male sternite VII, the smaller posterior excision of the male sternite VIII and the shape of the ventral process of the aedeagus. For illustrations of L. baishanzuense see Figs 1 A–C and Peng et al. (2012a).

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, moss and humus in deciduous forests with bamboo at altitudes of 690–1600 m, partly together with L. immanissimum , L. haoae and/or L. obstipum .

Etymology. The species is named for Yi-Ming Yu, who collected some of the type specimens.

Figures

FIGURE 1. Lathrobium baishanzuense (A – C) and Lathrobium zhui (D – F), A — female tergite VIII; B — female sternite VIII; C — female tergites IX – X; D — female tergite VIII; E — female sternite VIII; F — female tergites IX – X. Scale bars: 1.0 mm.

FIGURE 6. Habitus of Lathrobium spp., A — L. songi; B — L. yui; C — L. fengyangense. Scale bars: 1.0 mm.

FIGURE 8. Lathrobium yui. A — female tergite VIII; B — female sternite VIII; C — female tergites IX – X. D — male sternite V; E — male sternite VI; F — male sternite VII; G — male sternite VIII; H — aedeagus in ventral view; I — aedeagus in lateral view. Scale bars: 0.5 mm.