Lathrobium yangshimuense Peng

Peng, Zhong, Li, Li-Zhen & Zhao, Mei-Jun, 2016, On the Lathrobium fauna of the Luoxiao Mountains, Central China, Zootaxa 4158 (3), pp. 385-402 : 398-400

Lathrobium yangshimuense Peng and L.-Z. Li, new species

(Map 1, Figs 9 B, 11)

Type material. HOLOTYPE: Ƌ, labeled ‘ China: Jiangxi Prov., Luxi County, Yangshimu , 27°35'07''N 114°15'41''E, 1360 m, 24.X.2013, Peng, Shen & Yan leg.’ ( SNUC) . Paratypes: 1 Ƌ, same label data as holotype (SNUC); 1 ♀, same data, but ‘ 27°34'25''N 114°14'14''E, 910–1550 m, 16.VII.2013, Song, Yin & Yu leg.’ ( SNUC) .

Description. Measurements (in mm) and ratios: BL 7.42–7.58, FL 3.07–3.12, HL 0.80–0.83, HW 0.78–0.81, AnL 1.67–1.79, PL 1.04–1.10, PW 0.83–0.86, EL 0.59–0.67, AL 1.11, HL/HW 1.00–1.02, HW/PW 0.93–0.94, HL/PL 0.75–0.77, PL/PW 1.25–1.28, EL/PL 0.57–0.61.

Habitus as in Fig. 9 B. Body reddish brown, legs yellowish brown, antennae reddish brown to yellowish brown.

Head: punctation coarse and moderately dense, and distinctly sparser in median dorsal portion; interstices with distinct microreticulation. Eyes small and composed of approximately 30 ommatidia.

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

Elytral punctation moderately dense and shallow. Hind wings completely reduced. Protarsi with distinct sexual dimorphism.

Abdomen with fine and dense punctation, punctation of tergite VII slightly less sparse than that of anterior tergites; interstices with shallow, but distinct microsculpture; posterior margin of tergite VII without palisade fringe; tergite VIII without sexual dimorphism, posterior margin ( Fig. 11 A) convex in both sexes.

Male. Sternites III–VI unmodified; sternite VII ( Fig. 11 D) strongly transverse, with very shallow median depression posteriorly, this impression without distinctly modified setae, posterior margin broadly concave; sternite VIII ( Fig. 11 E) oblong and symmetric, with longitudinal impression extending along whole sternite, middle of sternite narrowly without setae, posterior excision V-shaped and stout, at margins with blackish setae; aedeagus as in Figs 11 F, G; ventral process weakly asymmetric in ventral view and apically acute; dorsal plate with long and strongly sclerotized apical portion, and with thin basal portion; internal sac with a long sclerotized spine.

Female. Sternite VIII as in Fig. 11 B, posterior margin distinctly convex; tergite IX ( Fig. 11 C) with divided median portion and moderately long postero-lateral processes; tergite X ( Fig. 11 C) 4.8 times as long as anteromedian portion of tergite IX.

Comparative notes. The new species resembles L. badagongense Peng & Li, 2014 from Badagong Shan, Hunan in the shape of the male sternite VIII, the morphology of the aedeagus (shape of ventral process; distinctly sclerotized apical portion of dorsal plate) and the female sexual characters (shape of sternite VIII; divided median portion of tergite IX). It is distinguished from L. badagongense by reddish brown coloration, the chaetotaxy of the male sternite VIII, the internal structures of the aedeagus, as well as the shape of the female tergite VIII. For illustrations of L. badagongense see Peng et al. (2014).

Distribution and natural history. The species was collected in two localities in Yangshimu to the east of Luxi, western Jiangxi. The specimens were sifted from leaf litter in a coniferous forest at altitudes between 910 and 1550 m, partly together with L. taiye .

Etymology. The species is named after its type locality (Yangshimu).

Figures

FIGURE 9. Habitus of Lathrobium spp., A — L. taiye; B — L. yangshimuense; C — L. yipingae. Scale bars: 1.0 mm.

FIGURE 11. Lathrobium yangshimuense. 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.