Lathrobium haoae 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 : 250-252

Lathrobium haoae Peng and Li , new species

( Figs 2 C, 5)

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 ♂♂, 2 ♀♀, same label data as holotype ( SNUC); 2 ♂♂, same data, but ‘ 27°54'33''N 119°10'20''E, 1170–1300 m, 07.X.2013, Feng, Peng, Yin & Yu leg’ ( SNUC); 1 ♂, 1 ♀, same data, but ‘ 27°53'59''N 119°09'41''E, 1700 m, 08.X.2013, Peng, Yin & Yu leg.’ ( SNUC); 6 ♂♂, 11 ♀♀, same data, but ‘ 27°53'22''N 119°10'25''E, 1500 m, 05.X.2013, Feng, Peng & Yu leg.’ ( SNUC); 2 ♀♀, same data, but ‘ 27°54'N 119°13'E, 1450–1600 m, 22.VII.2006, Li & Shen leg.’ ( SNUC); 1 ♂, 1 ♀, same data, but ‘ 27°55'N 119°14'E, 1500–1700 m, 27.VII.2006, Li & Shen leg.’ ( SNUC).

Description. Measurements (in mm) and ratios: BL 8.34–10.73, FL 4.45–5.17, HL 1.13–1.26, HW 1.30–1.42, AnL 2.45–2.61, PL 1.67–1.86, PW 1.41–1.52, EL 0.85–0.97, AL 1.91–1.97, HL/HW 0.86–0.90, HW/PW 0.90–0.94, HL/PL 0.66–0.69, PL/PW 1.18–1.23, EL/PL 0.50–0.53.

Habitus as in Fig. 2 C. Body blackish brown, legs brown, antennae dark brown.

Head transverse, weakly dilated posteriorly; punctation coarse and sparse, and distinctly sparser in median dorsal portion; interstices with shallow microreticulation. Eyes 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 rather broad; interstices without microsculpture.

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

Abdomen with moderately fine and moderately dense punctation, punctation 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. 5 A) broadly convex.

Male. Sternite III unmodified; sternite IV ( Fig. 5 D) with dense dark setae in large postero-median impression; sternite V ( Fig. 5 E) similar to sternite IV, but with longer setae in somewhat larger impression and at middle of posterior margin with cluster of several point-like setae; sternite VI ( Fig. 5 F) similar to sternite IV, but with larger impression and at middle of posterior margin with cluster of numerous point-like setae; sternite VII ( Fig. 5 G) strongly transverse, with very shallow median impression posteriorly, this impression without distinctly modified setae, posterior margin broadly concave; sternite VIII ( Fig. 5 H) with triangular, symmetric posterior excision and short dark setae in narrow impression; aedeagus as in Figs 5 I, J, ventral process distinctly asymmetric and moderately long; dorsal plate sclerotized, with broad, large apical portion and with thin basal portion; internal sac with single long strongly sclerotized spine and series of moderately sclerotized spines.

Female. Sternite VIII as in Fig. 5 B, middle of apical margin with apically convex projection; tergite IX ( Fig. 5 C) with very short antero-median portion and short postero-lateral processes; tergite X ( Fig. 5 C) 6.5 times as long as antero-median portion of tergite IX.

Comparative notes. As can be inferred from the similarly derived shapes and chaetotaxy of the male sternite VIII, the similarly derived structure of the aedeagus, as well as from the similar female sexual characters, L. haoae is probably closely allied to the geographically close L. zhui Peng & Li, 2014 . It differs from L. zhui by the smaller postero-median impression on the male sternite IV, the longer modified setae on the male sternite V, the dense dark setae in the large postero-median impression and the numerous point-like setae on the male sternite VI, the broadly concave posterior margin of the male sternite VII, and the slightly larger aedeagus ( L. zhui : length of aedeagus 1.82–1.86 mm) with a somewhat stouter ventral process. For illustrations of L. zhui see Figs 1 D–F 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 1170–1700 m, partly together with L. immanissimum , L. yui and/or L. obstipum .

Etymology. This species is named for Mrs. Cai-Qin Hao, the first author’s wife, who supported us on our field trips.

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

FIGURE 5. Lathrobium haoae. A — female tergite VIII; B — female sternite VIII; C — female tergites IX – X. D — male sternite IV; E — male sternite V; F — male sternite VI; G — male sternite VII; H — male sternite VIII; I — aedeagus in ventral view; J — aedeagus in lateral view. Scale bars: 0.5 mm.