Lisubatrus dongzhiweii, Yin, 2017

Yin, Zi-Wei, 2017, Lisubatrus dongzhiweii gen. et sp. nov. from the Gaoligong Mountains, China (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 57 (2), pp. 593-601 : 598-600

Lisubatrus dongzhiweii sp. nov.

( Figs 1–3 )

Type locality. Qinlangdan, Dulongjiang Village, Nujiang Lisu Autonomous Prefecture , Yunnan, China.

Type material. HOLOTYPE: ♂, CHINA, YUNNAN, Nujiang Lisu Autonomous Prefecture (怒江傈僳Ŕffl治州), Dulongjiang Village ( ȒAE 江乡), Qinlangdan (Ẇ兰当, ca. 27°41′N, 98°16′E), 1200–1400 m, Malaise trap, vi.2016, Zhi-Wei Dong leg. ( SNUC).

Diagnosis. Same as the genus, with the following additions: vertex with an acute spine in middle; antennomeres II–VII distinctly elongate, VIII shorter than VII, IX–XI much wider than previous ones; mesotrochanter with a blunt ventral projection; metatrochanter with a long, apically curved projection; aedeagus with dorsal lobe bifurcate at the apex.

Description. Male ( Fig. 1 ). Length 1.91 mm. Body uniformly reddish-brown, mouth parts, tibiae and tarsi lighter in color.

Head ( Figs 2B–C ) sub-rectangular, slightly wider than long, length from clypeal anterior margin to head base 0.33 mm, width across eyes 0.44 mm, glabrous, dorsum sparsely with long setae; vertex with small, punctiform foveae at level of posterior margin of eyes, lacking sulcus connecting foveae, and lacking lateral carinae, posterolateral margins with row of dense setae; antennae ( Fig. 2A ) long and slender, distinct clubs formed by apical three antennomeres, antennomeres I–VIII strongly elongate, IX–XI enlarged. Pronotum ( Figs 2B–C ) about as long as wide, widest at middle, length along midline 0.43 mm, maximum width 0.41 mm; disc glabrous, setation similar to that of head; pronotum lacking foveae, with pair of small, acute antebasal spines. Elytra ( Fig. 2D ) slightly wider than long, strongly constricted at base and at apex; length along suture 0.64 mm, maximum width 0.68 mm; lacking basal foveae and discal striae, with shallow but complete sutural striae, lacking marginal fovea and striae, humeri slightly angulate. Mesoventrite ( Fig. 2E ) with pair of distinct lateral carinae. Metaventrite ( Fig. 2E ) more densely setose in middle than at lateral portions; posterior margin with small notch in middle. Mesotrochanters with broad and blunt projection on ventral margin ( Fig. 2E ); metatrochanters with long, apically curved ventral projection. Tergite IV ( Fig. 2F ) predominantly large, much longer than tergites V–VII combined; with pair of thick, triangular discal carinae, lacking marginal carinae and distinct basal impression, tergites V and VI subequal in length at middle, VII longer than V and VI combined, VIII ( Fig. 3A ) transverse, with broad emargination at middle of posterior margin. Sternite IV longer than V–VIII combined, with broad and flat basolateral ridges, sternites V–VII subequal in length in midline, sternite VIII ( Fig. 3B ) strongly transverse, and with rounded posterior margin. Length of aedeagus ( Figs 3C–E ) 0.32 mm; aedeagal median lobe with large, transverse basal bulb and foramen, and round and bent apex; with flat and weakly sclerotized ventral membrane; dorsal lobe broad at base and narrowed apically, bifurcate at apex.

Female. Unknown.

Biology. The single specimen was collected by a Malaise trap, so the exact habitat of this species is unknown at the moment. However, as inferred from the presence of cephalic setose tufts at the posterolateral margins of the head and glabrous body, which are typical character states shared by a number of allied genera that exclusively include myrmecophilous species, Lisubatrus dongzhiweii is likely an inquiline of ants as well.

Distribution. This species in currently known only from the type locality in Yunnan, southwestern China.

Etymology. The new species is dedicated to Zhi-Wei Dong, who collected the holotype.

Figures

Fig. 1. Habitus of Lisubatrus dongzhiweii gen. & sp. nov., male in dorsal (A) and dorsolateral (B) views. Scale bars: 0.5 mm.

Fig. 2. Morphological details of Lisubatrus dongzhiweii gen. & sp. nov., male. A – left antenna. B–C – head and pronotum, in dorsal (B), and lateral (C) views. D – right elytron. E – meso- and metaventrite. F – abdomen in dorsal view, showing tergites IV–VII. Scale bars: 0.3 mm in A, F; 0.2 mm in B–E.

Fig. 3. Morphological details of Lisubatrus dongzhiweii gen. & sp. nov., male. A – tergite VIII. B – sternite VIII. C–E – aedeagus, in dorsal (C), lateral (D), and ventral (E) views. Scale bars: 0.2 mm.