Ancystrocerus lueliangi Yin 2020, sp. nov.
Creators: name: Yin, Zi-Wei
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Ancystrocerus
Ancystrocerus lueliangi

description: Ancystrocerus lueliangi sp. nov.Fig. 1 Type material. <b> <i>Holotype</i>: China</b> : &amp;male;, 'China: Yunnan, Yingjiang Co. (盈江县), Tongbiguan N. R. (铜壁关自然保护区), 24.6136444N, 97.5851155E, 1255 m, 28.viii.2019, Liang Lü leg.' (SNUC). Diagnosis. <b>Male.</b> Length 2.4 mm (combined length of head, pronotum, elytra and abdomen). Head and pronotum roughly punctate. Antennomeres 4 and 5 subequal in length, 9 and 10 expanded laterally, apex of antennomeres 9 and base of antennomeres 10 obliquely constricted, each with one bunch of bristles. Pronotum with small, conical discal spine. Tergites 1 and 2 (IV and V) with median carina extending through entire tergal length. Aedeagus relatively more slender, median lobe symmetrical in dorso-ventral view; endophallus with single long sclerite and two pairs of short sclerites; parameres each elongate and with two long apical setae. Description. <b>Male</b> (Fig. 1A). <i>Length</i> 2.4 mm. <i>Head</i> (Fig. 1B) slightly longer than wide, length from anterior margin of clypeus to posterior margin of vertex (excluding occipital construction) 0.51 mm, width across eyes 0.43 mm; dorsal surface roughly punctate; postocular margins with dense tufted hairs; eyes prominent, each composed of about 35 facets. <i>Antennae</i> (Fig. 1C) elongate, with clubs (Fig. 1D) formed by apical three antennomeres; scapes large, antennomeres 2 smaller than scapes, antennomeres 3-8 each subquadrate, 8 slightly transverse and larger than each of antennomeres 2-7, antennomeres 9-10 modified, antennomeres 11 largest, elongate, widest at middle. <i>Pronotum</i> (Fig. 1B) slightly longer than wide, length along midline 0.56 mm, maximum width 0.52 mm, roughly punctate, disc with small, acute denticle at middle. <i>Elytra</i> much wider than long, length along suture 0.66 mm, maximum width 0.87 mm; shallow and broad discal striae extending posteriorly to past half of elytral length. <i>Legs</i> simple, elongate. <i>Abdomen</i> wider than long, length along midline 0.66 mm, maximum width 0.87 mm. <i>Tergite</i> 1 (IV) approximately as long as tergite 2 (V), both tergites with entire and distinct median carina. Length of aedeagus (Fig. 1E, F) 0.47 mm, elongate, well sclerotized; median lobe curved ventrally at apex in lateral view; endophallus composed of one elongate sclerite at middle and two short and strongly sclerotized sclerites at apex; parameres elongate and flattened, each with two long setae at apex. <b>Female.</b> Unknown. Comparative notes. Males of the new species can be readily separated from <i>A. chinensis</i> and all other congeners by the roughly punctate head and pronotum, and the different shape of antennomeres 9-10 and structure of the aedeagus. <i>Ancystrocerus chinensis</i> from Hainan has finely punctate head and pronotum, the antennomeres 9 and 10 more elongate, and aedeagus much more robust and with a large projection at the apex of the median lobe. Distribution. China: Yunnan. Biology. The single male was sifted from a leaf litter sample in a shady broad-leaved forest. Etymology. The new species is named after Liang Lü, collector of the holotype.
description: Published as part of <i>Yin, Zi-Wei, 2020, Two new species of Ancystrocerus Raffray from the Oriental region (Coleoptera, Staphylinidae, Pselaphinae), pp. 29-34 in ZooKeys 958</i> on page 29, DOI: 10.3897/zookeys.958.54196