Oxytelus solus, Lü & Zhou, 2012

Lü, Liang & Zhou, Hong-Zhang, 2012, 3576, Zootaxa 3576, pp. 1-63 : 48-49

Oxytelus solus sp. nov.

( Figs. 18A–J)

Type material. Holotype: male, CHINA: Sichuan, Wolong, Wuyipeng, Yuancaodi , 2450m, in untouched birch forest, pitfall trap, 1–4.V.2004, Xiao-Dong Yu leg. ( IZ-CAS).

Description. Body black. Maxillary palpi, first 4 antennomeres, elytra, and legs testaceous. Length male, 6.6 mm.

Male. Head ( Fig. 18A) widest at eyes or temples. Disc densely punctate, nearly glabrous. Clypeus transverse, as long as 1/3 head length, depressed centrally, surface glabrous, coriaceous, and sparsely punctate near anterior margin; anterior margin with two teeth near middle, a little beyond anterior margin of supra-antennal ridges. Epistomal suture with lateral portions running backward to level of anterior margin of eyes. Vertex densely punctate, slightly convex, posterior part poorly-limited; mid-longitudinal suture invisible, punctate paralateral sutures running anteriorly over level of posterior margin of eyes. Eyes with fine facets, shorter than temples. Temples broadly rounded and dilated. Occipital suture with middle portion absent; nuchal ridge discontinuous in middle and extending to lateral plate, dorsal basal ridge present.

Mandible ( Fig. 18B) robust and curved; two denticles on inner edge, one near middle and one at apical 1/4. Antenna (type I) shorter than head and pronotum together, with apical antennomere shorter than two preceding together.

Pronotum transverse, broadest at about anterior 1/3, broader than head. Disc 5-sulcate (as Fig. 1I), median sulcus and two paramedial sulci deep and punctate; two paralateral sulci straight and short, not so deep as former. Lateral margins even, crenulate around posterolateral angles, posterolateral angles prominent. Elytra punctate and striate, without lateral longitudinal ridge.

Abdomen coriaceous and pubescent, broadest at segment V. Sternite VII ( Fig. 18C) with two denticles near middle of posterior margin, between which weakly emarginate. Sternite VIII ( Fig. 18D) with subbasal ridge continuous and curved backward in middle, with posterior margin broadly emarginate, furnished with two teeth, between which with membranous border and bearing two fine denticles in middle. Tergite X ( Fig. 18E) longer than wide, posterior margin slightly emarginate, with two lines of setae on haired posterior part.

Aedeagus extremely complicated ( Figs. 18F–J). Median lobe oblong-ovoid, a little broadened basally, with sclerite-like or membranous structures inside; apico-medial hook with apical part highly developed, spirally twisted, sharply edged, and pointed and downcurved at tip, basal part obsolete and deeply rooted into ventral surface of median lobe; dorsal membranous area covering less than half of dorsum. Paramere arm-like, with ventrally directed seta at apical 1/3 and dorsal process at near apex, with shallow furrow on basal arm.

Female. Unfound.

Distribution. China (Sichuan).

Etymology. The specific epithet is a Latin adjective solus , referring to the fact that this species is published with unique type specimen.

Remarks. This species is easily recognized by the asymmetrical and spiraling apico-medial hook of the median lobe. It is also different from the congeneric members by its large and robust body, transverse and depressed clypeus with two teeth on anterior margin, and distinct shape of the posterior margin of male sternite VIII.