Cybocephalus liui Tian

Tian, Mingyi, 2006, Checklist of the genus Cybocephalus Erichson (Coleoptera: Cybocephalidae) of China, with description of a new species from Yunnan Province, Zootaxa 1202, pp. 61-68 : 64-67

Cybocephalus liui Tian , n. sp.

Holotype: ɗ, Tongbiguan Natural Reserve, Yingjiang County, West Yunnan, 2005­VI­23, Liu Jingxian leg. Paratypes: 1ɗ2Ψ, same data as holotype. All type materials are deposited in the insect collection of South China Agricultural University, Guangzhou.

Description

Medium­sized, strongly shiny, surface punctured and setose, antennae with club (antennomeres 9–11) well defined and asymmetric; legs slender, fore tibiae with long setae along outer margins, males with metallic sheen on head and pronotum.

Length (not including the bent head): 1.4–1.5 mm; width: 1.0 mm. Habiti as in Figs. 1 and 3.

Elongate oval, strongly convex, with prothorax and head bent, head concealed dorsally.

Body dark brown, antennae, palpi of mouthparts and legs yellow to yellowish brown. Male with head, including base of mandible and anterior median portion of prothorax, bluish metallic sheen. Female similar to male, but without metallic sheen.

Head bent, convex, wider than long; frons distinctly protruding anteriorly, truncate at front margin, clypeus small, labrum concealed by clypeus; mandibles stout, sharp at apices, teeth developed, left mandible with a single tooth, right one with two; base of mandibles with several long setae; eyes large, somewhat elliptical, pointed in front but broadly rounded behind; in dorsal view the inner margins of eyes broadly arcuate interiorly while the outer ones slightly convex; apical joints of labial palpi subcylindrical, apical joints of maxillary palpi thick; genal corner pointed ( Fig. 2 ); antennae rather slender, well defined, 11­segmented, club strong, asymmetrical; antennomere 3 much longer than others, almost twice as long as antenommere 4; antennomeres 4–7 subequal in length, each longer than antennomere 8; antennomeres 2 to 8 each with a pair of setae, scape asetose; antennomere 8 shortest, longer than width; club segments setose, apical margin of antennomere 11 nearly truncate ( Fig. 4 ).

Pronotum strongly transverse, two times wider than length, markedly convex, lateral margins broadly lobed; median portion of anterior margin slightly convex; whole posterior margin broadly convex.

Elytra strongly convex, as long as combined width, lateral portions lobed and almost vertical, apical margins broadly rounded; suture line a little convex in lateral view. Scutellum rather large and wide.

Legs slender, fore tibia with apex slightly dilated; inner margin slightly sinuate at midlength, outer margin almost straight, subapical margin obliquely truncate, outer angle broadly rounded, apical margin narrow and nearly straight; long setae arranged along the outer margin ( Fig. 5 ).

Male genitalia. Structure of male genitalia normal for Cybocephalus , the basal plate ( Fig. 6 ) broadly flat, roundly but distinctly protruded at apex. Penis stout, pointed at apex ( Figs. 7–8 ).

Remarks

This new taxon is allied to C. chinensis Yu , but is easily separated from the latter by its fore tibia with outer angle broadly rounded, not angulate; the basal plate a little narrower, more protruded at apex, and setose around margins.

Figures

FIGURES 1 – 2. Cybocephalus liui n. sp. 1, 3. habiti (1. dorsal view, 3. lateral view), 2. head (dorsal view).

FIGURES 4 – 8. Cybocephalus liui n. sp. 4. antenna, 5. left fore tibia, 6. basal plate, dorsal view, 7. penis, dorsal view, 8. penis, lateral view. scale bar: 0.25 mm for figs. 3, 6 – 8; 0.5 mm for fig. 5.