Cyrebion gracilicornis, Yang & Yang, 2010

Yang, Y. X. & Yang, X. K., 2010, A redescription of the genus Cyrebion Fairmaire, 1891, with notes on related taxa and distribution (Coleoptera: Cantharidae), Journal of Natural History 44 (9 - 10), pp. 579-588 : 585-587

publication ID	https://doi.org/ 10.1080/00222930903383586
persistent identifier	https://treatment.plazi.org/id/03C54D38-512C-FFEC-FDA6-2262FC48FB77
treatment provided by	Felipe
scientific name	Cyrebion gracilicornis
status	sp. nov.

Treatment

Cyrebion gracilicornis sp. nov.

( Figures 1E,F View Figure 1 , 2F–I View Figure 2 )

Male ( Figure 1E View Figure 1 )

Body length from apex of clypeus to apices of elytra 9.9 mm, maximal breadth at elytra 3.0 mm. Head behind antennal sockets black, with a narrow, longitudinal yellow band in middle, frons and ventral side yellow, mouthparts yellow, apical maxillary palpomeres and apices of mandibles brown, antennae black, antennomeres I–IV yellow ventrally; pronotum yellow, brown in middle of anterior margin, each side of posterior parts with a large irregular brown marking, behind it with a smaller one; scutellum dark brown, elytra black; thoracal meso- and metasternites and abdomen yellow; legs black, coxae and bases of femora yellow. Body densely covered with black pubescence, mixed with yellow pubescence on yellow area.

Head. Eyes moderately protruding, breadth across eyes slightly wider than anterior margin of pronotum, surface finely and densely punctuated, a pair of indistinct impressions behind antennal sockets; antennae extending to middle of elytra, slightly thickened, antennomere II twice as long as wide, antennomere IV longest, antennomeres IV–XI each with a narrow glabrous groove near apex of inner margin.

Pronotum. About 1.3 times wider than long, disc slightly convex in middle, densely and finely punctuated.

Elytra. Widest at humeri, about 2.5 times longer than wide, four times longer than pronotum, breadth at humeri one-third wider than posterior margin of pronotum, lateral margins distinctly converging posteriorly, disc densely and slightly largely punctuated.

Aedeagus ( Figure 2F–H View Figure 2 ). Dorsal plates of parameres with apical margin widely emarginated in middle, lateral angles slightly angled and bent ventrally, ventral process of each paramere distinctly depressed in middle of posterior half, laterophyses with apices slightly angled and bent dorsally.

Female ( Figure 1F View Figure 1 )

Body slightly larger than that of male; eyes less protruding than in male, head breadth across eyes as wide as anterior margin of pronotum; antennae slightly shorter than in male, middle antennomeres without glabrous grooves; elytra slightly converging posteriorly. Abdominal sternite VIII widely and roundly emarginated in middle, with a longitudinal ridge on each side of the middle emargination, covered with slightly long and stout setae on ridges and along lateral margins ( Figure 2I View Figure 2 ).

Variation in type series

Sometimes pronotum mostly yellow, without small brown markings behind large ones. Body length: 8.5–13.3 mm, breadth: 2.7–3.5 mm.

Type material

Holotype male, China, Hubei, Xingshan, Longmenhe , 1400 m, 24 July 1993, B. W. Sun leg. Paratypes: one female, Hubei, Xingshan, Longmenhe , 1670 m, 23 July 1993, B. W. Sun leg. ; one male, Gansu, Kangxian, Heimaguan , 1450–1550 m, 13 July 1998, D. C. Yuan leg. ; one female, Shaanxi, Liubamiao, Taizi , 1350 m, 21 July 1998, J. Yao leg. (holotype and all paratypes in IZAS) .

Distribution

China (Gansu, Shaanxi, Hubei) .

Etymology

The specific name is derived from Latin gracilis + cornu = slender + antenna, referring to its slender antennae.

Remarks

This new species is similar to C. laticorne in body coloration, but differs in the slightly thickened antennae, narrower pronotum and different emargination of female abdominal sternite VIII. From C. subrufolineatus , it can be easily distinguished by the body coloration.

Distribution of Cyrebion Fairmaire

All of the known species are distributed in China, where they are restricted to the south-western area ( Figure 3 View Figure 3 ). Judging from the current distribution pattern, we suppose that this genus may not be endemic to China, instead, more unknown species should exist within the Oriental region, especially in the adjacent area of south-west China. We hope that this study will initiate the recognition of this genus, with more and more species discovered by extensive investigations in future.