Lycocerus guangxiensis Y. Yang et Liu, 2021

Xi, Huacong, Wang, Younan, Yang, Xingke, Liu, Haoyu & Yang, Yuxia, 2021, New species and taxonomic notes on Lycocerus hickeri species-group (Coleoptera Cantharidae), Zootaxa 4980 (3), pp. 541-557 : 546-548

Lycocerus guangxiensis Y. Yang et Liu , sp. nov.

Figs 3 A –B , 5A–C, 6C, 7C

Type material. Holotype: ♂ ( MHBU), China, Guangxi, Wuming, Damingshan , 1100 m, 27.v.2011, leg. H. Y. Liu. Paratypes: China, Guangxi: 5♀♀ ( MHBU), same data as holotype ; 1♀ ( MHBU), Wuming, Damingshan, 1230–1423 m, 20.v.2011, leg. H. Y. Liu.

Description. Male ( Fig. 3A ). Body black, mandibles dark brown, pronotum red, with a large dark brown marking in center of disc, elytra red, darkened at the whole length of all elytral interstices. Body densely covered with short, decumbent black pubescence, mixed with brown pubescence on head, pronotum and elytra, of which slightly longer on elytra.

Head evenly narrowed behind eyes, surface densely and finely punctate; eyes distinctly protruding, head width across eyes distinctly wider than anterior margin of pronotum; terminal maxillary palpomeres long-triangular, arcuate and sharp at apical half-length of inner margins; antennae almost reaching apices of elytra when reclined, antennomere II shortest, slightly longer than wide of apices, III ‒ XI dorso-ventrally flattened, III ‒ VIII obliquely widened apically, long-triangular, III about twice as long as wide at apices, IV widest and slightly longer than III, IV‒XI each with an oval to round smooth impression at apical or middle part of inner margin, VIII longest, IX ‒ XI nearly parallel-sided, XI slightly longer than X and pointed at apices.

Pronotum about 1.2 times longer than wide, widest at base, anterior margin rounded, lateral margins slightly diverging posteriorly, posterior margin slightly arcuate and narrowly bordered, anterior angles rounded, posterior angles rectangular, disc moderately convex at postero-lateral parts, surface semillustrous, punctate like that of head.

Elytra about 4.5 times longer than pronotum, 3.3 times longer than humeral width,which about 1.5 times wider than posterior margin of pronotum, lateral margins nearly parallel, apices rounded, elytra venations strongly developed and costate, disc matt, wrinkled, sparsely and very finely punctate.

Legs slender, all tarsal claws simple.

Aedeagus (Figs 5A–C): ventral process of each paramere feebly bent inwards in ventral view and bent dorsally in lateral view, with apex rounded; dorsal plates shorter than ventral processes, with inner margins diverging posteriorly, apical margins straight, inner apical angles subrounded, outer apical angles rectangular in lateral view; laterophyse feebly shorter than dorsal plate, with apex acutely hooked, directing outwards and opposite to outer apical angle of dorsal plate.

Female ( Fig. 3B ). Similar to the males, but body larger; eyes less protruding, anternnae narrower and shorter, extending to elytral mid-length when reclined, IV‒XI without impressions; pronotum nearly as long as wide; pro- and meso-outer and inner tarsal claws each with a digitiform tooth at base.

Abdominal sternite VIII ( Fig. 6C ) shallowly and roundly emarginate on both sides and in middle of posterior margin, lateral emarginate parts as shallow as the middle one, between which the portion acute at apex, latero-apical angles acute at apex, which on the same horizontal line as the portion between lateral and middle emarginate parts.

Internal organ of reproductive system ( Fig. 7C ): vagina stout and abruptly thinned at ventroapical portion into a stout tube, where diverticulum and spermathecal duct arising separately; diverticulum moderately long, thinned apically and spiral; spermathecal duct shorter and much thicker than diverticulum; spermatheca provided with a spiral tube, gradually thinned apically, longer than diverticulum; basal portion of spermatheca extended into a short thick tube, where accessory gland opening; accessory gland thin and nearly as long as spermatheca.

Body length: 9.0–11.0 mm (9.0 mm in holotype); width: 2.0 ‒ 2.4 mm (2.0 mm in holotype).

Etymology. The specific name is derived from its type locality: Guangxi Zhuang Autonomous Region, China.

Diagnosis. It is related to L. quadrilineatus Y. Yang et X. Yang, 2014 (located in Vietnam: Sa Pa), but differs in the longer male antennae that almost reach apices of elytra when reclined, the longer pronotum, about 1.2 times as long as wide, elytra tapered at apices in male. The aedeagus has the dorsal plates of parameres with inner margins diverging posteriorly at apical part. Unlike the new species, L. quadrilineatus has the antennae extending to apical one-fourth length of elytra, pronotum hardly longer than wide, elytra rounded at apices, and dorsal plates of parameres with nearly parallel inner margins. Female has the abdominal sternite VIII moderately deeply and roundly emarginate in middle of posterior margin, spermatheca is gradually thinned apically, diverticulum is thick at base and gradually thinned apically. For comparison, L. quadrilineatus has the abdominal sternite VIII hardly emarginate in middle, spermatheca is abruptly thinned apically, and diverticulum is uniformly thin in the whole length.

Distribution. China (Guangxi).

Figures

FIGURE 3. Habitus of Lycocerus guangxiensis sp. nov., dorsal view: A. male; B. female. Scale bars: 2.0 mm.

FIGURE 6. Abdominal sternite VIII of female, ventral view: A. Lycocerus nigrobilineatus Pic, 1916; B. L. mainriensis sp. nov.; C. L. guangxiensis sp. nov.; D. L. rufipennis sp. nov. Scale bars: 0.5 mm.

FIGURE 7. Female internal genitalia, lateral view: A. Lycocerus nigrobilineatus Pic, 1916; B. L. mainriensis sp. nov.; C. L. guangxiensis sp. nov.; D. L. rufipennis sp. nov. Scale bars: 0.5 mm.