Fissocantharis acuticollis Y. Yang & X. Yang

Yang, Yuxia, Su, Junyan & Yang, Xingke, 2014, Taxonomic note and description of new species of Fissocantharis Pic from China (Coleoptera, Cantharidae), ZooKeys 443, pp. 45-59 : 49-53

Taxon classification Animalia Coleoptera Cantharidae

Fissocantharis acuticollis Y. Yang & X. Yang sp. n. Figs 2, 5, 10, 20‒22

Type material.

Holotype ♂ (MHBU): CHINA: Zhejiang: 1Taishun, Wuyanling, 28.VII‒3.VIII.2005, leg. Y.B. Ba. Paratypes: 1♀ (MHBU): same data as the holotype; 1♀ (MHBU): same data, 2.VIII.2005; 1♀ (MHBU): same data, 31.VII.2005; 1♀ (IZAS): Qingyuan, Baishanzu, 800m, 14.VIII.1993, leg. H. Wu. Guangdong: 1♀ (SYSU): Xinfeng, 10.VII.1991, leg. R. Zeng; 1♂ (SYSU): same locality, 8.VII.1991, leg. Q.Z. Ye; 1♀ (SYSU): same locality, 9.VII.1991, leg. R. Chen; 1♂ (SYSU): same locality, 9.VII.1991, leg. Z.Y. Weng; 1♂ (SYSU): same data, 8.VII.1991; 1♂ (SYSU): Fengkai, Heishiding, 18.‒22.VII.2007, leg. L. Shi; 1♂ (SYSU): same locality, 4.VII.1987, leg. S.X. Zhong; 1♀ (SYSU): same locality, 12.VII.1999, leg. J.N. Yang; 1♀ (IZAS): Ruyuan, Nanling Nature Reserve, Ruyang Reserve Station, 1030‒1420m, 20.VII.2008, leg. G.Y. Yang. Hunan: 1♂ (IZAS): Shennong Valley, Shennong Waterfall, 600‒900m, 7.VII.2008, leg. X.Y. Zhu & Z. Yang; 1♀ (IZAS): Yanling, Shidu, Taoyuandong, 868m, 26. 478°N, 114.04°E, 7.VII.2008, T.Y. Jiao; 1♂ (IZAS): Yizhang, 14.‒15.VII.2008, leg. R.R. Wang & L. Ding (above all transliterated from Chinese labels). Fujian: 1♂ (NHMB): "Guatun, Fukien, China, 8.V.1946 (Tschung Sen.)"; 1♀ (NHMB): "Yen-ping, China, 2.VII.1917, Ac. 5148".

Description.

Male (Fig. 2). Body black, clypeus and mouthparts except maxillary and labial palpi dark brown, pronotum and elytra yellowish brown.

Head subquadrate, evenly narrowed behind eyes, dorsum nearly flat, with a indistinct middle longitudinal line, each side with a small transverse impression behind antennal socket, head surface densely and finely punctate, semilustrous, covered with sparse, fine, yellowish brown decumbent pubescence; eyes moderately protruding, head width across eyes nearly as wide as anterior margin of pronotum; terminal maxillary palpomeres nearly long-triangular, almost obliquely truncate at apical one-third length of inner margin; antennae (Fig. 10) extending to basal one-third length of elytra, antennomeres II nearly as long as wide at apices, III‒XI distinctly thickened, III‒X widened apically, III nearly as long as wide at apices, IV slightly longer than III, VI longest, apical parts of IV, the whole length of V‒X and basal parts of XI with longitudinal deep grooves along outer margins (Figs 10a, b), XI nearly parallel-sided and pointed at apex.

Pronotum nearly trapeziform, distinctly wider than long, widest at posterior margin, anterior margin slightly arcuate, anterior angles obtusely rectangular, lateral margins nearly straight, strongly diverging posteriorly, posterior angles triangular and sharp, posterior margin nearly straight and narrowly bordered, slightly emarginated in middle, disc strongly convex on posterolateral parts, with a distinct median longitudinal groove, surface finely imbricate-punctate, matt, covered with dense, fine, yellowish brown decumbent pubescence.

Elytra about 4.0 times longer than pronotum, 2.5 times longer than humeral width, which about one-third wider than posterior margin of pronotum, outer margins slightly diverging posteriorly, disc surface rugulose-lacunose, densely and coarsely punctate, matt, covered with dense, short and decumbent reddish brown pubescence, combined with much sparser, longer, semierected pubescence, elytral venation moderately developed.

All claws bifid, the lower claws slightly shorter than upper ones on all claws.

Abdominal sternite IX nearly triangular at apex. Aedeagus (Figs 20‒22): ventral process of each paramere bent inwards and rounded at apex, with a triangular protuberance at inner margin; conjoint dorsal fig of parameres nearly as long as ventral processes, distinctly roundly emarginated in middle of apical margin, lateroapical angles rounded; middle node of basal pieces strongly diverging apically.

Female. Similar to males, but antennae slightly thickened, without longitudinal grooves on antnnomeres VI‒ XI. Head width across eyes distinctly narrower than anterior margin of pronotum. All claws with lower claws distinctly shorter than upper ones. Abdominal sternite VIII (Fig. 5) largely truncate at apex, bisinuately emarginated on each side of posterior margin. Internal reproductive organ of genitalia (Figs 20‒ 22): vagina tapered and extended apically as a long duct; diverticulum and spermathecal duct arising from the end the long duct of vagina; diverticulum moderately long, thin and spiral; spermathecal duct distinctly shorter and slightly thicker than diverticulum; spermatheca much longer than diverticulum, provided with moderately long and thin accessory gland, distinctly shorter than spermatheca.

Body length: 9.0‒11.0 mm; width: 2.3‒3.0 mm.

Diagnosis.

This species is similar to Fissocantharis kontumensis Wittmer, but differs from the latter by the characteristic antennae of the male with apical parts of antennomeres IV and the whole length of V with longitudinal grooves along outer margins; pronotum distinctly wider than long, with triangular and sharp posterior angles, disc strongly convex on posterolateral parts; aedeagus: ventral process of each paramere with inner margins distinctly protuberant in middle, conjoint dorsal fig of parameres nearly as long as ventral processes, roundly emarginated in middle of apical margin, with rounded lateroapical angles.

Distribution.

China (Zhejiang, Fujian, Guangdong, Hunan).

Etymology.

The specific name is derived from the Latin acutus (acute) and collum (neck), referring to its pronotum with triangular and sharp posterior angles.

Remarks.

Some specimens are variable, with head almost yellowish brown, pronotum and elytra more or less darkened, elytral venation hardly visible.