Rhagonycha guizhouensis Y. Yang, Liu & X. Yang 2024, sp. nov.
Creators: name: Xiao, Yun-Feng
name: Liu, Hao-Yu
name: Yang, Xing-Ke
name: Yang, Yu-Xia
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cantharidae
Rhagonycha
Rhagonycha guizhouensis

description: Rhagonycha (s.str.) guizhouensis Y. Yang, Liu & X. Yang, sp. nov.
(Figs 29D, 30D, 31C‒D, 32D‒F, 36)
Type material. HOLOTYPE: ♂ (IZAS), CHINA, Guizhou: Fanjingshan, 5.IV.2000, leg. C.S. Wu. PARATYPE: CHINA, Guizhou: 1♀ (IZAS), same data as the holotype.
Differential diagnosis. It looks similar to Rh. flavimima sp. nov. in the general shape of aedeagus, but can be distinguished from the latter by the following characters: femora uniformly yellow, while bicolored and black dorsally in Rh. flavimima sp. nov.; pronotum with a black rounded spot in center of disc, while with a black longitudinal median band in Rh. flavimima sp. nov. (Fig. 19A, B); aedeagus: conjoint dorsal plate of parameres feebly bent ventrally in lateral view, with the middle emargination nearly as deep as that between conjoint dorsal plate and ventral process, while strongly bent ventrally, with the middle emargination shallower in Rh. flavimima sp. nov. (Fig. 20C); ventral process of each paramere wider and acute at apex, with a small-triangular protuberance along dorsal margin in lateral view, while narrower and narrowly rounded at apex, without any protuberance in Rh. flavimima sp. nov. (Fig. 20C).
Description. Body length: 7.4‒8.4 mm (7.4 mm in holotype); width: 2.0‒ 2.4 mm (2.0 mm in holotype).
Male (Fig. 31C). Coloration. Body black except for the following parts: head yellowish orange but black at vertex, pronotum yellowish orange, with a black marking before center and feebly darkened at posterolateral parts of disc, femora, coxae and trochanters yellowish orange, elytra pale yellow, each elytron with a wide longitudinal median black band that extending behind humerus to apex and and narrower in the anterior part than the posterior part. Surface sparsely and finely yellow pubescent, anterior margin of clypeus fringed with pale bristles.
Head rounded, surface densely and finely punctate; eyes moderately protruding, head width across eyes about 1.1 times pronotum; terminal maxillary palpomeres subtriangular, widest at apical third; antennae extending to basal 3/4 length of elytra when reclined, antennomeres II shortest, about 1.7 times as long as wide at apices, III about 3.3 times longer than II, VII longest, XI feebly longer than X and pointed at apices.
Pronotum transverse, about 1.1 times as long as wide, anterior margin rounded, anterior angles subrounded, lateral margins feebly diverging posteriorly, posterior margin nearly straight, posterior angles sub-rectangular, disc strongly convex on posterolateral parts, surface finely and sparsely punctate.
Elytra with lateral margins feebly diverging posteriorly, about 3.1 times as long as humeral width, 5.1 times longer than pronotum, surface finely rugulose-lacunose, almost lustrous at basal parts.
Aedeagus moderately swollen laterally in middle (Fig. 32D); ventral processes of parameres abruptly thinned apically near bases, slender and even in width, bent to each other in ventral view (Fig. 32D), moderately wide and bent dorsally in lateral view, acute at apices, with a small-triangular protuberance in middle of dorsal margin (Fig. 32F); conjoint dorsal plate of parameres distinctly shorter than ventral processes (Fig. 32F), with apical margin triangularly and moderately deeply emarginate in middle, lateral margins moderately diverging apically, latero-apical angles acute in dorsal view (Fig. 32E), and feebly bent ventrally in lateral view (Fig. 32F); emargination between ventral process and conjoint dorsal plate about 1/4 length of aedeagus (Fig. 32F).
Female (Fig. 31D). Similar to male, but with larger and stouter body, antennae thinner, head width across eyes about as wide as anterior margin of pronotum, pronotum wider and about 1.2 times as wide as long, anterior margin less arcuate, lateral margins nearly parallel-sided, disc feebly convex on posterolateral parts, elytra yellowish brown at humeri, about 3.0 times as long as humeral width, with lateral margins moderately diverging posteriorly.
Internal organ of reproductive system (Fig. 29D): vagina stout and abruptly thinned at ventroapical portion into a short and feebly stout tube, where diverticulum and spermathecal duct arising separately; diverticulum short and spiral, progressively thinned apically; spermathecal duct short and about 1/3 length of apical tube of vagina; spermatheca provided with a spiral tube, progressively thinned apically and obviously longer than diverticulum; accessory gland moderately long, about 1.5 times as long as spermatheca.
Abdominal sternite VIII (Fig. 30D) moderately narrowed posteriorly, acute at latero-apical angles, and arcuately emarginate on both sides of posterior margin, with the portion between lateral emarginations arcuate at apex and not reaching apices of latero-apical angles.
Etymology. The specific name is derived from the name of the type locality, Guizhou, China.
Distribution (Fig. 36). China (Guizhou).
description: Published as part of Xiao, Yun-Feng, Liu, Hao-Yu, Yang, Xing-Ke & Yang, Yu-Xia, 2024, Taxonomic review of the Rhagonycha flava species group (Coleoptera, Cantharidae), with descriptions of fourteen new species from China, pp. 1-69 in Zootaxa 5534 (1) on pages 51-53, DOI: 10.11646/zootaxa.5534.1.1, http://zenodo.org/record/14023514