Themus (Haplothemus) longideverticulum Yang & Liu & Yang 2018, sp. nov.
Creators: name: Yang, Yuxia
name: Liu, Haoyu
name: Yang, Xingke
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cantharidae
Themus
Themus longideverticulum

description: Themus (Haplothemus) longideverticulum Y. Yang et X. Yang, sp. nov.
Figs 6, 22‒24, 29, 34
Type material. Holotype, male (IZAS): CHINA, Yunnan, Nujiang, Gongshan, Dulong, Maku vill., 27.4112°N 98.1630°E, 1228m, 24.IV.2015, leg. M.Y. Lin. Paratypes: 3 males, 2 females (IZAS): same data as the holotype. Distribution. China (Yunnan).
Description. Male (Fig. 6). Head dark blue, with weak metallic shine, dark brown in center of dorsum and two sides of clypeus, mouthparts light brown, darkened at labial and maxillary palpomeres and apices of mandibles, antennae black, prothorax light yellow, pronotum with a slightly large semi-round and a small round black markings on each side of disc and near middle line, the former nearly in center and the latter behind the former and before posterior margin, scutellum dark blue, with weak metallic shine, elytra dark brown, each with a dark green longitudinal bands in middle, which with weak metallic shine and extending from humeri almost to apex, legs dark blue, with weak metallic shine, dark brown at ventral sides of pro- and mesocoxae, the whole metacoxae, all trochanters and ventral sides of basal parts of tibiae, meso- and metasterna dark blue, with weak metallic shine, abdomen orange, each side with an irregular dark blue marking on abdominal ventrites except the terminal two, the markings with weak metallic shine. Body densely covered with decumbent brown pubescence, mixed with slightly long, semi-erected pubescence on elytra and a few long hairs along anterior margin of clypeus.
Head rounded, densely and finely punctate, surface lustrous; eyes distinctly protruding, head width across eyes slightly wider than anterior margin of pronotum; terminal maxillary palpomeres nearly long-triangular, widest at basal two-fifths length, with outer margins slightly arcuate, inner apical margins slightly sharp and apices acute; antennae slightly thickened, almost extending to basal three-fifths length of elytra, antennomeres II about 3.0 times as long as wide, III slightly shorter than II, IV about one-third longer than III, V longest, V‒X gradually shortened and narrowed one by one, XI slightly longer than X and pointed at apices, IV‒IX each with a small round to narrow short longitudinal impression near middle of outer margin.
Pronotum subquadrate, about 1.1 times as wide as long, anterior margin arcuate, lateral margins nearly parallel, posterior margin nearly straight and narrowly bordered, anterior and posterior angles nearly rectangular, disc moderately convex at postero-lateral parts, slightly sparsely and finely punctate, surface lustrous.
Elytra about 5.0 times longer than pronotum, 3.2 times as long as humeral width, with lateral margins nearly parallel, disc rugulose-lacunose and coarsely punctate, surface matt.
Aedeagus (Figs 22‒24): ventral process of each paramere slender and gradually narrowed apically, rounded at apex, nearly straight in ventral view; conjoint dorsal plate of parameres slightly shorter than ventral processes, with lateral margins slightly converging apically, apical margin widely and roundly emarginated in middle, latero-apical angles sub-rounded, each side with a transverse ridge near latero-apical angles of inner surface and; laterophyses compressed, separated on both sides of median lobe and slightly diverging from each other, acute and slightly hooked at apices, which pointed towards the lateroapical angles of conjoint dorsal plate.
Female. Similar to male, but eyes moderately protruding; antennae slightly thinner and shorter, almost extending to basal two-fifths length of elytra, antennomeres IV‒IX without impressions; pronotum about 1.2 times as wide as long; elytra about 3.1 times longer than humeral width.
Abdominal sternite VIII (Fig. 34) triangularly emarginated in middle and roundly emarginated on both sides of posterior margin, the middle emargination distinctly deeper and nearly as wide as the lateral one, the portion between middle and lateral emarginations nearly rectangular at apex.
Internal genitalia (Fig. 29): vagina stout, with diverticulum and spermatheca situated at apex, median oviduct at basal one-third part of ventral side; diverticulum very long and thick sac-shaped, about 2.5 times as long as vagina, moderately expanded apically, about 4.0 times as long as maximal width, rounded at apex; spermatheca short sac-shaped, about one-third length of diverticulum, slightly expanded apically and rounded at apex, and provided with a moderately long and thin accessory gland at basal one-third part; diverticulum and spermatheca surrounded with a strongly sclerotized ring at base, which is confluent in middle and extending to median oviduct on ventral side, the opening of spermatheca arising from middle of the sclerotized ring on dorsal side.
Body length (both sexes): 19.0‒20.0 mm; width: 4.0‒ 4.5 mm.
Diagnosis. This species is similar to T. (H.) cacharensis Champion, 1926 in the coloration, but differs in the aedeagus: laterophyses flattened and wide, adhere to middle of dorsal side of median lobe, conjoint dorsal plate of parameres smooth on inner surface, while in T. (H.) cacharensis, laterophyses slender, separated on both sides of median lobe, conjoint dorsal plate of parameres each side with a narrow transverse ridge near lateroapical angle on inner surface (see Wittmer 1973: figs 47, 48); abdominal sternite VIII of female roundly emarginated on both sides of posterior margin, the portion between the middle and lateral emarginations nearly rectangular at apex, while in T. (H.) cacharensis, bisinuately emarginated on both sides of posterior margin, the portion between the middle and lateral emarginations acute at apex (see Yang et al. 2012: fig. 5).
Etymology. The specific name is derived from the Latin longus (long) and deverticulum (diverticulum), referring to its extremely long diverticum of female genitalia.
description: Published as part of Yang, Yuxia, Liu, Haoyu & Yang, Xingke, 2018, A contribution to the knowledge of Themus (Haplothemus) Wittmer from China (Coleoptera: Cantharidae), pp. 241-253 in Zootaxa 4407 (2) on pages 250-252, DOI: 10.11646/zootaxa.4407.2.5, http://zenodo.org/record/1216378