Hexarhopalus (Hexarhopalus) tianbaoyanensis Jiang & Zhou & Liu & Huang & Chen 2022, sp. nov.
Creators: name: Jiang, Ri-Xin
name: Zhou, Qing-Hua
name: Liu, Yi-Feng
name: Huang, Yu-Zhou
name: Chen, Xiang-Sheng
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Tenebrionidae
Hexarhopalus
Hexarhopalus tianbaoyanensis

description: Hexarhopalus (Hexarhopalus) tianbaoyanensis sp. nov.
(Figs 1B–C, 3, 5A–B)
Type material. Holotype: CHINA: ♂, labeled ‘China: Fujian, Sanming City (三fi市), Tianbaoyan N. R. (RDz岩 h然保护区), 01.VIII.2020, H: 1500m, Guoliang leg.’ (MHBU). Paratype: CHINA: ♀, labeled ‘China: Fujian, Fuzhou City (dz州市), Youxi County (尤ê县), Daopaiyan (倒fl岩ǟ区), 03,IV,2021, Liu Yi-Feng leg.’ (MHBU).
Description. Male (Figs 1B, 3A–H): Body long oval, convex, dark brown, dorsal surface dull-shiny.
Head (Fig. 3A) transverse, widest across compound eyes. Vertex finely covered with small punctures and each puncture bearing a short, thin seta. Genae and epistoma covered with denser punctures and setae relative to punctures and setae on vertex. Labrum reddish brown, narrower than epistoma, covered in apical portion with bristles of medium length. Antennal tubercles weakly prominent, antenna (Fig. 3C) longer than head plus pronotum, club composed of four apical antennomeres. Relative lengths of antennomeres: 0.46: 0.23: 0.76: 0.72: 0.74: 0.73: 0.70: 0.63: 0.53: 0.51:0.65; relative widths of antennomeres: 0.29: 0.24: 0.26: 0.28: 0.27: 0.30: 0.31: 0.36: 0.35: 0.35: 0.42. Antennomere I slightly expanded; antennomere II shortest, about as long as wide; antennomere III longest, more than twice as long as antennomere II, antennomeres IV–VI similar, shorter than antennomere III, antennomere VII distinctly expanded near apex, antennomere VIII about twice as long as wide, distinctly expanded near apex, antennomeres IX–X similar, longer than wide and expanded near apices, antennomere XI with apex rounded.
Pronotum (Fig. 3A) about as long as wide, widest at middle; dorsal surface covered with dense small punctures and short setae; mediolongitudinal sulcus thin and not obvious, both sides with a shallow depression; pronotal groove thin but obvious basally, absent in middle of anterior part, thin but deep at lateral margin (Fig. 3B). Prosternum distinctly raised before procoxae, surface wrinkled with sparse short setae; apex of prosternal process rounded.
Elytra long ovoid, more than 1.5× longer than wide in dorsal view, humerus strongly narrowed, widest at apical 1/3, disc with regular rows of strong foveolate punctures; scutellum transverse, nearly triangular; wings completely reduced.
Metaventrite and abdomen finely covered with short thin setae and dense small punctures; median sulcus distinct, extending from anterior margin to ca. 2/3 of metaventrite length. Abdominal ventrite I longest, shorter than combined lengths of ventrites III and IV, wrinkled basally; ventrite II slightly longer than metaventrite III; metaventrites III and IV distinctly concave; ventrite V slightly shorter than combined lengths of ventrites III and IV, apex rounded; apical margin of abdominal ventrite VIII (Fig. 3D) medially impressed, posterior and lateral margins bearing long setae.
Femora claviform medially, strongly expanded in distal halves; all tibiae covered with brown setae apically; pro- and mesotibiae slightly curved, metatibia straight; tarsomeres simple, apical pro- and mesotarsomeres shorter than combined lengths of proximal four tarsomeres, apical metatarsomere shorter than combined lengths of proximal three metatarsomeres.
Aedeagus (Figs 3F–H) symmetrical in dorsal view, distinctly curved in profile; spiculum gastrale (Fig. 3E) asymmetrical, short, with large apical lobes.
Measurements: BL 16.6 mm, HL 2.3 mm, HW 2.9 mm, PL 4.9 mm, PW 4.4 mm, EL 9.4 mm, EW 5.5 mm.
Female (Fig. 1C): Similar to male. Posterior margin of ventrite VIII (Fig. 3I) rounded and covered with sparse long setae. Spiculum (Fig. 3I) nearly straight, apex rounded and slightly dilated. Apex of ovipositor (Fig. 3J) with a long and two short setae.
Measurements: BL 16.3 mm, HL 2.2 mm, HW 2.8 mm, PL 4.6 mm, PW 4.1 mm, EL 9.5 mm, EW 5.6 mm.
Differential diagnosis. In general habitus the new species most closely resembles H. (H.) sculpticollis Fairmaire, 1891 from Zhejiang, with both species having a long-oval body and a pronotum with a pair of shallow impressions. However, H. (H.) tianbaoyanensis sp. nov. can be separated from the latter species by the different form of the aedeagus: lateral margin of lobes are straight in H. (H.) sculpticollis, while distinctly wavy in the new species.
Distribution. China: Fujian.
Biology. Adults of this species were collected on tree trunks at night, while during the day they are hidden under tree bark and difficult to find (Figs 5A–B).
Etymology. The specific epithet refers to the type locality, Tianbaoyan Nature Reserve, Fujian Province; the name is treated as an adjective.
description: Published as part of Jiang, Ri-Xin, Zhou, Qing-Hua, Liu, Yi-Feng, Huang, Yu-Zhou & Chen, Xiang-Sheng, 2022, Additional new species of the genus Hexarhopalus Fairmaire, 1891 (Coleoptera, Tenebrionidae: Cnodalonini) from China, pp. 592-600 in Zootaxa 5141 (6) on page 596, DOI: 10.11646/zootaxa.5141.6.5, http://zenodo.org/record/6598173