Patrus jiangxiensis Liang & Angus & Jia 2021, sp. nov.
Creators: name: Liang, Zulong
name: Angus, Robert B.
name: Jia, Fenglong
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Gyrinidae
Patrus
Patrus jiangxiensis

description: Patrus jiangxiensis sp. nov.
urn:lsid:zoobank.org:act: 74887BE8-29AD-43F6-8E93-84770844D59C
Figs 1D–F, 4, 6B
Diagnosis
This species can be diagnosed by the following characters combined: 1) labrum less than ⅓ as long as wide, with anterior margin straight; 2) pronotal setose region anteriorly expanded inward onto pronotal disc to external third of dorsal eye; 3) dorsal surface with strong and dense micro-punctation, much stronger on elytron (Fig. 4E–G); 4) pronoto-elytral glabrous region regular oval, terminating posteriorly with an obtuse but not very wide angle, slightly wider in female (Fig. 4A); 5) elytral apex straight, epipleural angle obtuse; 6) male protarsus as in Fig. 4B–C, adhesive pallet with dense adhesive setae and small suction discs, distinctly longer than protibia; 7) aedeagus as in Fig. 4D, median lobe broad, shorter than parameres, extending 4 /5 of their length; 10) female reproductive tract as in Fig. 6B, spermatheca elongate, C-shaped; fertilization duct slender, forming several loose hairpin hoops.
This species is also a member of Group 2 in Vazirani’s (1984) key. It can be further assigned to the wui - subgroup proposed by Mazzoldi (1998) by the very large protarsus in the male. This species closely resembles Patrus wangi (Mazzoldi, 1998) described from Zhejiang and Anhui. These two species both have a well-developed protarsus which is distinctly longer than the protibia. However, it can be easily distinguished from the latter by the shape of the protarsus in the male (Fig. 4B) and of the elytral glabrous region in the female. Besides, it is larger in size, the truncature of the protibia is more oblique and the median lobe of the aedeagus lacks the hook-like process (Fig. 4D).
The new species is also similar to P. wui (Ochs, 1932). Compared to P. wui, this species is larger in size, the protarsus is also larger, longer than the protibia, the glabrous region is less broad posteriorly, and the median lobe of the aedeagus is broader.
Etymology
This species is named after the type locality ʻJiangxi Provinceʼ.
Material examined
Holotype
CHINA – Jiangxi • ♂; Jiangxi Prov. Pingxiang City, Luxi County, Wugongshan; 27°47′53″ N, 114°14′83″ E; alt. 520 m; 22–24 Sep. 2016; Ruijuan Zhang and Yudan Tang leg.; SYSU.
Paratypes
CHINA – Jiangxi • 30 ex.; same collection data as for holotype; SYSU • 2 ♀♀; Jiangxi Prov. Shangyou County, Guanggushan (光姑山) Nature Reserve; 25°54′55″ N, 114°03′09″ E; alt. 183 m; 19–21 Sep. 2016; Ruijuan Zhang and Yudan Tang leg.; SYSU • 14 ex.; 江西靖安县观音岩 [Guanyinyan, Jiangxi]; 29.04 N, 115.14 E; alt. 690 m; 20 Jul. 2014; 林仁超采 [Lin Renchao leg.]; SYSU • 1 ♀; 江西靖安县 三爪仑乡白水洞景区 [Jiangxi, Jing’an, Sanzhualun, Baishuidong Scenic Area]; 29.04 N, 115.11 E; alt. 660 m; 22 Jul. 2014; 林仁超采 [Lin Renchao leg.]; SYSU • 1 ♂; 江西井冈山白银湖 [Jiangxi, Jinggangshan, Baiyinhu]; alt. 880 m; 23 Apr. 2011; 采集人: 赵爽 [Zhao Shuang leg.]; SYSU • 1 ♂, 3 ♀♀; 江西井冈山湖羊塔 [Jiangxi, Jinggangshan, Huyangta]; 28 Apr. 2011; 采集人: 贾凤龙 [Jia Fenglong leg.]; SYSU • 1 ♂; 江西井冈山 [Jiangxi, Jinggang Shan]; 1 Apr. 2011; 李韵采 [Li Yun leg.]; SYSU • 1 ♂; W. Jiangxi, Ji’an City, Jinggang Shan, Jingzhu Shan; 26°29′45″ N, 114°04′45″ E; alt. 1130 m; 2 Aug. 2014; Chen, Hu, Lv and Yu leg.; in the stream; SHNU.
Description
MEASUREMENTS. Holotype: 8.5 mm in length, 3.9 mm in width; male: 8.4–9.8 mm in length, 3.9–4.0 mm in width; female: 7.0– 8.6 mm in length, 3.1–3.9 mm in width.
HABITUS AND COLOUR (Fig. 1D–F). Medium-sized species, oblong-oval in shape, widest just before middle, moderately convex in lateral view. Dorsal side black with strong bronze sheen. Pronotum and elytra with yellow lateral borders. Ventral side mostly reddish brown to dark brown, with legs and epipleura yellow to reddish yellow, last abdomen ferruginous.
HEAD. Labrum wide and short, ⅓ as long as wide, with anterior margin straight; anterior surface smooth; posterior surface with strong punctate-tomentose. Clypeus slightly shorter than labrum, with anterior margin straight. Fronto-clypeal suture distinct.Surface of clypeus with weak micro-reticulation anteriorly, while distinct posteriorly, among meshes of micro-reticulation with dense irregular punctation. Surface on frons and vertex with strong micro-reticulation formed by isodiametric polygonal meshes, gradually obliterated backwards. Amongst meshes of the micro-reticulation strong irregular-shaped punctation (Fig. 4E).
THORAX. Pronotum regularly attenuated from base to apex, with margins weakly convex. Surface of pronotal glabrous region with distinct micro-reticulation formed by isodiametric polygonal meshes and strong irregular punctation (Fig. 4F), much of which merges in rows to form distinct wrinkles. Lateral pubescence anteriorly expanded inward onto pronotal disc to external third of eye, posteriorly weakly reduced backwards in concave line. Scutellum wide and short, less than ½ as long as wide, with surface smooth. Pronoto-elytral glabrous region regular oval, terminating posteriorly with obtuse but not very wide angle (Fig. 4A). Lateral pubescent band in male anteriorly as wide as pronotal one, subparallel to elytral margin backwards until middle of elytron, then regularly expanded, reaching suture at about onetenth of distance from truncature; in female anteriorly as wide as pronotal one, parallel to elytral margin backwards until ⅔ of elytron, then regularly expanded, reaching suture at about 1 / 12 of distance from truncature, so that elytral glabrous region in female slightly wider. Surface of elytral glabrous region covered by weak micro-reticulation formed by transverse or oblique and slightly elongate polygonal meshes and by strong punctation formed by short transverse or oblique strioles (Fig. 4G). Truncature of elytra straight; epipleural angle obtuse, narrowly rounded, sutural angle almost 90°, narrowly rounded.
MALE GENITALIA (Fig. 4D). Median lobe shorter than parameres extending 4 /5 of their length, basal third parallel, then slightly narrowed until apical third, sub-apex parallel, apical part regularly narrowed, apex point shortly narrowed.
FEMALE REPRODUCTIVE TRACT (Fig. 6B). Gonocoxosternite elongate, apically narrowly protruding, anterior process short; laterotergite elongate, slightly narrowed towards apex; vagina elongate; spermatheca elongate, C-shaped, strongly curved; fertilization duct slender, forming several loose hairpin hoops; accessory gland short and slender, inserting dorsally on bursa.
SEXUAL DIMORPHISM. Male slightly larger in size than female; protibia in male short and wide, short triangular, strongly expanded exteriorly towards apex, apex of protibia obliquely truncate, anteroexternal angle obtuse, rounded (Fig. 4B), while shorter and less expanded, and apex straight-truncate in female. Protarsus of male large, strongly expanded, distinctly longer than protibia, slightly narrowed towards apex, ventral side with dense adhesive setae and small suction discs (Fig. 4C); elytral glabrous region slightly broader posteriorly in female.
Distribution
Known from Pingxiang, Shangyou, Jingxi and Jinggangshan in Jiangxi Province, China.
description: Published as part of Liang, Zulong, Angus, Robert B. & Jia, Fenglong, 2021, Three new species of Patrus Aubé with additional records of Gyrinidae from China (Coleoptera, Gyrinidae), pp. 1-39 in European Journal of Taxonomy 767 on pages 8-10, DOI: 10.5852/ejt.2021.767.1481, http://zenodo.org/record/5715526