Patrus hainanensis 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 hainanensis

description: Patrus hainanensis sp. nov.
urn:lsid:zoobank.org:act: 1001055C-63EB-4EC7-A1E4-92FED32C3A58
Figs 1A–C, 3, 6A
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 middle of dorsal eye; 3) punctation absent on head and pronotum; 4) punctures on surface of elytral glabrous region elongate transverse or oblique, several narrow longitudinal stripes shown on elytral glabrous region, micro-reticulation on elytral glabrous region weak and subtle, very elongate (Fig. 3A, G); 5) in lateral view elytral pubescent area in basal ½ distinctly narrower than on pronotum, expanded to similar width apically (Fig. 1C); 6) elytral apex rounded, epipleural angle acute; 7) female elytra similar to those of male; 8) male protarsus as in Fig. 3B–C, adhesive pallet with few adhesive setae and large suction discs, ⅔ length of protibia; 9) aedeagus as in Fig. 3D, median lobe shorter than parameres, extending to ¾ of their length, strongly laterally expanded in apical ⅓; 10) female reproductive tract as in Fig. 6A, spermatheca elongate, reniform; fertilization duct broad and flattened, forming several compact hairpin hoops.
This species is a member of Group 2 in Vazirani’s (1984) key (Group V in the key of Ochs 1928). The few adhesive setae and large suction discs on the male protarsus and characteristic elytral surface sculpture can easily distinguish this species from other known Chinese species of this group. This species is similar to P. coomani (Peschet, 1925), but can still be easily seperated by its narrow setose region at the elytral base and by the median lobe strongly laterally expanded in apical ⅓.
Etymology
This species is named after the type locality ʻHainan Provinceʼ.
Material examined
Holotype
CHINA – Hainan • ♂; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 8 Jul. 1981; 华立 中采 [Hua Lizhong leg.]; SYSU.
Paratypes
CHINA – Hainan • 5 ♂♂, 2 ♀♀; same collection data as for holotype; SYSU • 1 ♂, 2 ♀♀; 海南尖峰 岭五分区 [Hainan, Jianfengling Mt., fifth division,]; 5 Jul. 1981; 张新府采 [Zhang Xinfu leg.]; SYSU • 1 ♂; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 7 Jul. 1981; 黄云采 [Huang Yun leg.]; SYSU • 1 ♂, 3 ♀♀; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 7 Jul. 1981; 陈宁美采 [Chen Ningmei leg.]; SYSU • 1 ♂, 1 ♀; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 7 Jul. 1981; 刘元福采 [Liu Yuanfu leg.]; SYSU • 9 ♂♂, 8 ♀♀; 海南尖峰岭三分区 [Hainan, Jianfengling Mt., third division]; 7 Jul. 1981; 李宗冉采 [Li Zongran leg.]; SYSU • 10 ♂♂, 6 ♀♀; 海 南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 7 Jul. 1981; 梁少营采 [Liang Shaoying leg.]; SYSU • 1 ♂, 5 ♀♀; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 8 Jul. 1981; 何国锋采 [He Guofeng leg.]; SYSU • 4 ♂♂, 6 ♀♀; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 8 Jul. 1981; 雷群邦采 [Lei Qunbang leg.]; SYSU • 1 ♂; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 8 Jul. 1981; 李逸昭采 [Li Yizhao leg.]; SYSU • 1 ♀, 海南尖峰岭 五分区 [Hainan, Jianfengling Mt., fifth division]; 8 Jul. 1981; 陈润吉采 [Chen Runji leg.]; SYSU • 2 ♂♂, 2 ♀♀; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 29 Jul. 1983; 陈焕强 采 [Chen Huanqiang leg.]; SYSU • 1 ♂, 3 ♀♀; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 29 Jul. 1983; 江世贵采 [Jiang Shigui leg,]; SYSU • 1 ♂, 3 ♀♀; 海南尖峰岭五分区 [Hainan, Jianfengling Mt., fifth division]; 8 Sep. 1983; 保护站采 [Reserve station leg.]; SYSU • 1 ♀; 海南尖峰 岭天池 [Hainan, Jianfengling Mt., Tianchi]; 8 Sep. 1983; 保护站采 [Reserve station leg]; SYSU.
Description
MEASUREMENTS. Holotype: 7.0 mm in length, 3.0 mm in width; male: 6.9–9.0 mm in length, 3.0– 3.8 mm in width; female: 7.0– 8.5 mm in length, 3.2–3.4 mm in width.
HABITUS AND COLOUR (Fig. 1A–C). Medium-sized species, oblong-oval in shape, widest just before middle, moderately convex in lateral view. Dorsal side black with strong bronze sheen, stronger on elytron than on head and pronotum. Pronotum and elytra with yellow lateral borders. Ventral side mostly black, with legs and rear of abdomen ferruginous, epipleuron yellow.
HEAD. Labrum wide and short, ⅓ as long as wide, with anterior margin straight; anterior surface smooth; posterior surface with strong punctate-tomentose. Micro-reticulation on surface of clypeus distinct with polygonal meshes. Micro-reticulation on frons and vertex rather distinct, with meshes transverse or oblique (Fig. 3E), gradually obliterated backwards. Punctation absent on head.
THORAX. Pronotum regularly attenuated from base to apex, with margins weakly convex. Surface of pronotal glabrous region with weak and subtle micro-reticulation formed by elongate transverse or oblique meshes (Fig. 3F); punctation absent on pronotum. Lateral pubescence anteriorly expanded inward onto pronotal disc to middle of dorsal eye, posteriorly narrower and parallel to lateral borders. Scutellum wide and short, ½ as long as wide, with surface smooth. Lateral pubescence on elytra anteriorly strongly reduced, distinctly narrower than on basal pronotum until middle of elytra, then abruptly expanded and reaching suture just before truncature (Fig. 3A). Pronoto-elytral glabrous region irregular oval, terminating posteriorly with obtuse and wide angle. Surface of elytral glabrous region covered by distinct and rather dense punctation formed by elongate transverse or oblique strioles and with several narrow longitudinal stripes, micro-reticulation invisible under optical microscope, but visible under SEM, similar to that on pronotum (Fig. 3G). Strioles at outer side of elytra much longer than that at inner side. Truncature of elytra straight; epipleural angle almost 90°, acute; sutural angle almost 90°, narrowly rounded.
MALE GENITALIA (Fig. 3D). Median lobe shorter than parameres, extending ¾ of their length, basal half parallel, strongly laterally expanded in apical ⅓, apical part regularly narrowed toward apex, apex point shortly narrowed.
FEMALE REPRODUCTIVE TRACT (Fig. 6A). Gonocoxosternite elongate, apically narrowly rounded, anterior process elongate; laterotergite elongate, slightly curved apically; vagina elongate; spermatheca elongate, reniform; fertilization duct broad and flattened, forming several compact hairpin hoops; accessory gland short and slender, inserting dorsally on bursa.
SEXUAL DIMORPHISM. This species exhibits very little sexual dimorphism. Protibia of both sexes rather short and wide, basal third regularly expanded from base to apex, apical two-thirds subparallel, anteroexternal angle rather obliterated. Protarsus in male expanded, sub-oval, slightly more than ½ as long as protibia, slightly wider (Fig. 3B), inner margin straight, external margin convex, ventral side with large sucking disc on top of adhesive setae (Fig. 3C), while not expanded and without adhesive setae in female.
Distribution
Only known from type locality Jianfengling Mt, Hainan 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 3-8, DOI: 10.5852/ejt.2021.767.1481, http://zenodo.org/record/5715526