Patrus shangchuanensis 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 shangchuanensis

description: Patrus shangchuanensis sp. nov.
urn:lsid:zoobank.org:act: 6EE82957-25AB-4EE0-90AC-3F5250BCD0B9
Figs 2, 5, 6C
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. 5F–H); 4) pronoto-elytral glabrous region regularly oval in male, terminating posteriorly with obtuse but not very wide angle, with two postero-lateral expansions in females (Fig. 5A– B); 5) elytral apex straight, epipleural angle obtuse; 6) male protarsus as in Fig. 5C–D, adhesive pallet with dense adhesive setae and small suction discs, almost as long as protibia; 7) aedeagus as in Fig. 5E, median lobe shorter than parameres, extending 4 /5 length, apical part notably narrowed, sub-apically slightly constricted; 10) female reproductive tract as in Fig. 6C, spermatheca elongate, C-shaped; fertilization duct rather slender and flattened, forming several loose hairpin hoops.
This species is also a member of the wui -subgroup. It closely resembles Patrus wangi (Mazzoldi, 1998) and P. wui (Ochs, 1932). All these three species show a distinct sexual dimorphism in the shape of the elytral glabrous region. Two postero-lateral expansions are shown in female of both, the new species and P. wangi but much weaker in this species than in P. wangi so that the lateral pubescence on the elytra is visible from above throughout (Figs 2D, 5B). Besides, the protarsus in the male is less developed, at most as long as protibia in this species (Fig. 5C–D). The elytral glabrous region in the female is much broader posteriorly than in male P. wui, whereas postero-lateral expansions are not present in this species. The male genitalia of these three species are also distinctly different from each other.
Etymology
This species is named after the type locality ʻShangchuan Islandʼ.
Material examined
Holotype
CHINA – Guangdong • ♂; 广东省台山市上川岛猕猴省级自然保护区 [Guangdong, Taishan City, Shangchuan Island Macaque Provincial Nature Reserve]; 21°44′51″ N, 119°49′36″ E; alt. 50 m; 17 Jan. 2019; 贾凤龙, 梁祖龙采 [Jia Fenglong and Liang Zulong leg.]; SYSU.
Paratypes
CHINA – Guangdong • 13 ♂♂, 12 ♀♀; same collection data as for holotype; SYSU • 5 ♂♂, 3 ♀♀; 广东省台山市上川岛猕猴省级自然保护区 [Guangdong, Taishan City, Shangchuan Island Macaque Provincial Nature Reserve]; 21°44′36″ N, 112°50′33″ E; alt. 10 m; 18 Jan. 2019; 贾凤龙, 梁祖龙采 [Jia Fenglong and Liang Zulong leg.]; SYSU • 1 ♂; 广东省台山市上川岛猕猴省级自然保护区石 背潭 [Guangdong, Taishan City, Shangchuan Island Macaque Provincial Nature Reserve, Shibeitang]; 21°46′1″ N, 112°49′2″ E; alt. 20 m; 19 Jan. 2019; 贾凤龙, 梁祖龙采 [Jia Fenglong and Liang Zulong leg.]; SYSU.
Description
MEASUREMENTS. Holotype: 7.7 mm in length, 3.6 mm in width; male: 7.1–8.6 mm in length, 3.2–3.6 mm in width; female: 6.9–7.6 mm in length, 2.9–3.4mm in width.
HABITUS AND COLOUR (Fig. 2A–E). Medium-sized species, 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 black, with legs and epipleura yellow to reddish yellow. HEAD. Labrum wide and short, slightly less than ⅓ as long as wide, with anterior margin straight; anterior surface smooth; posterior surface strongly punctate-tomentose. Clypeus slightly shorter than labrum, with anterior margin slightly concave. Fronto-clypeal suture distinct. Surface of clypeus with strong micro-reticulation formed by isodiametric polygonal meshes, among meshes with strong and dense punctation. Surface of frons and vertex with strong micro-reticulation formed by isodiametric polygonal meshes, gradually obliterated backwards. Amongst meshes of micro-reticulation strong irregular-shaped punctation (Fig. 5F).
THORAX. Pronotum regularly attenuated from base to apex, with margins weakly convex. Surface of pronotal glabrous region with strong irregular-shaped punctation, some of which merges in rows to form distinct wrinkles (Fig. 5G), micro-reticulation on median disc strong, formed by isodiametric polygonal meshes, obliterated towards margins. Lateral pubescence anteriorly expanded inward onto pronotal disc to external third of dorsal 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 in male regularly oval. Lateral pubescent area in male anteriorly as wide as on pronotum, parallel to elytral margin backwards until the middle of elytron, then regularly expanded, reaching suture at about ⅛ to truncature (Fig. 5A). Pronoto-elytral glabrous region in female in characteristic shape, with weak postero-lateral expansion at each side (Fig. 5B). Lateral pubescence in female anteriorly two-fifths slightly narrowed backwards, then regularly narrowed in concave line, apical fifth suddenly expanded, reaching suture at same position as in male. Surface of elytral glabrous region covered by distinct micro-reticulation formed by transverse or oblique and slightly elongate polygonal meshes and by strong punctation formed by short transverse or oblique strioles (Fig. 5H). Truncature of elytra straight; epipleural angle obtuse, narrowly rounded, sutural angle almost right angle, narrowly rounded.
FRONT LEGS. Protibia in male short and wide, short triangular, strongly expanded exteriorly towards apex, apex of protibia obliquely truncate, antero-external angle obtuse, narrowly rounded (Fig. 5C). Protibia in female slenderer than in male. Protarsus of male large, strongly expanded, almost as long as protibia, basal four-fifths subparallel, apical fifth regularly narrowed (Fig. 5D).
MALE GENITALIA (Fig. 5E). Median lobe notably shorter than parameres, basal third parallel, then slightly narrowed backwards until apical third, slightly expanded subapically, apical part regularly narrowed, apex form obtuse angle.
FEMALE REPRODUCTIVE TRACT (Fig. 6C). Gonocoxosternite elongate, apically narrowed, anterior process short and broad; laterotergite elongate, slightly narrowed towards apex; vagina elongate; bursa rather broad; spermatheca elongate, C-shaped, strongly curved; fertilization duct rather slender and flattened, forming several loose hairpin hoops; accessory gland short and slender, inserting dorsally on bursa.
SEXUAL DIMORPHISM. Protibia in male short and wide, short triangular, strongly expanded exteriorly towards apex, apex of protibia obliquely truncate, antero-external angle obtuse, narrowly rounded (Fig. 5C), while slender and less expanded, and apex straight-truncate in female. Protarsus of male large, strongly expanded, almost as long as protibia, basal four-fifths subparallel, apical fifth regularly narrowed, ventral side with dense adhesive setae and small suction disks (Fig. 5D); elytral glabrous region regularly oval in male and with two weak postero-lateral expansion in female.
Distribution
Only known from the type locality Shangchuan Island, Guangdong 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 10-13, DOI: 10.5852/ejt.2021.767.1481, http://zenodo.org/record/5715526