Grouvellinus buyi Jiang, Wu & Chen, 2024, sp. nov.
Creators: name: Jiang, Ri-Xin
name: Wu, Ping-Lan
name: Chen, Xiang-Sheng
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Elmidae
Grouvellinus
Grouvellinus buyi

description: Grouvellinus buyi sp. nov.
Figs 1 B, 4, 5, 12 B, G
Material examined.
(11 exs: 5 ♂♂, 6 ♀♀): Holotype: China • ♂, labeled ‘ China: Guizhou, Guiyang City (贵阳市), Wudang District (乌当区), Xinbaobuyi Township (新堡布依族乡), Xiangzhigou Scenic Area (香纸沟景区), 26°47'02"N, 106°56'09"E, H: 1187 m, 06. XI. 2022, Jiang Ri-Xin leg. ’ (GUGC). Paratypes: China • 4 ♂♂, 6 ♀♀, with same label data as the holotype (GUGC).
Diagnosis.
Body, long-oval, dark brown, surface shiny with cupreous metallic luster. Pronotum widest at basal 2 / 5, finely covered with small punctures, anterior and posterior angles densely covered with large punctures. Elytral intervals VII and VIII carinated, carinae granulated. Strial punctures of elytra very large in basal 2 / 3 and much smaller in apical 1 / 3. Sides of aedeagus generally subparallel in dorsal and ventral view, with median lobe slightly longer than parameres, distinctly curved in lateral view, apex narrowed and subacute. Parameres with apex rounded, lateral portion with long setae at apical 2 / 5.
Description.
Male. Body long-oval (Fig. 1 B), dark brown with tibiae and antenna pale brown, surface shiny with distinct cupreous metallic luster. Plastron area confined to head except for frons, vertex and clypeus, lateral portions of prosternum, ninth elytral interval and epipleura, lateral portions of mesosternum, metaventrite, abdomen, and femora.
Head (Fig. 4 A) wider than long, dorsal surface shiny, densely with short setae (except discal part) and with sparse large punctures, each bearing a longer seta. Surface of clypeus shiny, with sparse small punctures and long setae. Labrum transverse, narrower than clypeus, surface shiny, with sparse short setae, lateral margins with long bristles, apical margin rounded.
Pronotum (Fig. 4 B), wider than long, widest near middle. Disc finely punctured with sparse small punctures, punctures with longer adpressed setae, intervals glabrous, shiny. Surface of anterior and posterior angles densely with large punctures. Anterior margin arcuate, anterior angles distinctly produced and acutangular, pronotal margins finely curved. Basal margin trisinuate, posterior angles acutangular. Longitudinal impression absent, with several pairs of small granules located in front of angles of scutellum. Sublateral carinae present in basal 1 / 2 of pronotum, trisinuate, each side of sublateral carinae with a shallow and indistinct oblique impression, extending from apical end of carina to near anterior angle. Prosternal process (Fig. 4 D) with straight apex, surface sparsely with large punctures.
Scutellum (Fig. 4 B) half fusiform, ~ 1.5 × as long as wide, widest near middle; surface microreticulated, with several small punctures; lateral margins finely curved, apex acutangular.
Elytra (Fig. 4 C) ~ 1.5 × as long as wide, widest behind basal 1 / 2. Surface shiny, with distinct cupreous metallic luster and rows of sparse long setae. Strial punctures larger in basal 1 / 2, separated by ~ 1.5 × their diameters, much smaller and widely separated in other parts of elytra. Granulated carinae on strial intervals VII and VIII, other intervals flat. Hind wings well developed.
Metaventrite (Fig. 4 D), surface rough with sparse long setae and large round punctures at disc. Median sulcus distinct, extending from posterior margin to anterior 1 / 2. A pair of small round impression located at basal sides of median sulcus. Lateral sides of disc with series of elliptical shallow impression.
Abdomen. Middle regions of ventrites I – IV and anterior part of ventrite V punctured (Fig. 4 D), covered with sparse small punctures, each puncture bearing a long seta. Other parts of abdomen (Fig. 4 D) covered with plastron and mixed with sparse long setae. Apex of ventrite V weakly concaved. Ventrite I with well-developed pair of admedian carinae, straight, extending from base to apex.
Legs simple, surface granulated; femora widened, surface with plastron; inner side of tibiae with cleaning fringes; tarsi slightly shorter tibiae; tarsal claws simple.
Genitalia. Aedeagus (Fig. 5 A – D), long and slender, symmetrical; median lobe slightly longer than parameres, finely get narrowed in basal 3 / 4, distal 1 / 4 distinctly sharpened. Parameres (Fig. 5 D) curved at apex, with apex rounded; apical 1 / 2 covered with long setae.
Female. Externally similar to the male, averagely larger. Ovipositor as in Fig. 12 B, G. Stylus short and narrow, weakly curved at apex, ~ 1 / 7 as long as distal portion of coxite. Coxite long, apex weakly expanded, roundly broadened at outer margin, with several short and curved sensilla. Distal portion of coxite nearly straight, surface finely with very short and acute setae. Proximal portion of coxite short, longer than 1 / 3 length of distal portion, surface finely covered with sparse, very short and acute setae. Valvifers ~ as long as coxite, longitudinal baculum weakly curved.
Measurements.
Male (n = 5): CL: 1.91–2.09 mm (1.96 ± 0.07); PL: 0.58–0.59 mm (0.58 ± 0.01), PW: 0.71–0.74 mm (0.72 ± 0.01); EL: 1.32–1.50 mm (1.38 ± 0.07), EW: 0.94–1.00 mm (0.97 ± 0.02).
Female: CL (n = 6): 2.18–2.23 mm (2.21 ± 0.02); PL: 0.62–0.65 mm (0.63 ± 0.01), PW: 0.72–0.83 mm (0.77 ± 0.04); EL: 1.56–1.58 mm (1.57 ± 0.01), EW: 0.97–1.10 mm (1.01 ± 0.05).
Distribution.
China: Guizhou.
Biology.
All adults were collected from submerged stone in small ravine stream (Fig. 14 D).
Etymology.
The specific epithet ‘ buyi ’ is a nation of Chinese, which is the majority nation of the type locality of this new species: Xinbaobuyi Township (Guiyang City, Guizhou Province, China).
Comparative diagnosis.
The new species is similar with Grouvellinus sinensis Grouvelle, 1906 and G. ligulaceus Bian & Zhang, 2023 in habitus. Grouvellinus buyi sp. nov. can be easily distinguished from G. ligulaceus by the following characters: 1) strial punctures of elytra very large in basal 1 / 2 (vs much smaller); 2) prosternal process with straight apex (vs weakly rounded); 3) median lobe of aedeagus slender (vs much broader); 4) parameres of aedeagus distinctly curved at apex (vs not as above).
The new species can be distinguished from G. sinensis by having a body with metallic luster and the surface of metaventrite and abdominal ventrites shiny, whereas the body lacks metallic luster and the surface of metaventrite and abdominal ventrites is distinctly rough in G. sinensis.
description: Published as part of Jiang, Ri-Xin, Wu, Ping-Lan & Chen, Xiang-Sheng, 2024, Five new species of the genus Grouvellinus Champion, 1923 from Guizhou Province, China (Coleoptera, Elmidae), pp. 73-97 in ZooKeys 1219 on pages 73-97, DOI: 10.3897/zookeys.1219.125754