Grouvellinus muyinlini, Jiang & Wu & Chen, 2024

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), ZooKeys 1219, pp. 73-97 : 73-97

Grouvellinus muyinlini sp. nov.

Figs 1 E , 10 , 11 , 12 E, J

Material examined.

(40 exs: 20 ♂♂, 20 ♀♀): Holotype: China • ♂, labeled ‘ China: Guizhou, Guiyang City (贵阳市), Huaxi District (花溪区), Qiantao Buyi and Miao Township (黔陶布依族苗族自治乡), Machang Village (马场村), Raolongxiagu (绕拢峡谷), H: 1084 m, 26°19'12"N, 106°46'19"E, 13. VII. 2022, Jiang Ri-Xin, Yin-Lin Mu, Tian-Jun Liu & Feng-E Li leg. ’ ( GUGC) . Paratypes: China • 19 ♂♂, 20 ♀♀, with same label data as the holotype ( GUGC) .

Diagnosis.

Body elongate-oval, dark brown with antenna, elytra and tibia pale brown, surface shiny with weak cupreous metallic luster. Elytral interval VIII carinated. Pronotum widest near middle, disc with dense small punctures, portions of posterior angles granulated, base of pronotum with a pair of median foveae. Median sulcus of metaventrite thin but distinct, extending from base to 3 / 4 length of metaventrite. Aedeagus with median lobe distinctly longer than parameres, constricted at base, finely narrowed from basal 1 / 5 to apex, apex rounded. Parameres thinner and shorter than median lobe, weakly sinuated and curved at apex, lateral portion with long setae at apical 1 / 6.

Description.

Male. Body elongate-oval (Fig. 1 E ), head and elytra dark brown with elytra, tibiae, antennae, and elytra pale brown, dorsal surface shiny with 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. 10 A ) wider than long, dorsal surface shiny, densely covered in short setae (except discal part) and sparse longer setae. Clypeus shiny, with dense short setae (except disc) and sparse long setae. Labrum transverse, slightly narrower than clypeus, shiny, basal 1 / 2 hairless and microreticulated, apical 1 / 2 with sparse short setae, lateral margins with long bristles, apical margin rounded.

Pronotum (Fig. 10 B ), slightly wider than long, widest near middle. Disc with dense punctures in different length and long setae, intervals of punctures glabrous, longitudinal impression absent, with a pair of small round foveae located at middle base near posterior margin, surface of posterior angles granulated. Anterior margin arcuate, anterior angles produced and weakly acutangular. Lateral margins finely curved. Basal margin trisinuate, emarginated before scutellum, posterior angles acutangular. Sublateral carinae distinct, extending from base to ~ 2 / 5 length of pronotum, each side of sublateral carinae with a shallow and indistinct oblique impression, extending from apex of sublateral carinae to near anterior angle. Prosternal process (Fig. 10 D ) with apex rounded, surface wrinkled and sparsely covered with large punctures and long setae.

Scutellum (Fig. 10 B ) widely triangular, approximately as long as wide, widest near middle; surface densely punctured, each puncture bearing a long seta. Lateral margins finely curved, apex obtuse.

Elytra (Fig. 10 C ) widest near apical 3 / 7, reddish brown, lateral margins sub-parallel in basal 4 / 7. Surface shiny, with weakly cupreous metallic luster and sparse long setae. Granulate carinae on interval VIII, interval VII with a row of sparse and very small granules, extending from base to apex; other intervals flat. Strial punctures larger in basal 4 / 7, separated by more than 2 × diameter, and much smaller and widely separated in other part of elytra. Hind wings well developed.

Metaventrite (Fig. 10 D ), surface finely punctured with large punctures and long setae at disc, lateral sides of disc with series of elliptical shallow impression. Median sulcus distinct, extending from posterior margin to 3 / 4 length of metaventrite, with a pair of round impression at sides of basal median sulcus.

Abdomen. Base of ventrite I (Fig. 10 D ) weakly wrinkled, middle regions of ventrites I – IV and anterior part of ventrite V (Fig. 10 D ) punctured with large and round punctures, each puncture bearing a long seta. Other parts of abdomen (Fig. 10 D ) with plastron and mixed with sparse long setae. Apex of ventrite V weakly curved. Ventrite I with a pair of well-developed admedian carinae, curved at middle, extending from base to apex.

Legs simple, surface granulated; femora widened, surface covered with sericeous tomentum; inner side of tibiae with cleaning fringes; tarsi slightly shorter than tibiae; tarsal claws simple.

Genitalia. Aedeagus (Fig. 11 A – D ), long and wide, symmetrical; median lobe distinctly longer than parameres, constricted at base, finely narrowed from basal 1 / 5 to apex, with apex rounded. Parameres (Fig. 11 D ) thinner and shorter than median lobe, weakly sinuated and curved at apex, lateral portion with long setae at apical 1 / 6.

Female. Externally similar to the male, averagely larger. Ovipositor as in Fig. 12 E, J . Stylus short and narrow, nearly straight, weakly expanded at middle, shorter than 1 / 4 length of distal portion of coxite. Coxite long, apex distinctly expanded, roundly broadened at outer margin, with several short and curved sensilla. Distal portion of coxite nearly straight, surface finely covered with very short and acute setae. Proximal portion of coxite short, ~ 1 / 2 the length of distal portion, surface finely covered with very short and acute setae which are sparser than setae on distal portion of coxite. Valvifers slightly longer than coxite, longitudinal baculum nearly straight, weakly curved at base.

Measurements.

Male (n = 10): CL: 1.78–2.09 mm (1.89 ± 0.09); PL: 0.49–0.58 mm (0.53 ± 0.03), PW: 0.62–0.68 mm (0.65 ± 0.02); EL: 1.26–1.52 mm (1.35 ± 0.07), EW: 0.81–0.90 mm (0.86 ± 0.03).

Female (n = 10): CL: 1.90–2.11 mm (2.00 ± 0.07); PL: 0.55–0.59 mm (0.57 ± 0.01), PW: 0.68–0.72 mm (0.70 ± 0.01); EL: 1.36–1.52 mm (1.42 ± 0.07), EW: 0.85–1.02 mm (0.92 ± 0.05).

Distribution.

China: Guizhou.

Biology.

All adults were collected from submerged stone in small ravine stream (Fig. 15 C – E ).

Etymology.

The species epithet honors our friend and colleague Dr. Yin-Lin Mu (Guizhou University), one of the collectors of the new species; the name is treated as an adjective.

Comparative diagnosis.

Grouvellinus muyinlini sp. nov. is most similar to G. lihaitaoi sp. nov. For differences see the comparative diagnosis of G. lihaitaoi sp. nov.

Figures

Figure 1. Dorsal habitus of Grouvellinus species, holotypes A G. loong sp. nov. B G. buyi sp. nov. C G. wangmoensis sp. nov. D G. lihaitaoi sp. nov. E G. muyinlini sp. nov. Scale bar: 0.5 mm.

Figure 10. Diagnostic features of Grouvellinus muyinlini sp. nov., paratype A head, dorsal view B pronotum, dorsal view C elytra, dorsal view D ventral habitus. Scale bars: 0.25 mm (A, B); 0.5 mm (C, D).

Figure 11. Aedeagus of Grouvellinus muyinlini sp. nov., paratype A ventral view B lateral view C dorsal view D apex of median lobe and parameres. Scale bars: 0.05 mm (D); 0.1 mm (A – C).

Figure 12. Ovipositor of Grouvellinus species A, F G. loong sp. nov., paratype B, G G. buyi sp. nov., paratype C, H G. wangmoensis sp. nov., paratype D, I G. lihaitaoi sp. nov., paratype E, J G. muyinlini sp. nov., paratype. Scale bars: 0.1 mm.

Figure 15. Habitat of Grouvellinus species A general environment of the type locality of G. lihaitaoi sp. nov. B living adult of G. lihaitaoi sp. nov. C general environment of G. muyinlini sp. nov. D dr. Yin-Lin Mu working in the type locality of G. muyinlini sp. nov. E the first author working in the same locality as ditto F general environment of G. wangmoensis sp. nov.