Grouvellinus spnaericus, Bian & Zhang, 2023

Bian, Dongju & Zhang, Yi, 2023, Descriptions of eight new species of Grouvellinus from China (Coleoptera, Elmidae), Zootaxa 5254 (2), pp. 257-277 : 258

Grouvellinus spnaericus sp. nov.

( Figs 1A–B , 5A–C , 13A–C )

Type materiral examined: holotype, male ( IAECAS): “ CHINA: Yunnan / Yingjiang County / Tongbiguan Vill.ļ 97°35.18’ E 24°38.5’ N / 925 m, 21.VI.2019 / Leg. Peng et al. (2)” . Paratypes, 3 males, 1 female ( IAECAS), the same data as holotype .

Diagnosis. Body broadly obovate, dark brown to black; disc of pronotum without median carina or sulcus; sublateral carinae present in basal 0.4; pronotum hemispherically vaulted; elytra short, sub-cordiform. This species can be easily distinguished from other known species in the genus Grouvellinus by its pronotum hemispherically vaulted; elytra short, sub-cordiform, and also by its penis broad in basal 0.8, and distal 0.2 suddenly narrowed, apex narrowly rounded.

Description. Habitus see Figs 1A–B . Body broadly obovate. BL 2.5 mm, BW 1.4 mm. Dark brown to black, legs dark brown except tarsi light brown.

Head. Labrum black, but yellowish brown at the anterior margin, with dense long yellowish setae anteriorlaterally; surface smooth and shining, fine setiferous punctures sparsely distributed. Clypeus and frons black, smooth and shining, medium-sized setiferous punctures densely distributed.

Pronotum ( Fig. 5A ) hemispherically vaulted, PL 0.8 mm, PW 1.1 mm, broadest at basal 0.3, lateral sides slightly attenuated posteriorly and distinctly attenuated anteriorly. Lateral margin denticulated in anterior half. Anterior angles sharp, slightly produced; posterior angles nearly right-angled. Surface coarse, densely punctate and pubescent, setae yellow and short. Sublateral carina present in basal 0.4, median carina absent.

EL 1.7 mm, EW 1.4 mm, subparallel in anterior half, then distinctly attenuated posteriorly. Strial punctures small and deep, separated by 0.5 to 1 time of their diameters in basal half, then well separated in distal half, separated by 2–3 times of their diameters. Intervals coarse and convex, sparsely punctate and pubescent. Intervals 3, 5, 7, 8 carinate. Carinae on intervals 3 present from base to basal half. Carinae on intervals 5, 7, 8 extend from base to subapical part.

Prosternum densely pubescent, prosternal process ( Fig. 5B ) slightly narrowed in basal 0.6, subparallel in distal 0.4, apex broadly rounded. Surface smooth and shining, sparsely punctate and pubescent. Disc slightly elevated, lateral margin distinctly rimmed. Metaventrite ( Fig. 5C ) broadly impressed, disc coarse with large punctures densely impressed, an oblique row of large punctures behind of metacoxa and a groove in front of metacoxa. Lateral area densely pubescent with small punctures sparsely distributed.

Ventrites I–II with disc wrinkled and densely punctate. Ventrites III–IV and anterior third of ventrite V with disc smooth and shining, sparsely punctate, only with a few pubescence. A pair of ad-median carinae present on ventrite I. Ventrite V densely granulate and pubescent in distal 2/3; lateral area with dense pubescence ( Fig. 5C ).

Aedeagus ( Figs 13A–C ). 1.0 mm long. Penis is about 2.7 times as long as phallobase. Penis broad, about three times as wide as the paramere, slightly broad from base to basal 0.8, then distinctly sharpened, apex narrowly rounded. Apophyses developed, reaching the subapical part of the phallobase. Parameres (in dorsal view) slim, about 1/3 as wide as penis, apices of the parameres narrowly rounded, not overreaching the penis.

Males: BL 2.4–2.55 mm, BW 1.4–1.5 mm (n=4); females: BL 2.5 mm, BW 1.4 mm (n=1).

Distribution. China: Yunnan.

Etymology. The epithet is derived from the Latin adjective “spnaericus” = “globose”, and refers to the shape of the pronotum.

Figures

FIGURE 1. Habitus A–B) Grouvellinus spnaericus sp. nov. C–D) G. elongatus sp. nov. A, C) dorsal view B, D) ventral view.

FIGURE 5. Grouvellinus spnaericus sp. nov. A) anterior part of body, dorsal view; B) same, ventral view; C) posterior part of body, ventral view.

FIGURE 13 Aedeagus A–C) Grouvellinus spnaericus sp. nov. D–F) G. elongatus sp. nov. A, D) ventral view B, E) dorsal view C, F) lateral view.