Grouvellinsus spiculatus, 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 : 265-266

Grouvellinsus spiculatus sp. nov.

( Figs 3C–D , 10A–C , 15D–F )

Type material examined: holotype, male ( IAECAS): “ China: Yunnan / Nujiang Pref. / Lushui City, Panma Townļ 26°0.05′N 98°39.7′E, 2392 m, 6. VII. 2019 / Leg. Peng et al. (26). Paratypes: 13 males, 1 female ( IAECAS), the same data as holotype; 1 male ( IAECAS): “ China: Yunnan / Yingjiang County / Tongbiguan Vill. ļ 26°36.58′N 97°36.33′E / 1001 m, 24. VI. 2019 / Leg. Peng et al. (1)” .

Diagnosis. Body black, elongated obovate, middle-sized; pronotum broadest at basal 0.4, then distinctly attenuated anteriorly and slightly attenuated posteriorly; strial punctures large and deep on elytra; elytral intervals 7, 8 distinctly carinate; prosternal process is linguiform. This species is similar to Grouvellinus tibetanus Jäch, 1984 in habitus, but it can be distinguished from the latter by its aedeagus distinctly smaller than G. tibetanus , and also by subapical part of penis suddenly narrowed, not gradually narrowed as in G. tibetanus .

Description. BL 2.5 mm, BW 1.2 mm. Body elongated obovate. Habitus see Figs 3C–D . Body black, legs dark brown except femora black. Antennae yellowish brown.

Head. Labrum smooth and shining, setiferous punctures moderately dense on disc, yellowish pubescence very dense laterally. Clypeus and frons smooth and shining, punctures and pubescence moderately dense.

Pronotum ( Fig. 10A ) broadest at basal 0.4, distinctly attenuated anteriorly and slightly attenuated posteriorly, PL 0.7 mm, PW 0.9 mm. Disc densely punctate and pubescent. Pubescence short, sub-erected. Sublateral carinae present in basal 0.3, a deep oblique groove extending from apex of carina towards anterior angle on each side. Median carina presents in basal 0.1. The area near anterior and posterior angles somewhat rugulose. A pair of small impressions are in front of anterior angles of scutellum.

EL 1.8 mm, EW 1.2 mm. Elytra conjointly rounded. Strial punctures large and deep, separated by 0.5–1 time of the diameter in basal half. Punctures smaller and shallower, well separated in distal half (4–5 times of their diameters). Intervals flat, but intervals 2–4 elevated in basal 0.2, intervals 7, 8 carinate. Intervals 1, 3, 5 with a row of small setiferous punctures separately.

Prosternal process ( Fig. 10B ) is linguiform, gradually narrowed in basal half, subparallel in distal half, apex broadly rounded; disc smooth and shining, slightly elevated in basal 0.6, with few small setiferous punctures; distal 0.4 somewhat rugulose; lateral margin distinctly rimmed. Metaventrite ( Fig. 10C ) narrowly impressed, disc coarse, almost without pubescence; lateral area densely pubescent; with a row of very large punctures behind of mesocoxa and a groove in front of metacoxa on each side.

Ventrite I rugulose in basal half, smooth and shining in distal half, disc only with few punctures; a pair of admedian carinae present; lateral area densely pubescent. Ventrites II–IV with disc smooth and shining, setiferous punctures sparsely distributed, lateral area densely pubescent. Ventrite V densely granulate and pubescent except basal 0.3 on disc ( Fig. 10C ).

Aedeagus ( Figs 15D–F ) 0.65 mm long. Penis is about 2.1 times as long as phallobase. Penis broad in basal 0.8, distal 0.2 suddenly sharpened, apex narrowly rounded. Parameres are slightly shorter than penis, broad in basal 0.2, then gradually narrowed to basal 0.8, distal 0.2 slightly narrowed, apices narrowly rounded.

Males: BL 2.3–2.6 mm, BW 1.1–1.2 mm (n=8); females: BL 2.6 mm, BW 1.2 mm (n=1).

Distribution. China: Yunnan.

Etymology. The epithet is derived from the Latin adjective “spiculatus” which means cuspidal, refers to that the distal 0.2 of penis being cuspidal.

Figures

FIGURE 3. Habitus A–B) Grouvellinus pengi sp. nov. C–D) G. spiculatus sp. nov. A, C) dorsal view B, D) ventral view.

FIGURE 10. Grouvellinus spiculatus sp. nov. A) anterior part of body, dorsal view; B) same, ventral view; C) posterior part of body, ventral view.

FIGURE 15 Aedeagus A–C) Grouvellinus pengi sp. nov. D–F) G. spiculatus sp. nov. A, D) ventral view B, E) dorsal view C, F) lateral view.