Grouvellinus elongatus, 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 : 259-260

Grouvellinus elongatus sp. nov.

( Figs 1C–D , 6A–C , 13D–F )

Type material examined: holotype, male ( IAECAS): “ China: Yunnan (8) / Dali City, Yongping / County , Jinguan Templeļ 25°11′48″N 99°31′48″E / 2399 m, 2018.10.19 / Leg. Peng, Dong & Zhu” . Paratypes: 2 males ( IAECAS), the same data as ; 1 male ( IAECAS): “ China: Yunnan (15) \ Baoshan, Mangkuan / Sandieshui | 98°50’16” E 25°26’25” N / 1135 m, 2018.10.22 / Leg. Peng, Zhu, Dong” ; 1 male, 2 females ( IAECAS): “ China: Yunnan Prov. / 6.5 km W Tongbiguan / 24°36.8′ N 97°36.4′ E, / 25. VI. 2016, 1280 m / J. Hájek & J. Ruzicka ” ; 1 male ( IAECAS): “ China: Yunnan (17) | 25°18′28″N 98°47′36″, / 1562 m, 2019.7.2 / Leg. Peng, Dong & Zhu.” ; 1 male, 2 exs. ( NHMW): “ China: Yunnan 14.21.6 / 100 km W Baoshan , 1993 / Gaoligongshan Nat. Res. / E. Jendek & O. Sauss leg.”

Diagnosis. Body broadly obovate, dark brown to black; pronotum broadest at basal 0.4, distinctly attenuated anteriorly; disc of pronotum without median carina or sulcus, sublateral carinae present in basal 0.3 on pronotum; elytral strial punctures small; prosternal process gradually narrowed from base to the apex. This species is large and robust, and it is similar to the known species G. hercules Jäch, 1984 and G. tibetanus Jäch, 1984 which have the similar body size, but it can be easily distinguished from G. hercules Jäch, 1984 and G. tibetanus Jäch, 1984 by its stronger habitus, male genitalia distinctly slimmer and longer, and also by its penis distinctly overreaching the parameres.

Description. Habitus see Figs 1C–D . Body broadly obovate. BL 3.1 mm, BW 1.5 mm. Dark brown to black, legs ferruginous, antennae and anterior margin of labrum yellowish brown.

Head. Labrum smooth and shining, sparsely punctate and pubescent. Clypeus and frons black, smooth and shining, punctures and pubescence denser than on labrum.

Pronotum ( Fig 6A ) distinctly convex, PL 1.0 mm, PW 1.25 mm, broadest at basal 0.4, distinctly attenuated anteriorly and gradually narrowed posteriorly, surface smooth and shining, densely covered with yellowish setiferous punctures, with some sparse granules near anterior and posterior angles. Sublateral carinae present in basal 0.3, a shallow groove from apex of sublateral carina towards anterior angle on each side. Median carina absent. A pair of small impressions are in front of anterior angles of scutellum. Scutellum heart-shaped.

EL 2.1 mm, EW 1.5 mm. Elytra subparallel in basal 2/3, then distinctly attenuated posteriorly. Strial punctures small, separated by 1–2 times of their diameters in basal half, then well separated and smaller in distal half (separated by 3–5 times of diameters). Intervals 2–5 distinctly convex in basal half. Intervals 7, 8 carinate. Pubescence on intervals 1, 3, 5, 7 more developed.

Prosternal process ( Fig. 6B ) gradually narrowed from base to apex, lateral margin distinctly rimmed, apex broadly rounded; disc smooth and shining, with a few punctures and setae in basal 2/5, coarse in distal 3/5. Metaventrite ( Fig. 6C ) with disc broadly impressed, surface coarse, small punctures and pubescence sparsely distributed, an oblique row of very large punctures behind mesocoxa and a shallow groove in front of metacoxa, lateral area densely pubescent.

Disc of ventrites I–IV smooth and shining, sparsely punctate and pubescent, lateral area densely pubescent. Ventrite V smooth and shining, and densely punctate on disc in basal half, the other area densely granulated and pubescent ( Fig 6C ).

Aedeagus ( Figs 13D–F ). 1.1 mm long. Penis is about 1.4 times as long as phallobase. Penis slightly constricted at basal 0.2, then slightly narrowed towards apex, the apex narrowly rounded. Parameres distinctly shorter than the penis, slim, subparallel in basal 2/3, distinctly narrowed towards apex in distal 1/3.

Males: BL 2.7–3.1 mm, BW 1.4–1.5 mm (n=7); females: BL 2.6–2.7 mm, BW 1.3–1.4 mm (n=2).

Distribution. China: Yunnan.

Etymology. The epithet is derived from the Latin adjective “elongatus” and refers to the elongated male aedeagus.

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 6. Grouvellinus elongatus 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.