Grouvellinus, Champion, 1923

Bian, Dongju & Jäch, Manfred A., 2019, Revision of the species Grouvellinus Champion, 1923 (Coleoptera: Elmidae) with long median pronotal carina, including descriptions of four new species from China, Zootaxa 4586 (1), pp. 127-140 : 140

Key to the males of the species of Grouvellinus with long median pronotal carina

1. Body broadly obovate, thick, metaventrite with a pair of admedian carinae ( Figure 8 C )............... G. robustus sp. nov.

- Body elongate obovate, slender, metaventrite without admedian carinae.......................................... 2

2. Penis (without apophyses) slightly longer than phallobase; apex of penis broadly rounded ( Figure 10 A–C).............................................................................................. G. mediocarinatus sp. nov.

- Penis (without apophyses) distinctly longer than phallobase; apex of penis not broadly rounded........................ 3

3. Male genitalia about 0.70 mm long, apex of penis more distinctly acuminate ( Figure 9 D–F)........ G. longiusculus sp. nov.

- Male genitalia less than 0.65 mm long, apex of penis less distinctly acuminate..................................... 4

4. Pronotum distinctly attenuate anteriorly, median pronotal carina more strongly elevated ( Figure 5A ); penis smaller, less than 0.60 mm ( Figure 9 A–B)............................................................ G. hongkongensis sp. nov.

- Pronotum slightly attenuate anteriorly, median pronotal carina less strongly elevated ( Figure 4 A ); penis strong, more than 0.60 mm long ( Jäch 1984: Figure 20).......................................................... G. bishopi Jäch, 1984

Figures

FIGURE 4. Grouvellinus bishopi. A) anterior part of body, dorsal view; B) same, ventral view; C) posterior part of body, ventral view.

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

FIGURE 8. Grouvellinus robustus. A) anterior part of body, dorsal view; B) same, ventral view; C) posterior part of body, ventral view.

FIGURE 9. Aedeagus. A–C) Grouvellinus hongkongensis; D–F) G. longiusculus; A, D) in ventral view; B, E) in dorsal view; C, F) in lateral view. Scale: 0.2 mm.

FIGURE 10. Aedeagus. A–C) Grouvellinus mediocarinatus. D–F) G. robustus. A, D) in ventral view; B, E) in dorsal view; C, F) in lateral view. Scale: 0.2 mm.