Aegialia (Silluvia) igori, Frolov, Andrey V., 2008

Frolov, Andrey V., 2008, New and little known species of the subgenus Aegialia (Silluvia) (Coleoptera, Scarabaeidae: Aphodiinae) from the Sino-Tibetan mountains, Zootaxa 1712, pp. 42-48 : 45-46

Aegialia (Silluvia) igori , sp. n.

Figs. 7–9 , 13

Type material. Holotype, male with the label " CH, N Sichuan, SW Baima 32 43 26 N / 104 15 58 E H= 2640 m, 22.06.2006, Belousov & Kabak leg." Paratypes: 2 females with the same data as the holotype and 1 male with the label “ CH, S Sichuan, 35km NNW Mianning, NW of Lajiajia upper Anteriorst zone 3400 m, 4.08.2002, Belousov & Kabak leg."

Description. Holotype, male ( Fig. 7 ). Body length 6.8 mm. Body black, shiny, legs, genal margins and lateral margins of pronotum somewhat reddish-black. Clypeus rounded, without medial emargination. Genae feebly distinct, genal and frontoclypeal sutures indistinct. Eyes very small in dorsal view. Frons densely and evenly punctate (punctures separated by less than a puncture diameter, sometimes touching). Clypeus sparsely punctate with minute punctures.

Pronotum coarsely punctate (punctures separated by 1–2 diameters on disc, becoming denser laterally). Lateral and basal margins coarsely punctate, posterior angles rounded and not serrate.

Scutellum triangular, impunctate basally, shiny.

Elytra with strong humeral teeth. Striae deep, punctate (punctures of striae separated by 2–3 puncture diameters; each puncture bears 1 minute yellow seta). Intervals slightly convex, impunctate.

Anterior tibiae with short lateral teeth; tibial spur slightly curved inward. Upper spur of hind tibia slightly longer than tarsomere 1, tarsomere 1 shorter than tarsomere 2–4 combined.

Parameres relatively long, their apices rounded in lateral view, with small feebly sclerotised area ( Fig. 8 ). Internal sac of aedeagus with 3 sclerites one of which is somewhat rounded, with small process (indicated in Fig. 9 ).

Female. Distinguished from male by the anterior tibial spur not curved inward and by the more sparsely punctate frons.

Variability. Body length of paratypes vary from 6.5–7.0 mm, otherwise, except for the sexual dimorphism, they are similar to the holotype.

Differential diagnosis. Aegialia (Silluvia) igori sp. n. can be separated from other described Silluvia species by the relatively depressed and rounded (in lateral view) apices of parameres and by the shape of internal sac sclerites ( Fig. 9 ). It is most similar to A. shashi but can be separated from this species by the indistinct frontoclypeal suture and by the clypeus punctate with sparse, minute punctures. From A. (S.) kabaki and A. (S.) wassuensis , it can be separated by posterior angles of pronotum not serrate.

Distribution. Aegialia igori sp. n. is known from two localities in Sichuan Province of China ( Fig. 13 ). Etymology. The species is named after Igor Belousov.

Figures

FIGURE 13. Distribution map of the four species of Silluvia discussed in this paper.

FIGURES 7 – 9. Aegialia (Silluvia) igori, sp. n., holotype. Fig 7. Habitus. Fig. 8. Aedeagus in dorsal and lateral view. Fig 9. Internal sac of aedeagus. Scales: A – refers to Fig 7; B – refers to Figs 8, 9.