Aegialia (Silluvia) yunnanica, 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 : 43-44

Aegialia (Silluvia) yunnanica , sp. n.

Figs. 1–3 , 13

Type material. Holotype, male with the label " CH, W Yunnan, NE Fugong 26 56 30 N / 98 55 14 E 26 56 46 N / 98 56 13 E H= 2690–3240 m, 30.05.2006, Belousov & Kabak leg." Paratypes: 2 females with same label as the holotype; male with the label " China: Yunnan Lanping Co., Lajing, Fuhe vill., near Chanyanshan Pass, 20.VIII.2007 ".

Description. Holotype, male ( Fig. 1 ). Body length 6.2 mm. Body uniformly black, shiny, tarsi testaceous. Clypeus rounded, without emargination in the middle. Genae indistinct, genal and frontoclypeal sutures almost absent, only feebly marked as smooth lines laterally. Eyes very small in dorsal view. Clypeus and frons densely, evenly punctate (punctures separated by 1 puncture diameter); anterior part of clypeus with sparser and smaller 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 very slightly 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 a bit shorter than tarsomere 1, tarsomere 1 as long as tarsomere 2–4 combined.

Parameres with well sclerotised apices distinctly protruding medially ( Fig. 2 ). Internal sac of aedeagus with 3 distinct sclerites, one of which is relatively long and depressed (indicated in Fig. 3 ).

Female. Distinguished from male by the anterior tibial spur not curved inward, clypeus with only minute sparse punctures, slightly distinct genae, and upper spur of hind tibia being slightly longer than tarsomere 1.

Variability. Body length of paratypes varies from 6.5–7.0 mm. Posterior angles of the pronotum are weakly serrate in one specimen.

Differential diagnosis. Aegialia (Silluvia) yunnanica sp. n. can be separated from other described Silluvia species by the parameres with well-sclerotised apices distinctly protruding medially and internal sac sclerites with one relatively long and depressed sclerite. From A. shashi Stebnicka, 1977 , it can also be separated by the densely and uniformly punctate head; and from A. (S.) kabaki and A. (S.) wassuensis ( Petrovitz, 1963) by smooth posterior angles of pronotum. Females of A. yunnanica are similar to the holotype of A. elongata Landin, 1948 (redescribed by Stebnicka 1977) but can be separated from it in having more sparsely punctate clypeus and by the first tarsomere being shorter then 3 following tarsomeres combined.

Distribution. Aegialia yunnanica sp. n. is known from western Yunnan Province of China ( Fig. 13 ).

Etymology. The species name was derived from the Chinese Province of Yunnan, where the type series was collected.

Figures

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

FIGURES 1 – 3. Aegialia (Silluvia) yunnanica, sp. n., holotype. Fig 1. Habitus. Fig. 2. Aedeagus in dorsal and lateral view. Fig 3. Internal sac of aedeagus. Scales: A – refers to Fig 1; B – refers to Figs 2, 3.