Stiliderus rugulosicollis, Rougemont, 2015

Rougemont, Guillaume De, 2015, Studies on Stiliderus Motschulsky and Stilicoderus Sharp: biogeographical notes and descriptions of new species (Coleoptera: Staphylinidae: Paederinae), Stuttgarter Beiträge zur Naturkunde A, Neue Serie 8, pp. 113-130 : 126

Stiliderus rugulosicollis n. sp.

Holotype (♂): Indonesia, S. Sulawesi, Tanah Toraja, Pulu Pulu , 1700 m, 13.–16.VIII.1990, leg. A. RIEDEL ( SMNS) .

P a r a t y p e: 1 ♀, same data as holotype ( CRO) .

Description

Body length 5.8 mm. Proportions of paratype: length of head: 87; breadth of head: 80; diameter of eye: 25; length of antenna: 195; length of pronotum: 90; breadth of pronotum: 69; length of elytron: 92; breadth of elytra: 100; metatibia: 100; metatarsus: 55.

Black, mandibles, margins of labrum and palpi rufotestaceous; tibia and tarsi dark reddish brown, the latter more or less infuscate; holotype (teneral) with elytra and abdomen brown, antennae and legs entirely testaceous. Fore-body see Fig. 31 .

Male: abdominal sternite VII unmodified; sternite VIII with a broad, very shallow emargination. Aedoeagus see Fig. 19 (the specimens are somewhat teneral; the very weakly sclerotised aedoeagus is collapsed and could not be illustrated in ventral view).

Female: [abdominal segment X missing].

Differential diagnosis

S. rugulosicollis n. sp. runs to S. conicollis from Tanah Toraja in my key to the Celebesian species ( ROUGEMONT 1996: 726). It differs from S. conicollis in its coarser cephalic puncturation, coarser and more regular sculpture of the pronotum, which consists of thick, scarcely interrupted longitudinal rugae leaving the mid-longitudinal band isolated from the first longitudinal rugosity on either side by a deep groove; it differs also in the somewhat smaller and more sparsely punctured elytra, and by an almost total absence of pubescence on the fore-body (short and erect on elytra, forwardly recumbent on pronotum, and particularly conspicuous on head in S. conicollis ), and in the conformation of the aedoeagus.

Figures

Figs. 22–31. Stilicoderus and Stiliderus spp., male sternites VI, VII (22), female sternite XIII (23), male sternite VIII (24, 25, 28), female tergite X (26, 27), fore-body (29–31). – 22. Stilicoderus papuanus n.sp. 23. Stilicoderus sp.X. 24. Stilicoderus sarahae n. sp. 25. Stiliderus germanus n. sp. 26. Stiliderus brendellianus n. sp. 27. Stiliderus sp.Z. 28. Stiliderus agostii n.sp. 29. Stiliderus sp.Z. 30. Stiliderus agostii n.sp. 31. Stiliderus rugulosicollis n. sp. – Scales: 0.5 mm (22–28), 3 mm (29–31).

Figs. 11–21. Stilicoderus and Stiliderus spp., aedoeagi in lateral (a) and ventral (b) views. – 11. Stilicoderus lastianus n. sp. 12. Stilicoderus baliemensis n.sp. 13. Stilicoderus aerosoides n.sp. 14. Stilicoderus papuanus n.sp. 15. Stilicoderus continentalis n. sp. 16. Stilicoderus sarahae n.sp. 17. Stiliderus tengah n. sp. 18. Stiliderus germanus n.sp. 19. Stiliderus rugulosicollis n. sp. 20. Stiliderus brendellianus n.sp. 21. Stiliderus agostii n.sp. – Scales: 0.5 mm.