Stilicoderus sarahae, 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 : 123-124

Stilicoderus sarahae n. sp.

Holotype (♂): China, Yunnan, Lijiang, Qiaotou ,

14. IV. 2003, in moss and litter by stream, leg. G. DE ROUGEMONT

( CRO). P a r a t y p e s: 4 ♂♂, 4 ♀♀, same data as holotype ( CRO) .

Description

Body length 7.0– 7.5 mm. Proportions of holotype: length of head: 103; breadth of head: 98; diameter of eye: 28; length of antenna: 165; length of pronotum: 98; breadth of pronotum: 87; length of elytron: 108; breadth of elytra: 114; metatibia: 100; metatarsus: 70.

Body entirely black; labrum dark brown; antennae, tibiae and tarsi brown, femora pitchy black. Median tooth of labrum minute, the inner lateral pair large and blunt, the outer lateral pair small, blunt. Head sub-orbicular, without posterior angles, the puncturation fairly coarse and dense, the interstices everywhere narrower than diameter of punctures except in a couple of places at centre of vertex, the punctures slightly elongate. Pronotum densely covered in discrete large flattened setiferous granules, leaving an entire, broad (10–15) smooth impunctate mid-longitudinal band. Elytra with large, deep simple foveate punctures in parts aligned in longitudinal rows, the interstices with sparse, minute granules on whole surface, becoming denser in impunctate apical area. Abdomen densely, finely, homogeneously punctate as in related species.

Male: sternite VIII see Fig. 24 , with a large flat median depression, the surface of this depression dull, densely microsculptate, the posterior margin with a large triangular emargination not abruptly narrowed into a parallel-sided fundus as in S. birmanus . Aedoeagus see Fig. 16 , quite unlike that of S. birmanus , the ventral blade relatively small, in ventral view lanceolate and concave on ventral surface, its apex in lateral view recurved ventrally.

Female: tergite X unmodified.

Differential diagnosis

This new species closely resembles S. birmanus Scheerpeltz 1965 , to which it runs in the key to species in ROUGEMONT 1986a: 149, couplet 59 (60), but single females would not be identifiable without comparison material. The most salient difference between the species is the longer antennae of S. sarahae of which segments 3–11 are all conspicuously elongate; the head of the new species is slightly more elongate and less convex; the pronotum is likewise slightly more elongate, and the granulose puncturation a little sparser and not tending to coalesce into elongate/vermiculate rugae as in S. birmanus ; the legs of S. sarahae , especially the tibia, are slightly longer. The aedoeagi and male 8 th sternites, as can be seen in my 1986a article and the present one, are completely different.

Remark

I have recorded S. birmanus from Yunnan ( ROUGEMONT 1996) based on a single female I took in Kunming, but the occurrence of S. birmanus in China needs confirmation by the presence of males there. In any case the two species are likely to be sympatric, since the type localities are very close together on either side of the Yunnan-Burma border.

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.