Stilicoderus cephalicus, 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 : 115

Stilicoderus cephalicus n. sp.

Holotype (♂): Irian Jaya, Sorong Prov., Waigeo Island ,

Kabui Bay , Wawaiay, 50 m, 14.XI.1996, leg. A. RIEDEL ( NHMW).

Description

Body length 4.5 mm. Proportions of holotype: length of head: 65; breadth of head: 75; diameter of eye: 28; length of antenna: 130; length of pronotum: 65; breadth of pronotum: 58; length and breadth of elytra: 71; metatibia: 73; metatarsus: 38.

In all essentials except the elytral sculpture this species is similar to S. hieroglyphicus and its allies, but in the relative proportions of head, pronotum and elytra it most closely resembles S. laticeps , described above.

Male: abdominal sternites as in S. hieroglyphicus . Aedoeagus see Fig. 3 , with very convoluted parameroid lobes.

Differential diagnosis

The elytral sculpture differs from that of species hitherto described in the hieroglyphicus group: the small setiferous granules that form the ground sculpture of elytra in these species is obsolescent in S. cephalicus , the granules flattened and leaving the surface much more shiny than in related species. The aedoeagus, as in other species, is characteristic.

Figures

Figs. 1–10X. Stilicoderus spp., aedoeagi in lateral (a) and ventral (b) views. – 1. S. laticeps n. sp. 2. S. riedeli n.sp. 3. S. cephalicus n.sp. 4. S. obesus n.sp. 5. S. kolaensis n. sp. 6. S. sepikensis n.sp. 7. S. riedelianus n.sp. 8. S. lobatus n.sp. 9. S. maritimoides n. sp. 10. S. meraukeanus n. sp. 10X. S. batantaensis n. sp. – Scales: 0.5 mm.