Micrillus sutteri ( SCHEERPELTZ 1957) Assing, 2013

Assing, V., 2013, On the Palaearctic and Oriental species of Scymbalium and Micrillus (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 45 (2), pp. 1479-1520 : 1502-1503

Micrillus sutteri ( SCHEERPELTZ 1957) , nov.comb.

( Figs 29-32 )

Scimbalium sutteri SCHEERPELTZ 1957: 232 , 302 ff.

Type material examined Holotype: " / 582 W-Sumba, Waikarudi, 3.- 7.9.49, Lichtfang / Sumba-Exped. d. Naturhist. Mus. Basel 1949 / Expedition Sühler-Sutter / Scimbalium Sutteri nov. sp. / Holotypus Scimbalium Sutteri O. Scheerpeltz / Micrillus sutteri (Scheerpeltz) , det. V. Assing 2013" ( NHMB) . Paratypes: 1, 2: same data as holotype, but "Cotypus..." (NHMB, NHMW).

Comment: The original description is based on a male holotype and three paratypes, a male and two females, from Sumba ( SCHEERPELTZ 1957). The specimens were located in the collections of the NHMB and the NHMW.

Redescription: Body length 5.0-6.0 mm; length of forebody 2.6-2.7 mm. Coloration: body pale reddish, with the posterior portion of the head indistinctly darker; legs and antennae dark-yellow.

Head approximately as long as broad, weakly convex in cross-section, and with moderately marked posterior angles; lateral margins behind eyes subparallel in dorsal view; dorsal surface with sparse punctation and with shallow microsculpture; eyes approximately 0.6-0.7 times as long as postocular region. Antenna approximately 1.8 mm long and slender, preapical antennomeres noticeably oblong.

Pronotum approximately 1.15 times as long as broad and as broad as head, broadest near anterior angles, distinctly tapering posteriorly, and weakly convex in cross-section; dorsal surface with fine and rather sparse micropunctation, without distinct macropunctation, at most with a few scattered macropunctures; microreticulation absent.

Elytra approximately 0.95 times as long as pronotum; punctation very dense and fine. Hind wings fully developed.

Abdomen with moderately dense and fine punctation; interstices with shallow microsculpture.

: sternite VIII ( Fig. 29 ) distinctly oblong, posterior excision narrow, its depth nearly one third the length of sternite; aedeagus ( Figs 30-32 ) 0.5 mm long and weakly asymmetric; ventral process slender and apically bifid in ventral view; dorso-apical structure long, slender, and apically curved; internal sac with large and curved sclerotized structure, this structure apically with finger-shaped processes.

Comparative notes: Based on the similar external characters, the similar shape of the male sternite VIII, and particularly the similarly derived morphology of the aedeagus (slender ventral process, apically curved dorso-apical structure, presence of a large, curved, and apically finger-shaped internal structure), M. sutteri is undoubtedly closely allied to M. intermedius , from which it differs by larger body size, the paler head (only indistinctly darker than pronotum at most), and by the differently shaped ventral process and dorso-apical structure of the aedeagus. In M. intermedius , the ventral process is apically not bifid in ventral view, and the dorso-apical structure is much shorter and more strongly curved.

Distribution: Micrillus sutteri is currently known only from the type locality in Sumba, Indonesia.

Figures

Figs 29-35: Micrillus sutteri (SCHEERPELTZ), holotype (29-32) and M. flavescens (MOTSCHULSKY) (lectotype of M. asperiventris (FAUVEL)) (33-35): (29) male sternite VIII; (30-31) aedeagus in lateral and in ventral view; (32) internal and dorso-apical structures of aedeagus in lateral view; (33) habitus; (34) forebody; (35) spermatheca. Scale bars: 33-34: 1.0 mm; 29-33: 0.2 mm; 35: 0.1 mm.