Micrillus sumbaensis ( 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 : 1509

Micrillus sumbaensis ( SCHEERPELTZ 1957) , nov.comb. ( Figs 44-47 )

Scimbalium sumbaense SCHEERPELTZ 1957: 232 , 300 ff.

Type material examined: Holotype: " / Sumba, 7 - Melolo , 25.5.49 / Lichtfang / Sumba-Exped. d. Naturhist. Mus. Basel 1949 / Expedition Bühler-Sutter / Scimbalium sumbaense nov. sp. / Typus Scimablium sumbaense O. Scheerpeltz / Micrillus sumbaensis (Scheerpeltz) , det. V. Assing 2013" ( NHMB) . Paratypes: 1: same data as holotype, but "Cotypus..." ( NHMB) ; 1, 1: same data as before, but "O-Sumba, 3 - Melolo, 24.5.49" ( NHMB, NHMW) .

Comment: The original description is based on a male holotype and three paratypes (one male and two females) ( SCHEERPELTZ 1957) deposited in the NHMB and in the NHMW.

Redescription: External characters as in M. distortus , distinguished only by the male sexual characters.

: sternite VIII ( Fig. 44 ) very weakly oblong, posterior excision narrow and rather deep, its depth approximately one third the length of sternite; aedeagus 0.38 mm long, shaped as in Figs 45-47.

Comparative notes: The similar external morphology and the similarly derived male sexual characters suggest that M. sumbaensis is the adelphotaxon of M. distortus , from which it differs by the less oblong and posteriorly more deeply incised male sternite VIII, the shape of the ventral process of the aedeagus both in lateral and in ventral view (broader in ventral view and subapically of different shape in lateral view), and by the shape of the apical internal structure.

Distribution and natural history: Micrillus sumbaensis is currently known only from Sumba, Indonesia. The type specimens were collected at a light source. According to SCHEERPELTZ (1957), the species is paludicolous.

Figures

Figs 44-47: Micrillus sumbaensis (SCHEERPELTZ), holotype: (44) male sternite VIII; (45-46) aedeagus in lateral and in ventral view; (47) internal structure of aedeagus in dorsal view. Scale bars: 0.2 mm.