Micropeneta papuana, Schawaller & Bellersheim, 2022

Schawaller, Wolfgang & Bellersheim, Aron, 2022, Four new species and new records of Micropeneta Pic, 1921 (Coleoptera: Tenebrionidae: Gnathidiini) from the Oriental and Papuan Regions, including a checklist and an identification key, Zootaxa 5168 (4), pp. 471-478 : 476

Micropeneta papuana sp. n.

( Figs 4 , 11 )

Type material. Holotype: ♂, West Papua (labelled as Irian Jaya), Manokwari, 200 m, 18.III.1993, leg. A. Riedel, SMNS . Paratypes: Same data as holotype, 1 ♀ SMNS . – West Papua (labelled as Irian Jaya), Jayjawljaya, Emdoman, 800–1200 m, 14.–15.IX.1992, leg. A. Riedel, 1 ♀ SMNS .

Description. Body length 3.0– 3.2 mm, body shape ovate. Elytra uniformly coloured dark brown, head, pronotum, antennae and legs somewhat lighter without colour pattern or metallic shine, surface shiny and without distinct setation. Head with small punctures, sparser on clypeus, surface finely shagreened. Clypeal membrane not exposed. Male head at genae with a pair of narrow, long, glabrous, acute horns pointing upright. Eyes small, distinctly globose. Antennae ( Fig. 4 ) 10-segmented with indistinct 4-segmented club. Pronotum widest across middle, 1.4x as wide as long, anterior angles rounded and slightly protruding, posterior angles rectangular, lateral margins regularly rounded, broadly beaded, without distinct dentation, posterior and anterior margins finely beaded; surface of pronotum shining and wrinkled, without punctures, disc convex; prothoracic hypomera without punctures, surface smooth and shiny; prosternal apophysis not protruding backwards. Elytra broad parallel, surface shining, 0.75x as wide as long, widest across middle, with large punctures regularly arranged in rows, diminishing in posterior part of elytra, intervals without punctures; lateral margins with fine dentation and visible in dorsal view nearly over complete length of elytra, humeral angles slightly pronounced; epipleura diminishing somewhat before apex, with a few scattered small punctures, punctures smaller than those on metasternum. Hind wings present. Abdominal ventrites without punctures, last visible ventrite 5 not beaded and without modifications. Legs without specific characters, anterior tibiae triangular, with external keel prolonging to the distal angle, and internally with a brush of light hairs, middle and posterior tibiae rounded in cross section and externally without any keels. Aedeagus ( Fig. 11 ) large in relation to body length and with broad knob-like apicale.

Diagnosis. Micropeneta papuana sp. n. can be recognised by the small body size, by the dark brown dorsal side, by the pair of horns on the male head pointing upright, by the wrinkled and unpunctured disc of the pronotum without modifications, and by the shape of the aedeagus. See also identification key below.

Etymology. Named after Papua, where the type series was collected.

Figures

FIGURES 1–8. Dorsal view of male species of Micropeneta Pic, 1921 (all in SMNS). 1. M. kinabaluca sp. n., holotype. 2. M. alabaca sp. n., holotype. 3. M. excavatifrons Pic, 1921, non-type. 4. M. papuana sp. n., holotype. 5. M. sodalis Bremer, 1997, non-type. 6. M. laotica sp. n., holotype. 7. M. leytica Schawaller, 1994, holotype. 8. M. tarandus (Kaszab, 1946), non-type. Scale bar: 3 mm.

FIGURES 9–13. Aedeagus of species of Micropeneta Pic, 1921 (all in SMNS). 9. M. alabaca sp. n., holotype. 10. M. laotica sp. n., holotype. 11. M. papuana sp. n., holotype. 12. M. sodalis Bremer, 1997, non-type. 13. M. kinabaluca sp. n., holotype. Scale bar: 1 mm.