Micropeneta Pic, 1921

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 : 477

Identification key for the species of Micropeneta Pic, 1921

(suitable for males only)

1 Anterior margin of male pronotum modified with a pair of teeth, a pair of swellings or anterior part of male pronotum with broad impression..................................................................................... 2

– Anterior margin and anterior part of male pronotum without any modifications.................................... 7

2 Anterior part of male pronotum with broad impression, anterior margin without teeth or swellings..................... 3

– Anterior margin of male pronotum with a pair of teeth or with a pair of flat swellings............................... 4

3 Head armature of male only short, tubercle-like and not bifurcated, disc of pronotum between punctures shining, lateral margins of pronotum weakly rounded. Fig. 3 ............................................................. excavatifrons

– Head armature of male longer, broad and bifurcated, disc of pronotum between punctures shagreened, lateral margins of pronotum strongly rounded. Fig. 2 ...........................................................…. alabaca sp. n.

4 Anterior margin of male pronotum with a pair of teeth........................................................ 5

– Anterior margin of male pronotum with a pair of flat swellings.............................................. qilin

5 The pair of teeth at anterior margin of pronotum narrowly situated (see figure in Bremer & Ferrer (1994))........ mjoebergi

– The pair of teeth at anterior margin of pronotum widely separated ( Figs 5, 6 )...................................... 6

6 Antenna with 4-segmented club, horns on the male head broad and bifurcated, pointing upright, body elongated parallel. Fig. 6 ........................................................................................ laotica sp. n.

– Antenna without club, horns on the male head narrow and acute, pointing backwards, body broader. Fig. 5 ......... sodalis

7 Body length 7.0 mm, male head with a pair of broad, long, glabrous processes, apices rounded and bent inwards, lateral margins of pronotum strongly rounded, pronotal disc between fine punctures shagreened. Fig. 1 ................. kinabaluca sp. n.

– Body length 3–5 mm, male head with a pair of narrow, long, glabrous horn, apices acute and pointing upright or backwards, lateral margins of pronotum slightly rounded or nearly straight, pronotal disc between punctures shining or unpunctured and wrinkled............................................................................................ 8

8 Body length 3.0– 3.2 mm, male head with a pair of acute horns pointing upright, lateral margins of pronotum slightly rounded, pronotal disc wrinkled and unpunctured. Fig. 4 ................................................... papuana sp. n.

– Body length 3.5–5 mm, male head with a pair of acute horns pointing backwards or to the sides, lateral margins of pronotum nearly straight, pronotal disc with fine punctures, smooth and shining............................................ 9

9 Elytra with irregular placed punctures not arranged in distinct rows with intervals. Fig. 7 ........................ leytica

– Elytra with punctures arranged in distinct rows with intervals................................................. 10

10 Body length 3.5 mm, horns on male head shorter and pointing to the sides.................................. testacea

– Body length 4.5 mm, horns on male head longer and pointing backwards. Fig. 8 ............................ tarandus

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.