Sternotrigon Skopin
Creators: name: Ba, Yi-Bin
name: Ren, Guo-Dong
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Tenebrionidae
Sternotrigon

description: Key to the Chinese species of Sternotrigon Skopin
1. Mesosternum evenly arched longitudinally; never hump-like, hunched, or conically produced forward (Fig. 6, 19, 32, 71)... 2
- Mesosternum hump-like, hunched, often conically produced forward (Fig. 45)..................................... 7
2. Elytral humeri entirely visible in dorsal view; humeral rows clear, granules significantly coarser than in the humeri........ 3
- Elytral humeri not, or only partially visible in dorsal view, granules similar as in the humeri; mesosternum approximately flat; protibiae strong, knife-edge of outer margin jagged; the 3rd and 4th segments of antennae with densely long setae on apex in the male; length 17.0– 20.5 mm ........................................................................ S. zichyi
3. Elytra without or with inconspicuous 1st and 2nd ribs; prosternal process short, apex somewhat curved................... 4
- Elytral 1st and 2nd ribs obvious; prosternal process long, apex vertical; elytra shortly oval, lateral margins rather strongly rounded, shoulder entirely flat round, humeral rows inconspicuously rib-shaped; under margin of femora finely and sparsely granuliferous; length 18.0 mm..................................................................... S. hiekiei
4. Elytra without wrinkles or punctures, with obvious setae, small granules uniform and becoming faint towards elytral suture; humeri with finely granules; pseudoepipleuron sparsely covered in fine granules, the granules often faint; prosternal process short; ventral margins of femora with sparsely fine granules....................................................6
- Elytra with irregular wrinkles, often with vestiges of longitudinal ribs, without obvious setae, granules crassitude; humeri with larger granules; pseudoepipleuron densely covered in larger granules; prosternal process long; ventral margins of femora with dense flat larger tubers................................................................................. 5
5. Body with obvious white setae in dorsal view; labrum conversely trapezoidal; anterior margin of clypeus straight; 3rd antennomere 5.7 times as long as broad; apex of prosternal process without border, and thick in lateral view; length of protibial spurs approximately equal to basal two segments of tarsi; length 19.0– 22.5 mm ................................. S. albipulis
- Body without obviously white setae in dorsal view; labrum approximately square; anterior margin of clypeus concave; 3rd antennomere 4.0 times as long as broad; apex of prosternal process with thick border, and thin in lateral view; length of protibial spurs approximately equal to basal four segments of tarsi; length 17.0–19.0 mm.......................... S. grandis
6. Disc of pronotum weakly arched in lateral view; the granules of elytral rows erect and dense; outer margins of protibiae jagged only at apex (Fig. 30); pseudoepipleuron without setae; length 15.0–20.0 mm............................... S. kraatzi
- Disc of pronotum strongly arched in lateral view; the granules of elytral rows sparse; outer margins of protibiae jagged along nearly entire length; pseudoepipleuron with dense short setae; length 18.0 mm............................... S. opaca
7. Humera of elytra strongly acute, extended forward in dorsal view; disc of pronotum nearly flat medially; prosternal process strongly extended backward; length 17.0–19.0 mm............................................... S. setosa setosa
- Humera of elytra obsolete in dorsal view; disc of pronotum slightly arched medially; prosternal process shorter, usually curved; length 17.0–19.0mm................................................................ S. setosa juvencus
description: Published as part of Ba, Yi-Bin & Ren, Guo-Dong, 2013, Taxonomy and distribution of Sternotrigon Skopin in China (Coleoptera, Tenebrionidae), pp. 568-578 in Zootaxa 3693 (4) on page 569, DOI: 10.11646/zootaxa.3693.4.9, http://zenodo.org/record/223949