Anopidiina, Jeannel & Paulian, 1945

Schawaller, Wolfgang & Purchart, Luboš, 2012, Nanocaecus hlavaci gen. & sp. nov. - first record of the tribe Gnathidiini (Coleoptera: Tenebrionidae: Diaperinae) from the Socotra Archipelago, Acta Entomologica Musei Nationalis Pragae 52, pp. 303-314 : 309-310

Key to the genera of the subtribe Anopidiina from Africa including Madagascar, Mauritius, Seychelles and Socotra

1. Antenna with seven to eight antennomeres including a single terminal broadened antennomere. ............................................................................................................................ 2

– Antenna with ten antennomeres including a terminal club of four antennomeres. ......... 5

2. Antenna with eight antennomeres. ....................................... Paralyreus Grouvelle, 1918

– Antenna with seven antennomeres. ................................................................................. 3

3. Head with prominent or reduced eyes (about 7 ommatides). .......................................... 4

– Head without any eyes (only Seychelles). .................................. Peyrierasia Dajoz, 1974

4. Head with prominent eyes, body long and parallel (widespread in the tropics including Seychelles). .............................................................................. Tyrtaeus Champion, 1913

– Head with reduced eyes, body short and round ( Mauritius). ............................................. .......................................................................................... Mauritianopidium Dajoz, 1977

5. Scutellum invisible. .......................................................... Pseudanopidium Dajoz, 1973

– Scutellum small but visible. ............................................................................................ 6

6. Antennomere 3 distinctly prolonged, about twice as long as antennomere 2; shape of combined pronotum and elytra broadly rounded with the pronotum widest at base. ........ ................................................................................. Anopidium Jeannel & Paulian, 1945

– Antennomere 3 equal in length to antennomere 2; shape of combined pronotum and elytra elongated with the pronotum widest in the middle. ........................................................ 7

7. Last four antennomeres forming a fused club with irregular overall setation; clypeal suture present; pronotum and elytra glabrous; elytra with eight irregular rows of punctures and with short scutellar striolae. .................................................. Paranopidium Dajoz, 1973

– Last four antennomeres forming a compact club with setation near the apex of each segment; clypeal suture absent; pronotum and elytra with microsetae; elytra with irregular punctation and without scutellar striolae. ...................................... Nanocaecus gen. nov.