Key to genera within Cotasteromimina

1. Elytra oval, anterolateral angle of elytron (humeral callus) rounded, not present.................................... 2

- Elytra cylindrical, anterolateral angle of elytron (humeral callus) present......................................... 3

2. Femoral teeth absent... Cotasteromimus ( C. morimotoi Chûjô & Voss, 1960, C. squamiger Morimoto & Miyakawa, 1985, C. philippinensis Legalov, 2020).

- Femoral teeth present................................................... Cotasteromorphus chujoi Kojima, 2005

3. Frons vertical, rostrum straight, procoxae separated by their diameter..................................................... Seticotasteromimus ( S. jarawa Germann, 2013, S. brunomanseri Germann 2021, S. crassirostris Germann, 2022).

- Frons horizontal, rostrum curved, procoxae contiguous or maximally separated by half of a coxal diameter.............. 4

4. Anterior margin of prothoracic venter with rectangular notch and a fringe of characteristic flattened bristles..................................................................................... Obhylius arboricola Germann 2021

- Anterior margin of prothoracic venter simply rounded, without any fringe........................................ 5

5. Body without raised clubbed dark scales, only adjacent and bowed light brown scales, antennae with second antennomere of funicle not partly hidden in first.................................. Zembrus perseus Germann & Grebennikov, 2020

- Body with raised clubbed dark scales, antennae with second antennomere of funicle partly hidden in first............... 6

6. Raised scales on elytra grouped in tufts on uneven elevated interspaces, these discontinuously divided into bulges. Elytra dorso-ventrally flattened with elongate-rounded elytral declivity in lateral view. Ventrites 3–4 3 times wider than long.............................................................................. Pseudohylobius setosus Morimoto, 1962

- Raised scales on elytra in rows on uneven elevated interspaces, these continuous. Elytra cylindrical with steep elytral declivity in lateral view. Ventrites 3–4 5 times wider than long................................ Setizembrus Germann gen. nov.