Heterotetramelus

Jałoszyński, Paweł, 2018, Taxonomy of ' Euconnus complex'. Part XVIII. Status of subgenera Palaeoconnus Franz and Heterotetramelus Franz (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 4524 (5), pp. 567-580 : 578

Key to subgenera of Heterotetramelus

1. Each mesanepisternum with a brush of dense and long setae directed anterad and visible in dorsal view from under each humerus.................................................................... subgen. Australosciacharoides

-. Mesanepisterna lacking conspicuous setal brushes............................................................ 2

2. Pronotum with two pairs of distinct antebasal pits connected by transverse groove interrupted at middle.................................................................................................... subgen. Sciacharoides

-. Pronotum with transverse groove and at most one lateral pair of distinct antebasal pits, lacking inner pits................ 3

3. Pronotum with a distinct transverse groove connecting small lateral pits; mesoventrite in front of mesocoxae with sharply demarcated median carina, which has a distinct posterior tip.................................... subgen. Tamborinus

-. Pronotum with a faint transverse groove lacking lateral impressions; mesoventrite in front of mesocoxae with indistinct, diffuse carina lacking defined posterior tip........................................... subgen. Heterotetramelus s. str.