Sub-family Hypodontolaiminae

Diagnosis (after Tchesunov, 2014): Cuticle homo- or heterogenous with or without the presence of lateral differentiation of larger dots. Six outer labial papillae and four cephalic setae in two separate circles (except in Megodontolaimus coxbazari). Amphidial fovea distinct or rather obscure, transverse flattened oval, generally located between the four cephalic setae. Stoma funnel shaped, armed with hollow teeth; the larger dorsal tooth maybe opposed by two smaller ventrosublateral teeth, denticles may be present; anterior part of pharynx often with prominent dorsal muscular swelling. Males with cup-like precloacal supplements, rarely absent. Mostly marine but some genera have representatives in freshwater or brackish water (see more detailed in each genus).