Genus Amphimedon Duchassaing & Michelotti, 1864

Definition: Niphatidae with an optically smooth surface, regular tangential ectosomal network with rounded meshes of a single size. Ends of choanosomal longitudinal primary fibers barely protruding. Spongin abundant. Microscleres absent (Desqueyroux-Faúndez & Valentine 2002).

Type species: Amphimedon compressa Duchassaing & Michelotti, 1864 (by subsequent designation, de Laubenfels 1936).