†FAMILY WAIKALASMATIDAE ROSS & NEWMAN, 2001

Diagnosis: Shell symmetrical, with eight solid, weakly articulated plates; single pieces of wide carina and narrow rostrum, paired rostromarginals, marginals and carinomarginals; alae well developed, radii absent; shell with two or more whorls of imbricating plates; basis membranous; caudal appendages absent.

Waikalasma Buckeridge, 1983 (Miocene–Recent) (three species)