Mammal families

Pontoporiidae is a family of toothed whales, containing the extant genus Pontoporia, and ten extinct genera. Pontoporia contains the sole extant species, the La Plata dolphin, which is endemic to South America.

Neobalaenidae is a defunct family of baleen whales (suborder Mysticeti) including the extant pygmy right whale. Although traditionally considered related to balaenids, recent studies by Fordyce and Marx (2013) and Ludovic Dutoit and colleagues (2023) have recovered the living pygmy right whale as a member of Cetotheriidae, making it the only extant cetotheriid. Not all authors agree with this placement.

Pantolambdidae is an extinct family of pantodont mammal in the order Pantodonta.

extinct family of mammals