Cetotherium

Cetotherium ("whale beast") is an extinct genus of baleen whales from the family Cetotheriidae.

==Taxonomy== thumb|left|C. riabinini skull The family Cetotheriidae and the genus Cetotherium (sensu lato) have been used as wastebaskets for all kinds of baleen whales, most notably by , Spassky (1954) and . Based on more recent phylogenetic studies and revisions of many 19th century genera, much smaller monophyletic Cetotheriidae and Cetotherium sensu stricto is limited to a single or only a few species. For example, included only C. rathkii and C. riabinini in the genus and only ten genera in the family.