Cetotherium

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.