''Coronodon'' is a genus of toothed

mysticetes Baleen whales (systematic name Mysticeti), also known as whalebone whales, are a parvorder of carnivorous marine mammals of the infraorder Cetacea (whales, dolphins and porpoises) which use keratinaceous baleen plates (or "whalebone") in the ...

from the Early

Oligocene The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the ...

Ashley Formation The Ashley Formation is a geologic formation in South Carolina. It preserves fossils dating back to the Paleogene period Period may refer to: Common uses * Era, a length or span of time * Full stop (or period), a punctuation mark Arts, ente ...

South Carolina )''Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no) , anthem = " Carolina";" South Carolina On My Mind" , Former = Province of South Carolina , seat = Columbia , LargestCity = Charleston , LargestMetro = ...

Description

It was about the same size as ''

Dorudon ''Dorudon'' ("spear-tooth") is a genus of extinct basilosaurid ancient whales that lived alongside ''Basilosaurus'' 40.4 to 33.9 million years ago in the Eocene. It was a small whale, with ''D. atrox'' measuring long and weighing . ''Dorudon'' ...

'', measuring long and weighing . The rostrum of ''Coronodon'' is wide, judging by its straight sides and short mandibular symphysis. Despite being similar to some archaeocetes in having a rostrum that is twisted counterclockwise in anterior view, it differs in having posterior teeth with subequal cusps and an upturned anterior process of the maxilla. ''Coronodon'' differs from other toothed mysticetes in having anterior lower molars labially overlapping posterior lower molars. *

Phylogeny

''Coronodon'' falls basally within Mysticeti, being closely related to the unnamed taxon ChM PV 5720 and more primitive than ''" Metasqualodon" symmetricus'',

Aetiocetidae Aetiocetidae is an extinct family of toothed baleen whales known from the Oligocene. The whales are from the North Pacific Ocean and ranged in size from long. Many of the described specimens were discovered from the Upper Oligocene of the Japa ...

Mammalodontidae Mammalodontidae is a family of extinct whales known from the Oligocene of Australia and New Zealand. There are currently two genera in this family: ''Janjucetus'' and ''Mammalodon''. After a new cladistic analysis by Fitzgerald (2010), ''Janjuce ...

, and ''

Llanocetus ''Llanocetus'' ( "Llano's whale" ) is a genus of extinct toothed baleen whales from the Late Eocene of Antarctica. The type species, ''Llanocetus denticrenatus'', reached gigantic proportions, with the juvenile specimen reaching an estimated i ...

''.

References

Prehistoric cetacean genera Fossil taxa described in 2017 Oligocene cetaceans {{paleo-whale-stub