''Crenatosiren'' is an extinct genus of dugongid sirenian known from the late

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 ...

(

Chattian The Chattian is, in the geologic timescale, the younger of two ages or upper of two stages of the Oligocene Epoch/Series. It spans the time between . The Chattian is preceded by the Rupelian and is followed by the Aquitanian (the lowest stage ...

) of Florida, North Carolina, and South Carolina. The type and only known species is ''Crenatosiren olseni''.

Taxonomy

''Crenatosiren'' was originally named ''"Halitherium" olseni'' by Rinehart (1976), who described the species from marine deposits of the late Oligocene (Arikareean NALMA)

Parachucla Formation The Parachucla Formation is a geologic formation in Florida. It preserves fossils dating back to the Paleogene period. Fossil content Mammals Fish Invertebrates See also * List of fossiliferous stratigraphic units in Florida See also * ...

in the

Suwannee River The Suwannee River (also spelled Suwanee River) is a river that runs through south Georgia southward into Florida in the southern United States. It is a wild blackwater river, about long.U.S. Geological Survey. National Hydrography Dataset hig ...

Hamilton County, Florida Hamilton County is a county located in the north central portion of the U.S. state of Florida. As of the 2020 census, the population was 14,004, down from 14,799 at the 2010 census. Its county seat is Jasper. History Hamilton County was crea ...

. Domning (1991) eventually recognized the taxon as more derived than the ''Halitherium'' type species and assigned it to the new genus ''Crenatosiren'', classifying it as a relative of the dugongid '' Rytiodus''.R. H. Reinhart. 1976
Fossil sirenians and desmostylids from Florida and elsewhere
Bulletin of the Florida State Museum Biological Sciences 20(4):187-300 The genus name is derived from the Latin words ''crenatus'' (meaning 'notched') and ''

siren Siren or sirens may refer to: Common meanings * Siren (alarm), a loud acoustic alarm used to alert people to emergencies * Siren (mythology), an enchanting but dangerous monster in Greek mythology Places * Siren (town), Wisconsin * Siren, Wisc ...

''. More specimens of ''C. olseni'' were later found in the

Ashley Ashley is a place name derived from the Old English words '' æsc'' (“ash”) and '' lēah'' (“meadow”). It may refer to: People and fictional characters * Ashley (given name), a list of people and fictional characters with the given name ...

and Chandler Bridge formations of

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 = ...

References

Oligocene sirenians Fossil taxa described in 1991 Prehistoric placental genera {{Paleo-sirenian-stub