Rytiodus

Extinct genus of sirenian

Rytiodus Temporal range: Miocene PreꞒ Ꞓ O S D C P T J K Pg N

Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Sirenia
Family:	Dugongidae
Subfamily:	Dugonginae
Genus:	†Rytiodus
Species
R. capgrandi (type species) Lartet, 1886 R. heali Domning, Sorbi, 2011

Rytiodus (meaning Rytina, "wrinkled", an old name for Steller's sea cow)^[1] is an extinct genus of sirenian, whose fossils have been discovered in France, Europe and Libya.

Description

With a length of 6 m (20 ft), Rytiodus was about twice the size as modern sirenians, surpassed only by Steller's sea cow, which was up to 8–9 m (26–30 ft) long. Like its closest modern relatives, the dugongs, Rytiodus had a pair of flippers, a streamlined body and a tail fin. Its flattened snout allowed it to feed in shallow coastal waters. Rytiodus had short tusks which it may have used to extract food from the sand.^[2]

References

^ Dixon, Dougal (2008). World Encyclopedia of Dinosaurs & Prehistoric Creatures. New York: Lorenz Books. pp. 475. ISBN 978-0-7548-1730-7.
^ Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 229. ISBN 1-84028-152-9.

Barry Cox, Colin Harrison, R.J.G. Savage, and Brian Gardiner. (1999): The Simon & Schuster Encyclopedia of Dinosaurs and Prehistoric Creatures: A Visual Who's Who of Prehistoric Life., Simon & Schuster.
David Norman. (2001): The Big Book Of Dinosaurs. Pg.347-348, Welcome Books.

Sirenian genera

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Superorder: Afrotheria
Clade: Paenungulata

Sirenia

†Prorastomidae

Pezosiren
Prorastomus

†Protosirenidae

Ashokia
Libysiren
Protosiren

Trichechidae

†Miosireninae	Anomotherium Miosiren
Trichechinae	†Potamosiren †Ribodon Trichechus

Dugongidae

†Anisosiren †Caribosiren †Halitherium †Indosiren †Lentiarenium †Kaupitherium †Metaxytherium †Paralitherium †Priscosiren †Prohalicore †Stegosiren †Sirenavus
†Hydrodamalinae	Dusisiren Hydrodamalis
Dugonginae	†Bharatisiren †Callistosiren †Crenatosiren †Corystosiren †Culebratherium †Dioplotherium †Domningia Dugong †Italosiren †Kutchisiren †Nanosiren †Norosiren †Rytiodus †Xenosiren