Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
OrdoTherapsida
Cladus: Theriodontia
Subordo: Cynodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohort: Theria
Cohort: Eutheria
Magnordo: Epitheria
Superordo: Afrotheria
Cladus: Paenungulata
Ordo: Sirenia
Familia: †Protosirenidae
Genera: †Ashokia – †Libysiren – †Protosiren
Name
Protosirenidae Sickenberg, 1934: 193
References
Primary references
Sickenberg, O. 1934. Beiträge zur Kenntnis tertiärer Sirenen. Mémoires du Musée royal d'histoire naturelle de Belgique 63: 1–352. Online Reference page.
Protosirenidae is an extinct primitive family of the order Sirenia.[1][2]
Protosirenids are thought to have been amphibious quadrupeds, meaning that they spent their time both on land and in the water and had four legs.[3]
See also
Dugongidae
Evolution of sirenians
Manatee
References
D. P. Domning, G. J. Heal, and S. Sorbi. 2017. Libysiren sickenbergi, gen. et sp. nov.: a new sirenian (Mammalia, Protosirenidae) from the middle Eocene of Libya. Journal of Vertebrate Paleontology 37(2):e1299158
http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=43290
Berta, Annalisa; Sumich, James; Kovacs, Kit (2005). Sirenian and Other Marine Mammals: Evolution and Systematics (PDF). Marine Mammals: Evolutionary Biology (2nd ed.). pp. 89–110. ISBN 9780120885527. Retrieved 15 July 2018.
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