Ribodon

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Cladus: Therapsida
Cladus: Theriodontia
Cladus: Cynodontia
Cladus: Eucynodontia
Cladus: Probainognathia
Cladus: Prozostrodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohors: Theria
Cohors: Eutheria
Magnordo: Epitheria
Superordo: Afrotheria
Cladus: Paenungulata
Cladus: Tethytheria
Ordo: Sirenia

Familia: Trichechidae
Genus: †Ribodon
Species: †R. limbatus
Name

Ribodon Ameghino, 1883: 112

Type species: Ribodon limbatus
References
Primary references

Ameghino, F. 1883. Sobre una coleccion de mamíferos fósiles del Piso Mesopotámico de la formacion Patagónica recogidos en las barrancas del Paraná por el Profesor Pedro Scalabrini. Boletin de la Academia Nacional de Ciencias en Córdoba (República Argentina) 5: 101–111. BHL Reference page.

Links

Ribodon – Taxon details on Fossilworks.

Ribodon is an extinct genus of manatee that lived around South America (Ituzaingó Formation, then described as Entrerriana Formation, Argentina, Solimões Formation, Brazil and Urumaco Formation, Urumaco, Venezuela) during the Tortonian (Mayoan to Huayquerian in the South American land mammal ages). The type species is R. limbatus.[1]

Ribodon is considered the direct ancestor of the Trichechus genus to which all modern manatees belong and was the first manatee to exhibit supernumerary molars that were replaced throughout life, indicating a diet of abrasive plants.[2] Ribodon is hypothesized to have inhabited both coastal and inland freshwater regions; however, in which of the two it originated is unknown.[3]
References

"The Paleobiology Database". Retrieved 2010-01-01.
Domning, Daryl P. (1982). "Evolution of Manatees: A Speculative History". Journal of Paleontology. 56 (3): 599–619. JSTOR 1304394.
De Souza, Érica Martinha Silva; Freitas, Lucas; Da Silva Ramos, Elisa Karen; Selleghin-Veiga, Giovanna; Rachid-Ribeiro, Michelle Carneiro; Silva, Felipe André; Marmontel, Miriam; Dos Santos, Fabrício Rodrigues; Laudisoit, Anne; Verheyen, Erik; Domning, Daryl P.; Nery, Mariana Freitas (2021). "The evolutionary history of manatees told by their mitogenomes". Scientific Reports. 11 (1): 3564. Bibcode:2021NatSR..11.3564D. doi:10.1038/s41598-021-82390-2. PMC 7878490. PMID 33574363.