Dinopedia
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Toxodontidae
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Toxodon platensis
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Notoungulata
Family: Toxodontidae
Owen, 1845
Subfamilies and Genera

Toxodontidae is an extinct family of notoungulate mammals known from the Oligocene epoch through the Pleistocene epoch of South America, with one genus, Mixotoxodon, also known from the Pleistocene of Central America and South Western North America (Texas). They somewhat resembled rhinoceroses superficially, and had teeth with high crowns and open roots, suggesting that they also fed on tough pampas grass.  However, isotopic analyses have led to the conclusion that were grazing and browsing generalists.

Classification[]

In 2014, a study identifying a new species of toxodontid resolved the families phylogenetic relations. The below cladogram was found by the study:[1]



Pampahippus arenalesi





Rhynchippus spp.




Scarritia canquelensis



Leonitinia gaudri




Toxodontidae

Proadinotherium leptognathum





Adinotherium spp.




Nesodon taweretus



Nesodon imbricatus






Palyeidodon obtusum




Hyperoxotodon speciosus





Nonotherium henningi



Xotodon spp.






Andinotoxodon bolivariensis





Dinotoxodon paranensis



Toxodon platensis





Gyrinodon quassus




Ocnerotherium intermedium



Hoffstetterius imperator








Posnanskytherium desaguaderoi




Pisanodon nazari




Pericotoxodon platignathus





Calchaquitherium mixtum



Mixotoxodon larensis





Paratrigodon euguii



Trigodon gaudri















  1. (2014) "New toxodontid (Notoungulata) from the Early Miocene of Mendoza, Argentina". Paläontologische Zeitschrift. DOI:10.1007/s12542-014-0233-5. 
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