Mesotherium

Mesotherium ("Middle Beast") is an extinct genus of mesotheriid, a long-lasting family of superficially rodent-like, burrowing notoungulates from South America. It one of the youngest notoungulates, and the last known member of Typotheria. It was first named by Étienne Serres in 1867, and only contains a single species, Mesotherium cristatum, spanning the Early-Middle Pleistocene.

Mesotherium
Temporal range:
Skull of Mesotherium cristatum
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Notoungulata
Family: Mesotheriidae
Subfamily: Mesotheriinae
Genus: Mesotherium
Serres, 1867
Type species
Mesotherium cristatum
Serres, 1857
Synonyms
  • Mesotherium:
    • Typotherium
  • Mesotherium cristatum
    • M. hystatum Ameghino 1904
    • M. maendrum Ameghino 1887
    • M. pachygnathum Gervais & Ameghino 1880
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