Thrinaxodontidae is an extinct family (biology), family of cynodonts that includes the genera ''Thrinaxodon'', ''Nanictosaurus'', and ''Nanocynodon'', and possibly ''Bolotridon'', ''Novocynodon'' and ''Platycraniellus''. All thrinaxodontids share a bony secondary palate. Thrinaxodontids are basal (phylogenetics), basal members of the cynodont clade Epicynodontia. Some studies consider the family a paraphyletic group, representing an evolutionary grade of basal epicynodonts rather than an actual clade.

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Prehistoric cynodonts Early Triassic first appearances Early Triassic extinctions Prehistoric therapsid families {{Paleo-Therapsid-stub