Also found in: Thesaurus.
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|Noun||1.||order Ictodosauria - extinct reptiles of the later Triassic period|
animal order - the order of animals
subclass Synapsida, Synapsida - extinct reptiles of the Permian to Jurassic considered ancestral to mammals
ictodosaur - intermediate in form between the therapsids and most primitive true mammals
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