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|Noun||1.||Anapsida - oldest known reptiles; turtles and extinct Permian forms|
class Reptilia, Reptilia - class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates; once the dominant land animals
anapsid, anapsid reptile - primitive reptile having no opening in the temporal region of the skull; all extinct except turtles
order Chelonia, order Testudinata, order Testudines, Testudinata, Testudines, Chelonia - tortoises and turtles
class - (biology) a taxonomic group containing one or more orders