Also found in: Thesaurus.
Switch to new thesaurus
|Noun||1.||subclass 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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.