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vascular fetal membrane that develops from the hindgut in embryonic higher vertebrates (reptiles, birds and mammals) allantois
either of two amphibious reptiles related to crocodiles but with shorter broader snouts alligator , gator
thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) amnion , amnios , amniotic sac
higher vertebrates (reptiles, birds and mammals) possessing an amnion during development Amniota
oldest known reptiles: turtles; extinct Permian forms Anapsida , subclass Anapsida
extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts archosaur , archosaurian , archosaurian reptile
large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts Archosauria , subclass Archosauria
heart (as of mammals and birds and reptiles) having two auricles biauriculate heart
outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals) chorion
shrew-sized protomammal from the Alberta region of Canada; from about 55 million years ago (much more recent than other mammal-like reptiles) Chronoperates paradoxus
sharp curved horny process on the toe of a bird or some mammals or reptiles claw
genital opening of birds, fish, reptiles cloaca
fishes; amphibians; reptiles; birds; mammals Craniata , subphylum Craniata , subphylum Vertebrata , Vertebrata
from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants Cretaceous , Cretaceous period
small carnivorous reptiles cynodont
division of the order Therapsida from the Triassic period comprising small carnivorous tetrapod reptiles often with mammal-like teeth Cynodontia , division Cynodontia
genus of reptiles of the family Colubridae including ringneck snakes Diadophis , genus Diadophis
used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria Diapsida , subclass Diapsida
any of numerous extinct terrestrial reptiles of the Mesozoic era dinosaur
periodic shedding of the cuticle in arthropods or the outer skin in reptiles ecdysis , molt , molting , moult , moulting
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