Long time first subclass (archosauria)
This subclass is progress holes classes. Accounting systems on Earth Mesozoic reptiles position are included in this subclass in. As reptiles of the Mesozoic era or the age of dinosaurs, in a sense refers to the subclass members in a variety of great said. This subclass includes five projects, respectively, are outlined below:
1 thecodonts head (thecodontia)
2 crocodile head (crocodilia)
Existing crocodile alligators is the true progress on behalf of sub-goal. The evolution of crocodiles from the Late Triassic protosuchus (original crocodile), after the Jurassic and Cretaceous of the crocodiles, evolved in the Late Cretaceous the purpose of the existing sub-groups of genuine crocodile.
3 pterosaur head (pterosauria)
dsungaripterus young (Junggar pterosaurs) which is found in the upper part of the Lower Cretaceous of Xinjiang Urho full dragon fossils. The body, two wings stretch up to 3.5m. Body length of about 0.9m. Skull long, narrow and sharp front. Skull on the edge of development. Connectivity into big holes with eyelets nostrils. Palate with a 14-15 tooth, jaw has 11-12 teeth, but no jaw front teeth. Fourth carpal bone and the fourth phalanx expertise.
Pterosaurs survival time is very short end of the Cretaceous extinction, which may be because of the emergence of the "modernization" of birds, are marginalized, unable to warm-blooded birds and flexible competition rules.
4,5 lizard hip head (saurischia), Ornithischia (ornithischia) are dinosaurs class (dinosauria), the dominant Mesozoic reptiles. |
Ornithischia