Earth Sciences 2266F/G Lecture Notes - Lecture 14: Skull, Diapsid, Carboniferous
26 Jul 2016
School
Department
Course
Professor
Document Summary
Reptiles is also a paraphyletic group even bigger paraphyletic group than amphibians. Even modern reptiles don"t form a monophyletic group. Crocodiles are more related to dinosaurs and birds than other reptiles. So reptilia is not only a paraphyletic group, it"s also a polyphyletic group (convergent) One group of early amniotes (or early reptiles ), a synapsid, eventually evolved into mammals in one group (synapsida) and one group evolved into dinosaurs/birds (diapsida evolving to modern reptiles) Egg is a complex structure, giving the ability to live completely independent of water; eventually can conquer desert environments. Albumin and egg white and yolk; inside is the embryo. After egg is laid, shell is very porous so oxygen diffuses in for embryo to use. Co2 will also come out at a slow rate, proving metabolism. Dinosaur eggs are very prominent (within china they"re very common)
