Reptiles 2
Reptiles are vertebrate, or backboned animals constituting the class
Reptilia and are characterized by a combination of features, none of
which alone could separate all reptiles from all other animals.
The characteristics of reptiles are numerous, therefore can not be
explained in great detail in this report. In no special order, the
characteristics of reptiles are: cold-bloodedness; the presence of
lungs; direct development, without larval forms as in amphibians; a dry
skin with scales but …
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…Cotylosauria, which evolved from an amphibian
labyrinthodont stock. It is also quite clear that the coty losaurs early
divided into two lines, one of which (the pelycosaurs) represented the
stock that gave rise to the mammals. Another branch led to all of the
other reptiles, and later, to the birds as well. Thus, most of the
questions of reptilian evolution and classification deal with the
reptiles' interrelationship, rather than with their relationships with
other animals.
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