reptile
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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