Thalattosaurs were a group of marine reptiles
that lived in the mid and late
It is not entirely clear which other groups they were related to,
although shared ancestors with
Thalattosaurs tended to outwardly resemble lizards (but to which they are not
believed to be closely related), and had a long flattened tail that would
have held them to swim. The largest Thalattosaurs were about 13 feet (4 meters)
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