Anthracosauria

Anthracosauria is an order of extinct reptile-like amphibians that flourished during the Carboniferous and early Permian periods, although precisely which species are included depends on one`s definition of the taxon. ==Various definitions== As originally defined by Säve-Söderbergh in 1934, the anthracosaurs are a group of usually large aquatic....
Found on http://en.wikipedia.org/wiki/Anthracosauria

Anthracosauria

(from the article `amphibian`) ...and Lepospondyli—are traditionally distinguished based on the arch vertebrae in the former and the husk vertebrae in the latter. The ...
Found on http://www.britannica.com/eb/a-z/a/81
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