Coelacanthus (`Hollow Spine`) is a genus of extinct coelacanths that first appeared during the Permian period. In fact, this was the first genus of coelacanths ever described, as the order Coelacanthiformes is named after it. They bear a superficial similarity to the living Latimeria, though they were smaller, and had more elongated heads. Indiv.....
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http://en.wikipedia.org/wiki/Coelacanthus
(from the article `coelacanth`) Coelacanths appeared about 350 million years ago and were abundant over much of the world; the genus Coelacanthus has been found as fossils in rocks ...
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http://www.britannica.com/eb/a-z/c/105
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