The Climatiiformes is an order of extinct fish belonging to the class Acanthodii. Like most other `spiny sharks`, the Climatiiformes had sharp spines. These animals were rather small in size (about 4 in or 10 cm) and lived from the Late Silurian to the Early Carboniferous period. The type genus is Climatius. The order splits into the suborders C.....
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http://en.wikipedia.org/wiki/Climatiiformes
(from the article `fish`) ...Active, free-swimming fishes with large eyes placed laterally. Small species probably freshwater, some larger species may have gone to sea.†Order ...
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http://www.britannica.com/eb/a-z/c/97
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