Platyceras is a genus of extinct Paleozoic sea snails, marine gastropod mollusks in the family Platyceratidae. This genus is known from the Ordovician to the Permian periods. It is the type genus of the family Platyceratidae. == Description == Platyceras has distinctive shape that is easily recognized. The cap-like shell is high and broad anterior...
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http://en.wikipedia.org/wiki/Platyceras
genus of extinct gastropods (snails) that occurs as fossils in rocks of Silurian to Permian age (438 to 245 million years ago). Its distinctive ...
Found on
http://www.britannica.com/eb/a-z/p/78
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