Aspidoceras

Aspidoceras is an extinct ammonoid cephalopod genus that lived during the Late Jurassic (Kimmeridgian) with a fairly broad distribution. Aspidoceras, named by Zittel, 1868, is the type genus for the persphictacian family Aspidoceratidae and subfamily Aspidoceratinae in which it is included. Aspidoceras has an evolute shell with quadrate-rounded or...
Found on http://en.wikipedia.org/wiki/Aspidoceras
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