Pterothecidae

Pterothecidae is an extinct family of Paleozoic molluscs of uncertain position, either Gastropoda or Monoplacophora, with isostrophically coiled shells. == Taxonomy == The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 categorizes Pterothecidae in the superfamilia Bellerophontoidea within the Paleozoic molluscs of uncertain systematic positi...
Found on http://en.wikipedia.org/wiki/Pterothecidae
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