Listracanthus sp.

Listracanthus is known from isolated scales and patches of skin found in Upper Mississippian and Pennsylvanian marine deposits. It is a chondrichthyan, but otherwise it is unknown. This shark got very large; the picture is of a single scale. These scales stood up on the back of the shark, while coarse button-like scales (Petrodus) lay more ventrally.

Reference:

• Newberry, J.S.  and A.H.  Worthen, 1870.  Descriptions of fossil vertebrates.  Geological Survey of Illinois 4:347-374.

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