Polyrhizodus digitatus

There is only one Bear Gulch Polyrhizodus jaw, and it has tooth families. This is the only articulated dentition known of this common Upper Mississippian petalodont. The dentition is homodont. Many species were named on the basis of isolated Lower Carboniferous Polyrhizodus teeth. The variations among many of these species are seen in this single dentition, thus reducing those tooth species names to synonyms of the oldest name, P. digitatus.  The scale bar is 1 cm.

Reference:

• Lund, R. 1983. "On a dentition of Polyrhizodus (Chondrichthyes, Petalodontiformes) from the Bear Gulch Limestone." J. Vert. Paleo. 3:1-6.

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