Notes on rostral teeth of ganopristine sawfishes, with special reference to Texas material

Bulk washing of marine sediments of the Gulf Coastal Plain, varying in age from Albian to Montian, has resulted in the recovery of rostral teeth of three genera of ganopristine sawfishes. The sample contains teeth of Sclerorhyncus, a genus not before reported from America. The collection is believed to demonstrate evolution within two genera: (1) Teeth referred to Onchopristis dunklei from Albian deposits have fewer barbs along their posterior edge than otherwise identical teeth from Cenomanian deposits of Texas. (2) There is a gross enlargement of the pulp cavity and decrease in the amount of osteodentine in the bases of Ischyrhiza mira teeth from Turonian to Santonian. Certain species have geologic ranges which do not overlap and may prove to be useful in zonation.

This record provided courtesy of AGI/GeoRef.

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