Sclerorhynchoidei

Sclerorhynchoidei is an extinct suborder of sclerorhynchiform rays with saw-like rostrums. They include the orders Sclerorhynchidae and Ptychotrygonidae.[1] They were a rather long-lived group, living from the Cretaceous to the early Eocene, until they became extinct for unknown reasons and were replaced by their close relatives the pristiformes.

Sclerorhynchoidei Temporal range: Cretaceous - Paleogene, 130-55 Ma PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Order:	†Sclerorhynchiformes
Suborder:	†Sclerorhynchoidei Cappetta, 1980
Families
†Sclerorhynchidae †Ptychotrygonidae