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Fossils from Monmouth County, New Jersey

Skates and Rays (Chondrichthyes)

The Skates and Rays are cartilaginous fish, just like sharks. They differ in that they have much more flattened bodies and have enlarged pectoral fins. They are well-suited for living and feeding near the sea floor. Skates primarily feed on fish, while rays prefer to feed on various invertebrates, such as crustaceans and mollusks.

Skates and rays shed their teeth just like sharks. There is much less variation to be found among the skates and rays than among the sharks. It is still possible to find pathological teeth and teeth with in vivo wear (it is in fact very usual on ray teeth). Digested teeth and underdeveloped teeth aren’t findable. It is, however, possible to find ray teeth that are fossilized during a file split. When rays grow, they can develop more tooth files and sometimes teeth will be still joined together at the crown but have two roots. This is not a common find and I haven’t seen any from NJ. Some sharks actually do the same thing, but very few shark species do; none of the New Jersey shark species have file splitting (information from “Al Dente” on TheFossilForum).

Sawfish

(Ischyrhiza mira)

Cow-Nosed Ray

(Brachyrhizodus wichitaensis)

Sawfish

(Ischyrhiza avonicola)

Guitarfish

(Pseudohypolophus mcnultyi)

Sawfish

(Ptychotrygon sp.)

Guitarfish

(Rhinobatos casieri)

Cow-Nosed Ray

(Rhombodus laevis)

Miscellaneous

Cartilage

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