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Deltodus primus Shark Tooth in matrix a.jpg

Dpaul7

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Deltodus primus Shark Tooth in matrix
 
Chesterian Zone of the Bangor Limestone Formation in northern Alabama
TIME PERIOD: Mississippian Period (ca 325,000,000 yrs old)
The Cochliodontiformes are an extinct group of cartilaginous fish, which is mainly known through fossil and tooth plate finds and occurred from the Upper Carboniferous to the Upper Permian. Externally, the fish looked like skinned, flattened transitional forms between primitive sharks and today's sea cats (Chimaeriformes). Upper and lower jaws were each occupied in each half with a long, spirally curved tooth plate. In front of it were possibly even smaller teeth. The tooth plates were very similar to those of Jurassic sea cats. Transverse lines on the dental plates suggest that they originated from the merging of several individual teeth. The Cochliodontiformes are close relatives of the sea cats are considered their sister group. Similar to the sea cats the upper jaw (the Palatoquadratum) is completely merged with the Neurocranium ("brain skull"), a state of the Holostylie is called ("holocephal" = skull from a piece).
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: †Cochliodontiformes
Family: †Cochliodontidae
Genus: †Deltodus
Species: †primus

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