About: Ptychodus   Sponge Permalink

An Entity of Type : owl:Thing, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

The genus Ptychodus is represented in the fossil records of Asia, Europe, Africa and the Americas. In North America, they are generously represented in Texas and the Western Interior Seaway. Welton &: Farish (1993) ascribed ten species to the Cretaceous of Texas: In addition to some of the above, the Kansas chalk also yields Ptychodus martini WILLISTON 1898 from Coniacian exposures.

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  • Ptychodus
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  • The genus Ptychodus is represented in the fossil records of Asia, Europe, Africa and the Americas. In North America, they are generously represented in Texas and the Western Interior Seaway. Welton &: Farish (1993) ascribed ten species to the Cretaceous of Texas: In addition to some of the above, the Kansas chalk also yields Ptychodus martini WILLISTON 1898 from Coniacian exposures.
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  • The genus Ptychodus is represented in the fossil records of Asia, Europe, Africa and the Americas. In North America, they are generously represented in Texas and the Western Interior Seaway. Welton &: Farish (1993) ascribed ten species to the Cretaceous of Texas: * Ptychodus anonymus WILLISTON 1900 (Cenomanian-Turonian) * Ptychodus connellyi MACLEOD & LAUGHTER 1980 (Campanian) * Ptychodus decurrens AGASSIZ 1843 (Albian-Cenomanian) * Ptychodus latissimus AGASSIZ 1843 (Coniacian-Campanian) * Ptychodus mammillaris AGASSIZ 1835 (Coniacian) * Ptychodus mortoni AGASSIZ 1839 ( Coniacian-Santonian) * Ptychodus occidentalis LEIDY 1868 (Cenomanian-Turonian) * Ptychodus polygyrus AGASSIZ 1839 (Turonian) * Ptychodus rugosus DIXON 1850 (Santonian) * Ptychodus whipplei MARCOU 1858 (Turonian-Coniacian) In addition to some of the above, the Kansas chalk also yields Ptychodus martini WILLISTON 1898 from Coniacian exposures. Ever since they were first described in the mid 1880's, Ptychodid sharks have been a puzzle, and it is still uncertain whether they are more closely related to sharks or rays. Generally, they are known only from isolated teeth in late Cretaceous (Albian through Campanian) deposits. Several more or less complete jaw plates, consisting of a hundred or more teeth, have also been found. In a few cases, the teeth are associated with vertebrae and dermal scales that are very similar to those of. The current view of the family Ptychodontidae is that they are related to hybodont sharks.
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