Watinoceras is a genus of acanthoceratid ammonite that lived during the early Turonian stage of the Late Cretaceous.
Watinoceras Temporal range: Turonian
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Watinoceras coloradoense | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | Cephalopoda |
Subclass: | †Ammonoidea |
Order: | †Ammonitida |
Family: | †Acanthoceratidae |
Subfamily: | †Acanthoceratinae |
Genus: | †WatinocerasWarren, 1930
Species
W. amudariense Arkhanguelsky 1916
W. coloradoense Henderson 1908
W. jaekeli Solger 1904
W. reesidei Warren 1930
W. thompsonense Cobban 1988
Description
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Early whorls are compressed, finely ribbed with inner and outer ventrolateral and siphonal tubercles as in Neocardioceras, but siphonal row is soon lost. Later the venter may be concave between rows of ventrolateral clavi or rounded with ribs passing over in chevrons. Ornament usually becomes coarser with age. Derivation is from Neocardioceras, Watinoceras and Mammites gave rise to the other genera in the subfamily Acanthoceratinae. Older classifications included Watinoceras in the subfamily Mammitinae instead. Species include W. coloradoense, W. reesidei, and W. thompsonense. Biostratigraphic significance editThe first occurrence of the species Watinoceras devonense marks the beginning of the Turonian.[1][2] Distribution editFossils of the genus have been found in:[3]
References edit
Further reading edit
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