Genus of molluscs (fossil)
Watinoceras is a genus of acanthoceratid ammonite that lived during the early Turonian stage of the Late Cretaceous.
Description.
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.
The first occurrence of the species "Watinoceras devonense" marks the beginning of the Turonian.
Distribution.
Fossils of the genus have been found in:
References.
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