Rank Genus | ||
Similar Mammites, Collignoniceras, Vascoceras, Calycoceras, Acanthoceras | ||
Watinoceras top 5 facts
Watinoceras is a genus of acanthoceratids (Cephalopoda, Ammonoidea) that lived during the early Turonian stage of the Late Cretaceous.
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 vantrolateral clavi or rounded with ribs passing over in chevrons. Ornament usually becomes coarser with age. Derivation is from Neocardioceras. It (Watinoceras) and Mammites gave rise to the other genera in the subfamily. Some classifications include Watinoceras in the subfamily Acanthoceratinae instead.
Other species include Watinoceras coloradoense, W. reesidei, and W. thompsonense.
The first occurrence of the species Watinoceras devonense marks the beginning of the Turonian.