Watinoceras

Watinoceras is a genus of acanthoceratid ammonite that lived during the early Turonian stage of the Late Cretaceous.

Not to be confused with Wutinoceras.

Watinoceras
Temporal range: Turonian
~93.9–89.6 Ma
↓
W. coloradoense
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Acanthoceratidae
Subfamily: †Acanthoceratinae
Genus: †Watinoceras
Warren, 1930
Species
  • W. amudariense Arkhanguelsky 1916
  • W. coloradoense Henderson 1908
  • W. jaekeli Solger 1904
  • W. reesidei Warren 1930
  • W. thompsonense Cobban 1988

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. Older classifications included Watinoceras in the subfamily Mammitinae instead.

Species include Watinoceras coloradoense, W. reesidei, and W. thompsonense.

Biostratigraphic significance

The first occurrence of the species Watinoceras devonense marks the beginning of the Turonian.[1][2]

Distribution

Fossils of the genus have been found in:[3]

References
  1. Kennedy, W. J.; I. Walaszczyk; W. A. Cobban (2005). "The Global Boundary Stratotype Section and Point for the base of the Turonian Stage of the Cretaceous: Pueblo, Colorado, U.S.A." (PDF). Episodes. 28 (2): 93–104. Retrieved 16 September 2012.
  2. "GSSP for Turonian Stage". Geologic Timescale Foundation. Retrieved 7 August 2014.
  3. Watinoceras at Fossilworks.org

Further reading
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