Watinoceras

Watinoceras Temporal range: PreЄ Є O S D C P T J K Pg N early Turonian (Cretaceous)
Scientific classification
Class:	Cephalopoda
Subclass:	Ammonoidea
Order:	Ammonitida
Family:	Acanthoceratidae
Subfamily:	Mammitinae
Genus:	Watinoceras Warren, 1930

Watinoceras is an acanthoceratid genus (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.^[1][2]

References

• W.J. Arkell, et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleonotology Pat L Mollusca 4. Geological Society of America and University of Kansas Press.
• W.J. Kennedy, et al., 1999. Lower Turonian (Upper Cretaceous) Watinoceras devonense Zone ammonite fauna in Colorado, USA. USGS Publications Warehouse -Citations View.
• Wutinoceras in Fossilworks

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". https://engineering.purdue.edu/Stratigraphy/gssp/detail.php?periodid=42&top_parentid=35. Geologic Timescale Foundation. External link in |website= (help);