Watinoceras

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

Watinoceras
Temporal range: early Turonian (Cretaceous)
Watinoceras coloradoense MNHN.F.J07836 side.jpg
W. coloradoense
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Family: Acanthoceratidae
Subfamily: Acanthoceratinae
Genus: Watinoceras
Warren, 1930
Species
  • See text

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.

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

ReferencesEdit

  • W.J. Arkell et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology 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. [1]
  • Watinoceras 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". Geologic Timescale Foundation. Retrieved 7 August 2014.