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Imitoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Tornoceratina
Superfamily:
Prionoceratoidea
Family:
Prionoceratidae
Formal Genus Name and Reference:
Imitoceras SCHINDEWOLF, 1923, p. 325
Type Species:
Ammonites rotatorius de Koninck, 1844, p. 565, SD Schindewolf, 1926b, p. 70, Goniatites ixion Hall, 1860, p. 125 (see SCHINDEWOLF, 1923, p. 326)
Images
(Click to enlarge in a new window)
Fig. 1, 2a-d. *I. aff. rotatorium (DE Koninck), Rockford, Jackson County, Indiana, Rockford limestone, Osagean, a-c, X 0.9, d, suture, X 0.8 (Miller, Furnish, & Schindewolf, 1957)."
Synonyms
Geographic Distribution
Belgium, Germany, Austria, Algeria, Russia, China (Xizang, Yunnan), Australia (West Australia), Canada (Alberta, British Columbia), USA (Arkansas, Iowa, Illinois, Indiana, Michigan, Ohio, Kentucky, Montana, ?New Mexico, Nevada)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (middle Tournaisian-upper Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
33
Beginning Date:
355.15
Ending Stage in Treatise Usage:
Mississippian (middle Tournaisian-upper Tournaisian)
Ending International Stage:
Tournaisian
Fraction Up In Ending Stage:
100
Ending Date:
346.73
Description
Conch form discoidal to globular, Young stages with narrow umbilicus, adult shell form usually with relatively high aperture and very narrow or punctiform umbilicus, Growth lines usually fine, linear, rarely coarse, Constrictions may be present, Ventral lobe narrow, more or less parallel sided or slightly pouched, adventitious lobe asymmetric
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Subclass:
Ammonoidea
Order:
Goniatitida
Suborder:
Tornoceratina
Superfamily:
Prionoceratoidea
Family:
Prionoceratidae
Formal Genus Name and Reference:
Imitoceras SCHINDEWOLF, 1923, p. 325
Type Species:
Ammonites rotatorius de Koninck, 1844, p. 565, SD Schindewolf, 1926b, p. 70, Goniatites ixion Hall, 1860, p. 125 (see SCHINDEWOLF, 1923, p. 326)
Images
(Click to enlarge in a new window)
Fig. 1, 2a-d. *I. aff. rotatorium (DE Koninck), Rockford, Jackson County, Indiana, Rockford limestone, Osagean, a-c, X 0.9, d, suture, X 0.8 (Miller, Furnish, & Schindewolf, 1957)."
Synonyms
Geographic Distribution
Belgium, Germany, Austria, Algeria, Russia, China (Xizang, Yunnan), Australia (West Australia), Canada (Alberta, British Columbia), USA (Arkansas, Iowa, Illinois, Indiana, Michigan, Ohio, Kentucky, Montana, ?New Mexico, Nevada)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (middle Tournaisian-upper Tournaisian)
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
33
Beginning Date:
355.15
Ending Stage in Treatise Usage:
Mississippian (middle Tournaisian-upper Tournaisian)
Ending International Stage:
Tournaisian
Fraction Up In Ending Stage:
100
Ending Date:
346.73
Description
Conch form discoidal to globular, Young stages with narrow umbilicus, adult shell form usually with relatively high aperture and very narrow or punctiform umbilicus, Growth lines usually fine, linear, rarely coarse, Constrictions may be present, Ventral lobe narrow, more or less parallel sided or slightly pouched, adventitious lobe asymmetric