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Eumorphoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Dimorphoceratoidea
Family:
Girtyoceratidae
Formal Genus Name and Reference:
Eumorphoceras GIRTY, 1909, p. 67
Type Species:
E. bisulcatum GIRTY, 1909, p. 68, OD
Images
(Click to enlarge in a new window)
Fig. 27, 3a-f. * E. bisulcatum, Caney Shale, Sandy Creek, Johnson County, Oklahoma, USA, upper Chesterian, a-b, holotype, USNM 119596, X 3 (Gordon, 1965), c-d, Leslie, Searcy County, Arkansas, USA, upper Chesterian, SUI 11523, X 2, e, suture, X 0.4, f, cross section, X 1.2 (McCaleb, Quinn, & Furnish, 1964)."
Synonyms
Medioloboceras
Geographic Distribution
Belgium, Great Britain, Ireland, Germany, Poland, Russia (Novaia Zemlia, South Urals), Kazakhstan (South Urals), Spain, Algeria, China (Gansu, Guangxi), Tajikistan, Uzbekistan, USA (Arkansas, California, Nevada, Oklahoma, Texas, Utah)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (Serpukhovian)
Beginning International Stage:
Serpukhovian
Fraction Up In Beginning Stage:
0
Beginning Date:
330.34
Ending Stage in Treatise Usage:
Mississippian (Serpukhovian)
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Conch form similar to Girtyoceras, but acute venter appearing at a late stage, ventrolateral grooves always present. Strong ribs beginning usually at second whorl, late stage smooth, no spiral ornamentation.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Goniatitida
Superfamily:
Dimorphoceratoidea
Family:
Girtyoceratidae
Formal Genus Name and Reference:
Eumorphoceras GIRTY, 1909, p. 67
Type Species:
E. bisulcatum GIRTY, 1909, p. 68, OD
Images
(Click to enlarge in a new window)
Fig. 27, 3a-f. * E. bisulcatum, Caney Shale, Sandy Creek, Johnson County, Oklahoma, USA, upper Chesterian, a-b, holotype, USNM 119596, X 3 (Gordon, 1965), c-d, Leslie, Searcy County, Arkansas, USA, upper Chesterian, SUI 11523, X 2, e, suture, X 0.4, f, cross section, X 1.2 (McCaleb, Quinn, & Furnish, 1964)."
Synonyms
Medioloboceras
Geographic Distribution
Belgium, Great Britain, Ireland, Germany, Poland, Russia (Novaia Zemlia, South Urals), Kazakhstan (South Urals), Spain, Algeria, China (Gansu, Guangxi), Tajikistan, Uzbekistan, USA (Arkansas, California, Nevada, Oklahoma, Texas, Utah)
Age Range
Beginning Stage in Treatise Usage:
Mississippian (Serpukhovian)
Beginning International Stage:
Serpukhovian
Fraction Up In Beginning Stage:
0
Beginning Date:
330.34
Ending Stage in Treatise Usage:
Mississippian (Serpukhovian)
Ending International Stage:
Serpukhovian
Fraction Up In Ending Stage:
100
Ending Date:
323.4
Description
Conch form similar to Girtyoceras, but acute venter appearing at a late stage, ventrolateral grooves always present. Strong ribs beginning usually at second whorl, late stage smooth, no spiral ornamentation.