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Euomphaloceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Euomphaloceras SPATH, 1923b, p. 143
Type Species:
Ammonites euomphalus SHARPE, 1855, p. 31, OD
Images
(Click to enlarge in a new window)
Fig. 126, 1a-c. *E. euomphalum (Sharpe), England, X 1 (Crick, 1899), ——FIG. 126, 1d, e. E. septemseriatum (Cragin), Texas, X 0.5 (Moreman, 1942)
Synonyms
Kanabiceras; Scaphites? Septemseriatus; Burroceras
Geographic Distribution
western Europe, northern Africa, Angola, Madagascar, Syria, southern India, Japan, USA (Western Interior, California), Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cenomanian
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
75
Beginning Date:
95.55
Ending Stage in Treatise Usage:
Upper Cenomanian
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Very evolute, whorl section square to depressed-octagonal, prominent umbilical and ventrolateral tubercles on some or all main ribs, ribs branching at ventrolateral tubercles and carrying 3 rows of small, bullate to clavate tubercles on broad venter, shallow ventral constrictions on early whorls, variously persistent, ribs may be transverse or in chevrons on venter
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Acanthoceratidae
Formal Genus Name and Reference:
Euomphaloceras SPATH, 1923b, p. 143
Type Species:
Ammonites euomphalus SHARPE, 1855, p. 31, OD
Images
(Click to enlarge in a new window)
Fig. 126, 1a-c. *E. euomphalum (Sharpe), England, X 1 (Crick, 1899), ——FIG. 126, 1d, e. E. septemseriatum (Cragin), Texas, X 0.5 (Moreman, 1942)
Synonyms
Kanabiceras; Scaphites? Septemseriatus; Burroceras
Geographic Distribution
western Europe, northern Africa, Angola, Madagascar, Syria, southern India, Japan, USA (Western Interior, California), Brazil
Age Range
Beginning Stage in Treatise Usage:
Upper Cenomanian
Beginning International Stage:
Cenomanian
Fraction Up In Beginning Stage:
75
Beginning Date:
95.55
Ending Stage in Treatise Usage:
Upper Cenomanian
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Very evolute, whorl section square to depressed-octagonal, prominent umbilical and ventrolateral tubercles on some or all main ribs, ribs branching at ventrolateral tubercles and carrying 3 rows of small, bullate to clavate tubercles on broad venter, shallow ventral constrictions on early whorls, variously persistent, ribs may be transverse or in chevrons on venter