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Barremites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Desmoceratidae
Formal Genus Name and Reference:
Barremites KILIAN, 1913, p. 333
Type Species:
*Ammonites difficilis ORBIGNY , 1841, p. 135; M
Images
(Click to enlarge in a new window)
Fig. 50, 1a, b. *B. difficilis (Orbigny), Barremian, France, X 0.75 (Orbigny, 1840-1842)., Fig. 50, 1c, d. B. raspaili KILIAN, Barremian, France, X0.75 (Orbigny, 1840-1842)., Fig. 50, le, f. B. chaputi Dimitrova, Barremian, France, X (Chaput, 1921).
Synonyms
Miodesmoceras; Raspailiceras; Nabdalsiceras; Falloticeras; Cassidoiceras
Geographic Distribution
Europe, northern Africa, Japan, Mexico, Colombia
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Hauterivian)
Beginning International Stage:
Hauterivian
Fraction Up In Beginning Stage:
45
Beginning Date:
129.86
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
100
Ending Date:
121.4
Description
Moderately to very involute; fairly inflated, with rounded umbilical margin, to very compressed, with sharp umbilical margin; constrictions straight, sinuous, or slightly falcate on internal molds, forming collars on shell; with intermediate, feeble lirae to moderately distinct ribs. The variable Barremian populations have been much split by authors, but there seems to be no significant morphological gap between supposed genera.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Desmocerataceae
Family:
Desmoceratidae
Formal Genus Name and Reference:
Barremites KILIAN, 1913, p. 333
Type Species:
*Ammonites difficilis ORBIGNY , 1841, p. 135; M
Images
(Click to enlarge in a new window)
Fig. 50, 1a, b. *B. difficilis (Orbigny), Barremian, France, X 0.75 (Orbigny, 1840-1842)., Fig. 50, 1c, d. B. raspaili KILIAN, Barremian, France, X0.75 (Orbigny, 1840-1842)., Fig. 50, le, f. B. chaputi Dimitrova, Barremian, France, X (Chaput, 1921).
Synonyms
Miodesmoceras; Raspailiceras; Nabdalsiceras; Falloticeras; Cassidoiceras
Geographic Distribution
Europe, northern Africa, Japan, Mexico, Colombia
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Hauterivian)
Beginning International Stage:
Hauterivian
Fraction Up In Beginning Stage:
45
Beginning Date:
129.86
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Barremian)
Ending International Stage:
Barremian
Fraction Up In Ending Stage:
100
Ending Date:
121.4
Description
Moderately to very involute; fairly inflated, with rounded umbilical margin, to very compressed, with sharp umbilical margin; constrictions straight, sinuous, or slightly falcate on internal molds, forming collars on shell; with intermediate, feeble lirae to moderately distinct ribs. The variable Barremian populations have been much split by authors, but there seems to be no significant morphological gap between supposed genera.