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Thurmanniceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Neocomitidae
Formal Genus Name and Reference:
Thurmanniceras COSSMANN, 1901, p. 58
Type Species:
Ammonites thurmanni Pictet & CAMPICHE, 1860, p. 250, OD
Images
(Click to enlarge in a new window)
FIG. 41,1a–c. *T. (T.) thurmanni (P ICTET & C AMPICHE ), Lower Valanginian, France; × 1 (Sayn, 1907a).
Synonyms
Thurmannites
Geographic Distribution
southern and central Europe, Morocco, Madagascar, Pakistan, Himalayas, Sumatra, California, Mexico, Peru, Argentina
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Berriasian)
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
50
Beginning Date:
140.4
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Valanginian)
Ending International Stage:
Valanginian
Fraction Up In Ending Stage:
100
Ending Date:
132.6
Description
Compressed, rather evolute; venter flat on early and rounded on later whorls; ribs arising singly or in twos from slight umbilical bullae; ribs feeble to strong, gently flexuous to falcoid, irregularly branched near midside or simple with intercalatories, with small, transverse ventrolateral bullae, interrupted or not on venter; commonly with strong constrictions; ornament tending to weaken at midflank near aperture. Most described forms are microconchs with long lappets.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Neocomitidae
Formal Genus Name and Reference:
Thurmanniceras COSSMANN, 1901, p. 58
Type Species:
Ammonites thurmanni Pictet & CAMPICHE, 1860, p. 250, OD
Images
(Click to enlarge in a new window)
FIG. 41,1a–c. *T. (T.) thurmanni (P ICTET & C AMPICHE ), Lower Valanginian, France; × 1 (Sayn, 1907a).
Synonyms
Thurmannites
Geographic Distribution
southern and central Europe, Morocco, Madagascar, Pakistan, Himalayas, Sumatra, California, Mexico, Peru, Argentina
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Berriasian)
Beginning International Stage:
Berriasian
Fraction Up In Beginning Stage:
50
Beginning Date:
140.4
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Valanginian)
Ending International Stage:
Valanginian
Fraction Up In Ending Stage:
100
Ending Date:
132.6
Description
Compressed, rather evolute; venter flat on early and rounded on later whorls; ribs arising singly or in twos from slight umbilical bullae; ribs feeble to strong, gently flexuous to falcoid, irregularly branched near midside or simple with intercalatories, with small, transverse ventrolateral bullae, interrupted or not on venter; commonly with strong constrictions; ornament tending to weaken at midflank near aperture. Most described forms are microconchs with long lappets.