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Oxytropidoceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Brancoceratidae
Formal Genus Name and Reference:
Oxytropidoceras STIELER, 1920, p. 346
Type Species:
Ammonites roissyanus ORBIGNY, 1841, p. 302, OD
Images
(Click to enlarge in a new window)
FIG. 106,2a–c. *O. (O.) roissyanum (ORBIGNY), France; a,b, ×0.75; c, enlarged (Orbigny, 1840–1842).——F IG . 106,2d,e. O. (O.) manuanense (S PATH ), Zululand; ×1 (Spath, 1921a).
Synonyms
Pseudophacoceras
Geographic Distribution
Europe, Morocco, Angola, South Africa (Zululand), Madagascar, Pakistan, California, Texas, Peru, Colombia, Venezuela, Brazil, Mexico
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
0
Beginning Date:
113.2
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Moderately to very compressed and high-whorled, with high keel, ribs single to branching, narrow and high, rounded or flat, with or without tubercles, keel may appear well before ribs, ribs may be effaced later. Suture generally with oblique outer slope on first lateral saddle.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Brancoceratidae
Formal Genus Name and Reference:
Oxytropidoceras STIELER, 1920, p. 346
Type Species:
Ammonites roissyanus ORBIGNY, 1841, p. 302, OD
Images
(Click to enlarge in a new window)
FIG. 106,2a–c. *O. (O.) roissyanum (ORBIGNY), France; a,b, ×0.75; c, enlarged (Orbigny, 1840–1842).——F IG . 106,2d,e. O. (O.) manuanense (S PATH ), Zululand; ×1 (Spath, 1921a).
Synonyms
Pseudophacoceras
Geographic Distribution
Europe, Morocco, Angola, South Africa (Zululand), Madagascar, Pakistan, California, Texas, Peru, Colombia, Venezuela, Brazil, Mexico
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Lower Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
0
Beginning Date:
113.2
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Moderately to very compressed and high-whorled, with high keel, ribs single to branching, narrow and high, rounded or flat, with or without tubercles, keel may appear well before ribs, ribs may be effaced later. Suture generally with oblique outer slope on first lateral saddle.