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Proniceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Olcostephanidae
Formal Genus Name and Reference:
Proniceras BURCKHARDT, 1919, p. 40
Type Species:
Ammonites pronus Oppel, 1865, p. 554, SD ROMAN, 1938, p. 381
Images
(Click to enlarge in a new window)
Fig. 30, 2a, b. *P. pronus Oppel, Poland, lectotype designated herein, X (Zittel, 1868, pl. 15, fig. 8a, b).
Synonyms
Geographic Distribution
southern and central Europe, northern Africa, Madagascar, Iraq, Iran, Pakistan, California, Mexico
Age Range
Beginning Stage in Treatise Usage:
Upper Jurassic (Upper Tithonian)
Beginning International Stage:
Tithonian
Fraction Up In Beginning Stage:
70
Beginning Date:
144.94
Ending Stage in Treatise Usage:
Upper Jurassic (Upper Tithonian)
Ending International Stage:
Tithonian
Fraction Up In Ending Stage:
100
Ending Date:
143.1
Description
Rather small, inner whorls with ribs simple or bifurcating high up side, strongly curved, and without tubercles, later whorls with curved umbilical bullae and simple, biplicate or triplicate ribs, ornament may weaken on body chamber
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Perisphinctaceae
Family:
Olcostephanidae
Formal Genus Name and Reference:
Proniceras BURCKHARDT, 1919, p. 40
Type Species:
Ammonites pronus Oppel, 1865, p. 554, SD ROMAN, 1938, p. 381
Images
(Click to enlarge in a new window)
Fig. 30, 2a, b. *P. pronus Oppel, Poland, lectotype designated herein, X (Zittel, 1868, pl. 15, fig. 8a, b).
Synonyms
Geographic Distribution
southern and central Europe, northern Africa, Madagascar, Iraq, Iran, Pakistan, California, Mexico
Age Range
Beginning Stage in Treatise Usage:
Upper Jurassic (Upper Tithonian)
Beginning International Stage:
Tithonian
Fraction Up In Beginning Stage:
70
Beginning Date:
144.94
Ending Stage in Treatise Usage:
Upper Jurassic (Upper Tithonian)
Ending International Stage:
Tithonian
Fraction Up In Ending Stage:
100
Ending Date:
143.1
Description
Rather small, inner whorls with ribs simple or bifurcating high up side, strongly curved, and without tubercles, later whorls with curved umbilical bullae and simple, biplicate or triplicate ribs, ornament may weaken on body chamber