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Phylloceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Phyllocerataceae
Family:
Phylloceratidae
Formal Genus Name and Reference:
Phylloceras SUESS, 1865
Type Species:
Am. heterophyllus J. SOWERBY, 1820
Images
(Click to enlarge in a new window)
Fig. 218,5. *P. heterophyllum (Sow.), L.Jur.(Toarc.), Eng., 5 a, b, X0.2(583 *)
Synonyms
Rhacoceras, Xeinophylloceras, Heterophylloceras
Geographic Distribution
world-wide
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Sinem.) - based on older Treatise version
Beginning International Stage:
Sinemurian
Fraction Up In Beginning Stage:
0
Beginning Date:
199.46
Ending Stage in Treatise Usage:
L.Jur. (Sinem.)-Lower Cretaceous (Barremian); but now to Maastrictian for P. (Partschiceras) now included in this genus
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Involute, compressed forms with gentle umbilical slope, dense, fine radial lirae on test but not on internal mold, and some more or less vague radial folds on whorl sides. Sutures with triphyllic saddles.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Phyllocerataceae
Family:
Phylloceratidae
Formal Genus Name and Reference:
Phylloceras SUESS, 1865
Type Species:
Am. heterophyllus J. SOWERBY, 1820
Images
(Click to enlarge in a new window)
Fig. 218,5. *P. heterophyllum (Sow.), L.Jur.(Toarc.), Eng., 5 a, b, X0.2(583 *)
Synonyms
Rhacoceras, Xeinophylloceras, Heterophylloceras
Geographic Distribution
world-wide
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Sinem.) - based on older Treatise version
Beginning International Stage:
Sinemurian
Fraction Up In Beginning Stage:
0
Beginning Date:
199.46
Ending Stage in Treatise Usage:
L.Jur. (Sinem.)-Lower Cretaceous (Barremian); but now to Maastrictian for P. (Partschiceras) now included in this genus
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Involute, compressed forms with gentle umbilical slope, dense, fine radial lirae on test but not on internal mold, and some more or less vague radial folds on whorl sides. Sutures with triphyllic saddles.