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Hysteroceras
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Brancoceratidae
Formal Genus Name and Reference:
Hysteroceras HYATT, 1900, p. 590
Type Species:
Ammonites varicosus J. de C. SOWERBY, 1824, p. 74, OD
Images
(Click to enlarge in a new window)
Fig. 104, 3a-c. *H. varicosum (J. de C. Sowerby), Upper Albian, England, a, b, X 1, c, X 2.5 (Spath, 1923-1943). Fig. 104, 3d, e. H. antipodeum (Etheridge), Upper Albian, Australia (Northern Territory), X 1.5 (R. Etheridge, Jr., 1902).
Synonyms
Spathiceras, Terascoceras, Komeceras, Askoloboceras, Petinoceras
Geographic Distribution
Europe, Australia (Northern Territory), Africa, Madagascar, Iran, Pakistan, Mexico, Venezuela, Curaçao, Greenland
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Keel commonly persisting to the ribbed stage, ribs branching or long and short, with umbilical and in some forms blunt ventrolateral tubercles, ribbing varies from sharp and high to broad and flat, but subdivision on this basis is not justified
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Acanthocerataceae
Family:
Brancoceratidae
Formal Genus Name and Reference:
Hysteroceras HYATT, 1900, p. 590
Type Species:
Ammonites varicosus J. de C. SOWERBY, 1824, p. 74, OD
Images
(Click to enlarge in a new window)
Fig. 104, 3a-c. *H. varicosum (J. de C. Sowerby), Upper Albian, England, a, b, X 1, c, X 2.5 (Spath, 1923-1943). Fig. 104, 3d, e. H. antipodeum (Etheridge), Upper Albian, Australia (Northern Territory), X 1.5 (R. Etheridge, Jr., 1902).
Synonyms
Spathiceras, Terascoceras, Komeceras, Askoloboceras, Petinoceras
Geographic Distribution
Europe, Australia (Northern Territory), Africa, Madagascar, Iran, Pakistan, Mexico, Venezuela, Curaçao, Greenland
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Middle Albian)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
25
Beginning Date:
110.03
Ending Stage in Treatise Usage:
Lower Cretaceous (Upper Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
100
Ending Date:
100.5
Description
Keel commonly persisting to the ribbed stage, ribs branching or long and short, with umbilical and in some forms blunt ventrolateral tubercles, ribbing varies from sharp and high to broad and flat, but subdivision on this basis is not justified