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Hypacanthoplites
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Deshayesitaceae
Family:
Parahoplitidae
Formal Genus Name and Reference:
Hypacanthoplites SPATH, 1923d, p. 64
Type Species:
Acanthoceras milletianum (Orbigny) var. plesiotypica FRITEL, 1906, p. 245, OD
Images
(Click to enlarge in a new window)
Fig. 215, 4a-c. *H. plesiotypicus (Fritel), Germany, a, b, X 1, c, X 2 (Collet, 1907).
Synonyms
Geographic Distribution
Europe, northern Africa, Madagascar, Iran, California, Texas
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Lower Cretaceous (Lower Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
25
Ending Date:
110.03
Description
Up to 400 mm in diameter, whorl section depressed in initial stage and sometimes in later stages, early whorls hexagonal or rectangular in section, with flat or concave venter and angular shoulders, primary ribs straight or flexuous, tuberculate at umbilical margin, and branching at lateral tubercle, secondary ribs intercalated or branching, all ribs nodose on shoulders, later tubercles disappearing and venter becoming rounded, test thickened on crest of ribs
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Cephalopoda
Order:
Ammonitida
Superfamily:
Deshayesitaceae
Family:
Parahoplitidae
Formal Genus Name and Reference:
Hypacanthoplites SPATH, 1923d, p. 64
Type Species:
Acanthoceras milletianum (Orbigny) var. plesiotypica FRITEL, 1906, p. 245, OD
Images
(Click to enlarge in a new window)
Fig. 215, 4a-c. *H. plesiotypicus (Fritel), Germany, a, b, X 1, c, X 2 (Collet, 1907).
Synonyms
Geographic Distribution
Europe, northern Africa, Madagascar, Iran, California, Texas
Age Range
Beginning Stage in Treatise Usage:
Lower Cretaceous (Upper Aptian)
Beginning International Stage:
Aptian
Fraction Up In Beginning Stage:
66
Beginning Date:
115.99
Ending Stage in Treatise Usage:
Lower Cretaceous (Lower Albian)
Ending International Stage:
Albian
Fraction Up In Ending Stage:
25
Ending Date:
110.03
Description
Up to 400 mm in diameter, whorl section depressed in initial stage and sometimes in later stages, early whorls hexagonal or rectangular in section, with flat or concave venter and angular shoulders, primary ribs straight or flexuous, tuberculate at umbilical margin, and branching at lateral tubercle, secondary ribs intercalated or branching, all ribs nodose on shoulders, later tubercles disappearing and venter becoming rounded, test thickened on crest of ribs