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Ortonella
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Arcoida
Superfamily:
Cyrtodontacea
Family:
Cyrtodontidae
Formal Genus Name and Reference:
Ortonella ULRICH, 1893 (1894)
Type Species:
*Cyprieardites hainesi S. A. MILLER, 1874; OD
Images
(Click to enlarge in a new window)
Fig. C1,9. * 0. hainesi (MILLER); 9a, LV ext. showing ornamentation; 9b, LV into showing dentition; both X I (929).
Synonyms
Geographic Distribution
USA(Ind.)
Age Range
Beginning Stage in Treatise Usage:
Ord.(Richmond.)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
66.7
Beginning Date:
447.72
Ending Stage in Treatise Usage:
Ord.(Richmond.)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
100
Ending Date:
445.21
Description
Subquadrate, beaks anterior, umbonal ridge moderate; surface with concentric lines of growth; hinge as in Cyrtodonta but cardinal teeth relatively stronger and immediately under beaks; 2 short posterior lamellar teeth in each valve.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Arcoida
Superfamily:
Cyrtodontacea
Family:
Cyrtodontidae
Formal Genus Name and Reference:
Ortonella ULRICH, 1893 (1894)
Type Species:
*Cyprieardites hainesi S. A. MILLER, 1874; OD
Images
(Click to enlarge in a new window)
Fig. C1,9. * 0. hainesi (MILLER); 9a, LV ext. showing ornamentation; 9b, LV into showing dentition; both X I (929).
Synonyms
Geographic Distribution
USA(Ind.)
Age Range
Beginning Stage in Treatise Usage:
Ord.(Richmond.)
Beginning International Stage:
Katian
Fraction Up In Beginning Stage:
66.7
Beginning Date:
447.72
Ending Stage in Treatise Usage:
Ord.(Richmond.)
Ending International Stage:
Katian
Fraction Up In Ending Stage:
100
Ending Date:
445.21
Description
Subquadrate, beaks anterior, umbonal ridge moderate; surface with concentric lines of growth; hinge as in Cyrtodonta but cardinal teeth relatively stronger and immediately under beaks; 2 short posterior lamellar teeth in each valve.