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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

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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