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Thetis
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Lucinacea
Family:
Mactromyidae
Formal Genus Name and Reference:
Thetis J. de C. SOWERBY, 1826
Type Species:
T. major, M (=Corbula laevigata Sowerby, 1818, non Thetis Oken, 1815, inval., nec C. B. Adams, 1845, nec H. Adams & A. ADAMS, 1856)
Images
(Click to enlarge in a new window)
Fig. E15,2. *T. laetJ1gata (SOWERBY), L.Cret., Eng.; 2a,b, RV and LV hinges, X1.25 (1l9)
Synonyms
Thetironia, Fimbriella
Geographic Distribution
Eu.-N.Am.
Age Range
Beginning Stage in Treatise Usage:
L.Cret.(Alb.)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
0
Beginning Date:
113.2
Ending Stage in Treatise Usage:
U.Cret.(Cenoman.)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Subcircular, tumid, with prominent nearly orthogyrous beaks, surface with concentric and laterally radial sculpture; ligament thin; hinge with AIV continued above and behind tubercular 2 as hooked tooth, RV with 2 superposed tuber- culiform cardinals. Oblique internal rib resembling pallial sinus. [The American species, known as Thesiopsis MEEK , shows a venerid hinge.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Lucinacea
Family:
Mactromyidae
Formal Genus Name and Reference:
Thetis J. de C. SOWERBY, 1826
Type Species:
T. major, M (=Corbula laevigata Sowerby, 1818, non Thetis Oken, 1815, inval., nec C. B. Adams, 1845, nec H. Adams & A. ADAMS, 1856)
Images
(Click to enlarge in a new window)
Fig. E15,2. *T. laetJ1gata (SOWERBY), L.Cret., Eng.; 2a,b, RV and LV hinges, X1.25 (1l9)
Synonyms
Thetironia, Fimbriella
Geographic Distribution
Eu.-N.Am.
Age Range
Beginning Stage in Treatise Usage:
L.Cret.(Alb.)
Beginning International Stage:
Albian
Fraction Up In Beginning Stage:
0
Beginning Date:
113.2
Ending Stage in Treatise Usage:
U.Cret.(Cenoman.)
Ending International Stage:
Cenomanian
Fraction Up In Ending Stage:
100
Ending Date:
93.9
Description
Subcircular, tumid, with prominent nearly orthogyrous beaks, surface with concentric and laterally radial sculpture; ligament thin; hinge with AIV continued above and behind tubercular 2 as hooked tooth, RV with 2 superposed tuber- culiform cardinals. Oblique internal rib resembling pallial sinus. [The American species, known as Thesiopsis MEEK , shows a venerid hinge.]