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Crassatella
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Crassatellacea
Family:
Crassatellidae
Subfamily:
Crassatellinae
Formal Genus Name and Reference:
Crassatella LAMARCK, 1799
Type Species:
Mactra cygnaea Lamarck, 1799 (non Chemnitz, 1782) ( = C. gibba Lamarck, 1801 =Venus ponderosa Gmelin, 1791), SD SCHMIDT, 1818
Images
(Click to enlarge in a new window)
Fig. E73,5. C. (C.) ponderosa (Gmelin), M.Eoc., France(Paris basin), 5a-c, LV ext., int., RV int., X0.5 (Chavan, n, Deshayes, 1837)
Synonyms
Geographic Distribution
Eu.-N.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Mio.
Ending International Stage:
Messinian
Fraction Up In Ending Stage:
100
Ending Date:
5.34
Description
Subtrapezoidal, thick, prosogyrous beaks. Concentric ribbing and posterior angulation. Lunule and escutcheon deeply sunken. Resilial pit large, but not reaching lower margin of plate. Scars broad, anterior one reniform, posterior one ovate and truncate. Valve margins finely crenulate.
References
Lamarck, J. B. de, 1799, Prodrome d'une nouvelle classification des coquilles, comprenant une rédaction appropriée des caractères génériques, et l'établissement d'un grand nombre de genres nouveaux: Soc. Histoire Nat. Paris, Mém. v. 1, p. 63-91. 1801, Système des animaux sans vertèbres: viii + 432 p. (Paris).
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Crassatellacea
Family:
Crassatellidae
Subfamily:
Crassatellinae
Formal Genus Name and Reference:
Crassatella LAMARCK, 1799
Type Species:
Mactra cygnaea Lamarck, 1799 (non Chemnitz, 1782) ( = C. gibba Lamarck, 1801 =Venus ponderosa Gmelin, 1791), SD SCHMIDT, 1818
Images
(Click to enlarge in a new window)
Fig. E73,5. C. (C.) ponderosa (Gmelin), M.Eoc., France(Paris basin), 5a-c, LV ext., int., RV int., X0.5 (Chavan, n, Deshayes, 1837)
Synonyms
Geographic Distribution
Eu.-N.Am.
Age Range
Beginning Stage in Treatise Usage:
M.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Mio.
Ending International Stage:
Messinian
Fraction Up In Ending Stage:
100
Ending Date:
5.34
Description
Subtrapezoidal, thick, prosogyrous beaks. Concentric ribbing and posterior angulation. Lunule and escutcheon deeply sunken. Resilial pit large, but not reaching lower margin of plate. Scars broad, anterior one reniform, posterior one ovate and truncate. Valve margins finely crenulate.
References
Lamarck, J. B. de, 1799, Prodrome d'une nouvelle classification des coquilles, comprenant une rédaction appropriée des caractères génériques, et l'établissement d'un grand nombre de genres nouveaux: Soc. Histoire Nat. Paris, Mém. v. 1, p. 63-91. 1801, Système des animaux sans vertèbres: viii + 432 p. (Paris).