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Opis
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Crassatellacea
Family:
Astartidae
Subfamily:
Opinae
Formal Genus Name and Reference:
Opis DEFRANCE, 1825 (1824, nom. nud.)
Type Species:
Trigonia cardissoides LAMARCK, 1819, M
Images
(Click to enlarge in a new window)
Fig. E71,2. *O. (O.) cardissoides (Lamarck), U.Cret.(Cenoman.), Belg., 2a, b, RV ext., ant., 2c, d, LV hinge view, ant., 2e, LV int. mold, × 1 (50, d'Archiac, 1847).
Synonyms
Geographic Distribution
Eu.-Madag.-N.Am.-Japan
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Obliquely oblong, with prominent beaks, Ventral margin curved in front of medioposterior undulation, posterior margin then truncated, Concentric ribbing, More or less shallow lunule, Large hinge, without laterals, one strong RV trigonal and 2 LV cardinals, commonly with their lateral faces striated, 4b stronger than 2, Ligament narrow, Margin more or less crenate.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Crassatellacea
Family:
Astartidae
Subfamily:
Opinae
Formal Genus Name and Reference:
Opis DEFRANCE, 1825 (1824, nom. nud.)
Type Species:
Trigonia cardissoides LAMARCK, 1819, M
Images
(Click to enlarge in a new window)
Fig. E71,2. *O. (O.) cardissoides (Lamarck), U.Cret.(Cenoman.), Belg., 2a, b, RV ext., ant., 2c, d, LV hinge view, ant., 2e, LV int. mold, × 1 (50, d'Archiac, 1847).
Synonyms
Geographic Distribution
Eu.-Madag.-N.Am.-Japan
Age Range
Beginning Stage in Treatise Usage:
L.Jur.(Lias.)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Obliquely oblong, with prominent beaks, Ventral margin curved in front of medioposterior undulation, posterior margin then truncated, Concentric ribbing, More or less shallow lunule, Large hinge, without laterals, one strong RV trigonal and 2 LV cardinals, commonly with their lateral faces striated, 4b stronger than 2, Ligament narrow, Margin more or less crenate.