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Isocyprina
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Arcticacea
Family:
Arcticidae
Formal Genus Name and Reference:
Isocyprina RODER, 1882
Type Species:
Cardium cyreniforme
BUVIGNIER, 1852; SD COSSMANN, 1921
Images
(Click to enlarge in a new window)
Fig. E128, 2. *I. (1.) cyreniformis (Buvignier), U.Jur. (Oxford), Eng., 2 a-c, LV ext., LV and RV hinges, X0.7 (Casey)
Synonyms
Geographic Distribution
Eu.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
U.Jur.
Ending International Stage:
Tithonian
Fraction Up In Ending Stage:
100
Ending Date:
143.1
Description
Suborbicular or ovate, evenly inflated or with feeble posterior carina; lunule superficial, mostly bounded by impressed line; escutcheon wanting; surface smooth or with fine concentric lines; hinge formula, AI(lII) (1) (3a) 3b PI/All (2a) 2b 4b (Pll) (teeth indicated in parentheses reduced or obso- lete), lamina All (+2a) joined to 2b by vinculum, Pll merged into margin, PI strong, elongate.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Arcticacea
Family:
Arcticidae
Formal Genus Name and Reference:
Isocyprina RODER, 1882
Type Species:
Cardium cyreniforme
BUVIGNIER, 1852; SD COSSMANN, 1921
Images
(Click to enlarge in a new window)
Fig. E128, 2. *I. (1.) cyreniformis (Buvignier), U.Jur. (Oxford), Eng., 2 a-c, LV ext., LV and RV hinges, X0.7 (Casey)
Synonyms
Geographic Distribution
Eu.-S.Am.
Age Range
Beginning Stage in Treatise Usage:
Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
U.Jur.
Ending International Stage:
Tithonian
Fraction Up In Ending Stage:
100
Ending Date:
143.1
Description
Suborbicular or ovate, evenly inflated or with feeble posterior carina; lunule superficial, mostly bounded by impressed line; escutcheon wanting; surface smooth or with fine concentric lines; hinge formula, AI(lII) (1) (3a) 3b PI/All (2a) 2b 4b (Pll) (teeth indicated in parentheses reduced or obso- lete), lamina All (+2a) joined to 2b by vinculum, Pll merged into margin, PI strong, elongate.