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Gemma
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Veneracea (Venus clams)
Family:
Veneridae
Subfamily:
Gemminae
Formal Genus Name and Reference:
Gemma DESHAYES, 1853
Type Species:
Venus gemma TOTTEN, 1834, T
Images
(Click to enlarge in a new window)
Fig. E147,6. *G. gemma (Totten), Rec., W.Atl.; 6a,b, RV ext., int., X10 (Dall,
1900)
Synonyms
Totteniana
Geographic Distribution
E.N.Am.
Age Range
Beginning Stage in Treatise Usage:
Eoc.
Beginning International Stage:
Ypresian
Fraction Up In Beginning Stage:
0
Beginning Date:
56
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Ovate, pallial sinus triangular
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Veneracea (Venus clams)
Family:
Veneridae
Subfamily:
Gemminae
Formal Genus Name and Reference:
Gemma DESHAYES, 1853
Type Species:
Venus gemma TOTTEN, 1834, T
Images
(Click to enlarge in a new window)
Fig. E147,6. *G. gemma (Totten), Rec., W.Atl.; 6a,b, RV ext., int., X10 (Dall,
1900)
Synonyms
Totteniana
Geographic Distribution
E.N.Am.
Age Range
Beginning Stage in Treatise Usage:
Eoc.
Beginning International Stage:
Ypresian
Fraction Up In Beginning Stage:
0
Beginning Date:
56
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Ovate, pallial sinus triangular