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Grammatodon
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Arcoida
Superfamily:
Arcacea
Family:
Parallelodontidae
Subfamily:
Grammatodontinae - Grammatodon Group
Formal Genus Name and Reference:
Grammatodon Meek & HAYDEN, 1861
Type Species:
Arca (Cucullaea) inornata Meek & HAYDEN, 1859, OD
Images
(Click to enlarge in a new window)
Synonyms
Pseudomacrodon
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Jur.
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Length less than twice height, ovoid, umbones about 0.3 or more back of anterior margin, smooth over middle of shell or costellate, valve margins closed, myophoric buttress lacking, inner margin of hinge plate straight or slightly curved, with several nearly parallel and horizontal posterior pseudolaterals and series of small, generally oblique cardinals converging toward point below beaks
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Arcoida
Superfamily:
Arcacea
Family:
Parallelodontidae
Subfamily:
Grammatodontinae - Grammatodon Group
Formal Genus Name and Reference:
Grammatodon Meek & HAYDEN, 1861
Type Species:
Arca (Cucullaea) inornata Meek & HAYDEN, 1859, OD
Images
(Click to enlarge in a new window)Synonyms
Pseudomacrodon
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Jur.
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Length less than twice height, ovoid, umbones about 0.3 or more back of anterior margin, smooth over middle of shell or costellate, valve margins closed, myophoric buttress lacking, inner margin of hinge plate straight or slightly curved, with several nearly parallel and horizontal posterior pseudolaterals and series of small, generally oblique cardinals converging toward point below beaks