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Oxytoma
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Pteriina
Superfamily:
Pectinacea (scallops and relatives)
Family:
Oxytomidae
Formal Genus Name and Reference:
Oxytoma MEEK, 1864, p. 39
Type Species:
Avicula muensteri Bronn, 1830, p. 164 (=Avicula inequivalvis J. SOWERBY, 1819, p. 78), OD
Images
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Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Trias.
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Suborbicular and acline to ovate or broadly lunate and prosocline, valves commonly discordant, LV varying in convexity with umbo protruding, RV flat or feebly convex, posterior wing of both valves more or less elongated, sharply pointed, left anterior wing small, subauricular notch deep, acute, with ctenolium, angular projection of shell margin extending on inner side of notch, ligamental area almost parallel with plane of valve margins in LV, almost perpendicular to it in RV, no hinge teeth
References
Meek, F. B., 1864, Check list of the invertebrate fossils of North America. Cretaceous and Jurassic: Smithsonian Misc. Coll., no. 177 (in v. 7), 40 p .
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Pteriomorphia
Order:
Pterioida
Suborder:
Pteriina
Superfamily:
Pectinacea (scallops and relatives)
Family:
Oxytomidae
Formal Genus Name and Reference:
Oxytoma MEEK, 1864, p. 39
Type Species:
Avicula muensteri Bronn, 1830, p. 164 (=Avicula inequivalvis J. SOWERBY, 1819, p. 78), OD
Images
(Click to enlarge in a new window) Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
U.Trias.
Beginning International Stage:
Carnian
Fraction Up In Beginning Stage:
0
Beginning Date:
237
Ending Stage in Treatise Usage:
U.Cret.
Ending International Stage:
Maastrichtian
Fraction Up In Ending Stage:
100
Ending Date:
66.04
Description
Suborbicular and acline to ovate or broadly lunate and prosocline, valves commonly discordant, LV varying in convexity with umbo protruding, RV flat or feebly convex, posterior wing of both valves more or less elongated, sharply pointed, left anterior wing small, subauricular notch deep, acute, with ctenolium, angular projection of shell margin extending on inner side of notch, ligamental area almost parallel with plane of valve margins in LV, almost perpendicular to it in RV, no hinge teeth
References
Meek, F. B., 1864, Check list of the invertebrate fossils of North America. Cretaceous and Jurassic: Smithsonian Misc. Coll., no. 177 (in v. 7), 40 p .