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Pseudotrapezium
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Arcticacea
Family:
Arcticidae
Formal Genus Name and Reference:
Pseudotrapezium FISCHER, 1887
Type Species:
Cypricardia bathonica d'Orbigny, 1850 (=*C. cordiformis DESHAYES, 1830), M
Images
(Click to enlarge in a new window)
Fig. E128, 13. *P. cordiforme (Deshayes), M.Jur.(Bathon.), Eng., 13a, RV ext., X0.7, 13 b, c, hinges, X0.5 (Casey)"
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
Jur.(Lias..)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
Jur.(Portland.)
Ending International Stage:
Berriasian
Fraction Up In Ending Stage:
25
Ending Date:
141.75
Description
Subtrigonal to cuneiform, umbones prominent, beaks strongly prosogyrate, posterior carination strong, hinge with anterior laterals short, 1 strong, restricting development of 2a in LV, 3a and 3b united into a single angulate structure
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Heterodonta
Order:
Veneroida
Superfamily:
Arcticacea
Family:
Arcticidae
Formal Genus Name and Reference:
Pseudotrapezium FISCHER, 1887
Type Species:
Cypricardia bathonica d'Orbigny, 1850 (=*C. cordiformis DESHAYES, 1830), M
Images
(Click to enlarge in a new window)
Fig. E128, 13. *P. cordiforme (Deshayes), M.Jur.(Bathon.), Eng., 13a, RV ext., X0.7, 13 b, c, hinges, X0.5 (Casey)"
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
Jur.(Lias..)
Beginning International Stage:
Hettangian
Fraction Up In Beginning Stage:
0
Beginning Date:
201.36
Ending Stage in Treatise Usage:
Jur.(Portland.)
Ending International Stage:
Berriasian
Fraction Up In Ending Stage:
25
Ending Date:
141.75
Description
Subtrigonal to cuneiform, umbones prominent, beaks strongly prosogyrate, posterior carination strong, hinge with anterior laterals short, 1 strong, restricting development of 2a in LV, 3a and 3b united into a single angulate structure