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Eoschizodus
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Myophoriidae
Formal Genus Name and Reference:
Eoschizodus COX, 1951, p. 369
Type Species:
Megalodus truncatus GOLDFUSS, 1837, p. 184
Images
(Click to enlarge in a new window)
Fig. D63,4. *E. truncatus (Goldfuss), Dev., Ger., 4 a, b, LV ext. and int. hinge, X1, 4 c, RV int. hinge, X1 (47)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Subtrigonal to ovate, smooth, subequilateral to strongly inequilateral, subtruncate or rounded posteriorly, umbones prosogyrous or orthogyrous, marginal carina well defined in some species, absent in others, no escutcheon, left valve with triangular, simple or bilobed median tooth, anterior tooth of moderate strength and posterior tooth narrow, marginal, right valve with anterior tooth stoutly triangular and posterior tooth elongate, teeth not striated, myophorous buttress absent or indistinct
References
Cox, L. R., 1951, The lamellibranch genus Schizodus and other Palaeozoic Myophoriidae: Geol. Mag., v. 88 (Sept.-Oct.), p. 362-371.
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Myophoriidae
Formal Genus Name and Reference:
Eoschizodus COX, 1951, p. 369
Type Species:
Megalodus truncatus GOLDFUSS, 1837, p. 184
Images
(Click to enlarge in a new window)
Fig. D63,4. *E. truncatus (Goldfuss), Dev., Ger., 4 a, b, LV ext. and int. hinge, X1, 4 c, RV int. hinge, X1 (47)
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Dev.
Beginning International Stage:
Lochkovian
Fraction Up In Beginning Stage:
0
Beginning Date:
419
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Subtrigonal to ovate, smooth, subequilateral to strongly inequilateral, subtruncate or rounded posteriorly, umbones prosogyrous or orthogyrous, marginal carina well defined in some species, absent in others, no escutcheon, left valve with triangular, simple or bilobed median tooth, anterior tooth of moderate strength and posterior tooth narrow, marginal, right valve with anterior tooth stoutly triangular and posterior tooth elongate, teeth not striated, myophorous buttress absent or indistinct
References
Cox, L. R., 1951, The lamellibranch genus Schizodus and other Palaeozoic Myophoriidae: Geol. Mag., v. 88 (Sept.-Oct.), p. 362-371.