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Schizodus
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Myophoriidae
Formal Genus Name and Reference:
Schizodus de Verneuil & MURCHISON, 1844, p. 505 (ex KING, MS)
Type Species:
Axinus obscurus J. Sowerby, 1821, p. 12, SD de VERNEUIL, 1845, p. 308
Images
(Click to enlarge in a new window)
Fig. D63,8a. *S. obsellrtls (SOWERBV), U.Perm., Eng.; RV ext., X1. -- Fig. D63,8b,c. S. harii MILLER, Penn., USA (Mo.) ; 8b,e, LV int., RV int., X1 (Miller, 1892; Beede, 1900)
Synonyms
Leptodomus, Priseonaia, Axinopsis, ?Niobe, ?Protosehizodlls, Sclzizodon, ?Protosclzizodon
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Ovate or trigonally ovate, sub- equilateral to strongly inequilateral, obliquely truncated and in some forms attenuated posteriorly, smooth; umbones usually feebly prosogyrous, more rarely opisthogyrous; marginal carina rounded off; no escutcheon; left valve with strong, bilobed median tooth, anterior tooth small and marginal, and posterior tooth obsolete or almost so; right valve with single stout, forward-directed tooth, posterior tooth being obsolete; no myophor- ous buttress.
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Bivalvia
Subclass:
Palaeoheterodonta
Order:
Trigonioida
Superfamily:
Trigoniacea
Family:
Myophoriidae
Formal Genus Name and Reference:
Schizodus de Verneuil & MURCHISON, 1844, p. 505 (ex KING, MS)
Type Species:
Axinus obscurus J. Sowerby, 1821, p. 12, SD de VERNEUIL, 1845, p. 308
Images
(Click to enlarge in a new window)
Fig. D63,8a. *S. obsellrtls (SOWERBV), U.Perm., Eng.; RV ext., X1. -- Fig. D63,8b,c. S. harii MILLER, Penn., USA (Mo.) ; 8b,e, LV int., RV int., X1 (Miller, 1892; Beede, 1900)
Synonyms
Leptodomus, Priseonaia, Axinopsis, ?Niobe, ?Protosehizodlls, Sclzizodon, ?Protosclzizodon
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Carb.
Beginning International Stage:
Tournaisian
Fraction Up In Beginning Stage:
0
Beginning Date:
359.3
Ending Stage in Treatise Usage:
Perm.
Ending International Stage:
Changhsingian
Fraction Up In Ending Stage:
100
Ending Date:
251.9
Description
Ovate or trigonally ovate, sub- equilateral to strongly inequilateral, obliquely truncated and in some forms attenuated posteriorly, smooth; umbones usually feebly prosogyrous, more rarely opisthogyrous; marginal carina rounded off; no escutcheon; left valve with strong, bilobed median tooth, anterior tooth small and marginal, and posterior tooth obsolete or almost so; right valve with single stout, forward-directed tooth, posterior tooth being obsolete; no myophor- ous buttress.