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Dimorphoptychia
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Neritopsina
Superfamily:
Neritacea
Family:
Helicinidae (land snails)
Subfamily:
Dimorphoptychiinae
Formal Genus Name and Reference:
Dimorphoptychia SANDBERGER, 1871
Type Species:
Helix arnouldi MICHAUD, 1837
Images
(Click to enlarge in a new window)
Fig. 187,4. *D. arnouldi (Michaud), Paleoc., Fr., X2 (147)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Paleoc.
Ending International Stage:
Thanetian
Fraction Up In Ending Stage:
100
Ending Date:
56
Description
Small, lenticular, umbilicus not evident, periphery with blunt keel
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Neritopsina
Superfamily:
Neritacea
Family:
Helicinidae (land snails)
Subfamily:
Dimorphoptychiinae
Formal Genus Name and Reference:
Dimorphoptychia SANDBERGER, 1871
Type Species:
Helix arnouldi MICHAUD, 1837
Images
(Click to enlarge in a new window)
Fig. 187,4. *D. arnouldi (Michaud), Paleoc., Fr., X2 (147)
Synonyms
Geographic Distribution
Eu.
Age Range
Beginning Stage in Treatise Usage:
U.Cret.(Turon.)
Beginning International Stage:
Turonian
Fraction Up In Beginning Stage:
0
Beginning Date:
93.9
Ending Stage in Treatise Usage:
Paleoc.
Ending International Stage:
Thanetian
Fraction Up In Ending Stage:
100
Ending Date:
56
Description
Small, lenticular, umbilicus not evident, periphery with blunt keel