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Platyceras
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Trochina
Superfamily:
Platyceratacea
Family:
Platyceratidae
Formal Genus Name and Reference:
Platyceras CONRAD, 1840
Type Species:
Pileopsis vetusta J.deC. SOWERBY, 1829
Images
(Click to enlarge in a new window)
Fig. 153,4. *P. (P.) vetustum (J.deC.Sowerby), Miss., Ire.; 4a, oblique apertural view, 4b, apical view, both X0.7
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Sil.
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
M.Perm.
Ending International Stage:
Capitanian
Fraction Up In Ending Stage:
100
Ending Date:
259.55
Description
Subgenera varying from naticiform to completely disjunct, some earlier species with spiral and collabral threads or with collabral lines, some with hollow spines arising as marginal tubes, apertural margin of many shells deeply sinuate, conforming to irregularities of crinoid calyx to which it was attached during life. [Apertural irregularities primarily record characters of the host crinoid, not of the gastropod, the reentrants of some shells resembling pleurotomarian sinuses or slits, but having no homologous function.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Trochina
Superfamily:
Platyceratacea
Family:
Platyceratidae
Formal Genus Name and Reference:
Platyceras CONRAD, 1840
Type Species:
Pileopsis vetusta J.deC. SOWERBY, 1829
Images
(Click to enlarge in a new window)
Fig. 153,4. *P. (P.) vetustum (J.deC.Sowerby), Miss., Ire.; 4a, oblique apertural view, 4b, apical view, both X0.7
Synonyms
Geographic Distribution
cosmop.
Age Range
Beginning Stage in Treatise Usage:
Sil.
Beginning International Stage:
Rhuddanian
Fraction Up In Beginning Stage:
0
Beginning Date:
443.07
Ending Stage in Treatise Usage:
M.Perm.
Ending International Stage:
Capitanian
Fraction Up In Ending Stage:
100
Ending Date:
259.55
Description
Subgenera varying from naticiform to completely disjunct, some earlier species with spiral and collabral threads or with collabral lines, some with hollow spines arising as marginal tubes, apertural margin of many shells deeply sinuate, conforming to irregularities of crinoid calyx to which it was attached during life. [Apertural irregularities primarily record characters of the host crinoid, not of the gastropod, the reentrants of some shells resembling pleurotomarian sinuses or slits, but having no homologous function.]