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Pelagiella
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Gastropoda? - Incertae Sedis
Superfamily:
Pelagiellacea
Family:
Pelagiellidae
Formal Genus Name and Reference:
Pelagiella MATTHEW, 1895
Type Species:
Cyrtolites atlantoides MATTHEW, 1894
Images
(Click to enlarge in a new window)
Fig. 216,2. *P. atlantoides (Matthew), L.Cam., N.B., X4.
Synonyms
Parapelagiella, Proeccyliopterus, Protoscaevogyra, Semicircularia
Geographic Distribution
N.Am.NE.Asia
Age Range
Beginning Stage in Treatise Usage:
Cam. (1960 version => now Epoch 2)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Cam.
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Dextral or sinistral, with broad blunt apex and rapidly expanding helicocone, shallow sinus culminating at periphery or with one or more sinuses above or below periphery, interior marginal thickening of gerontic shell indicated by steinkerns. [Parapelagiella was proposed for forms without the supposed constricted apertural margin of Pelagiella, but this is a gerontic feature of Pelagiella itself, though seen rarely; Proeccyliopterus was proposed for forms with a ridge on the upper shell surface and Protoscaevogyra for sinistral forms. In so-called Proeccyliopterus sinuses above and below the periphery generate ridges, and there are both dextral and sinistral individuals in the type species. Semicircularia is based on steinkerns of a sinistral form, the supposed short blunt uncoiled spire denoting apical filling of the shell. All these forms are considered to be congeneric with Pelagiella.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Gastropoda? - Incertae Sedis
Superfamily:
Pelagiellacea
Family:
Pelagiellidae
Formal Genus Name and Reference:
Pelagiella MATTHEW, 1895
Type Species:
Cyrtolites atlantoides MATTHEW, 1894
Images
(Click to enlarge in a new window)
Fig. 216,2. *P. atlantoides (Matthew), L.Cam., N.B., X4.
Synonyms
Parapelagiella, Proeccyliopterus, Protoscaevogyra, Semicircularia
Geographic Distribution
N.Am.NE.Asia
Age Range
Beginning Stage in Treatise Usage:
Cam. (1960 version => now Epoch 2)
Beginning International Stage:
Cambrian Stage 3
Fraction Up In Beginning Stage:
0
Beginning Date:
521
Ending Stage in Treatise Usage:
Cam.
Ending International Stage:
Cambrian Stage 10
Fraction Up In Ending Stage:
100
Ending Date:
486.85
Description
Dextral or sinistral, with broad blunt apex and rapidly expanding helicocone, shallow sinus culminating at periphery or with one or more sinuses above or below periphery, interior marginal thickening of gerontic shell indicated by steinkerns. [Parapelagiella was proposed for forms without the supposed constricted apertural margin of Pelagiella, but this is a gerontic feature of Pelagiella itself, though seen rarely; Proeccyliopterus was proposed for forms with a ridge on the upper shell surface and Protoscaevogyra for sinistral forms. In so-called Proeccyliopterus sinuses above and below the periphery generate ridges, and there are both dextral and sinistral individuals in the type species. Semicircularia is based on steinkerns of a sinistral form, the supposed short blunt uncoiled spire denoting apical filling of the shell. All these forms are considered to be congeneric with Pelagiella.]