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Helcionella
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Bellerophontina
Superfamily:
Helcionellacea
Family:
Helcionellidae
Formal Genus Name and Reference:
Helcionella Grabau & SHIMER, 1909
Type Species:
Metoptoma? rugosa Hall, 1847= Helcion subrugosa d'Orbigny, 1850, pro H. rugosa (Hall) d'Orbigny, 1850, non H. rugosa J.SOWERBY, 1817
Images
(Click to enlarge in a new window)
Fig. 89,3. *H. subrugosa (d'Orbigny), L.Cam., N.Y., 3a,b, individuals showing extremes in variation, X3.3.
Synonyms
Quilcanella, ?Pichynella
Geographic Distribution
N.Am.-N. Afr.-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
Shell moderately low to high cap-shaped, with very strong concentric rugae, muscle scars unknown
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Bellerophontina
Superfamily:
Helcionellacea
Family:
Helcionellidae
Formal Genus Name and Reference:
Helcionella Grabau & SHIMER, 1909
Type Species:
Metoptoma? rugosa Hall, 1847= Helcion subrugosa d'Orbigny, 1850, pro H. rugosa (Hall) d'Orbigny, 1850, non H. rugosa J.SOWERBY, 1817
Images
(Click to enlarge in a new window)
Fig. 89,3. *H. subrugosa (d'Orbigny), L.Cam., N.Y., 3a,b, individuals showing extremes in variation, X3.3.
Synonyms
Quilcanella, ?Pichynella
Geographic Distribution
N.Am.-N. Afr.-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
Shell moderately low to high cap-shaped, with very strong concentric rugae, muscle scars unknown