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Polygyrina
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Caenogastropoda
Superfamily:
Loxonematacea
Family:
Loxonematidae
Formal Genus Name and Reference:
Polygyrina KOKEN, 1892
Type Species:
Turritella lommelii Münster, 1841, SD COSSMANN, 1909
Images
(Click to enlarge in a new window)
Fig. 206, 7. *P. lommeli (Münster), M.Trias-(Ladin.), S.Tyrol, 7a, early whorls, X3, b-d, later whorls, X1 (64).
Synonyms
Geographic Distribution
Eu.-Asia
Age Range
Beginning Stage in Treatise Usage:
L.Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
U.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Whorls many, strongly convex, protoconch obtuse, domelike, growth lines forming broad, symmetrical sinus on spire whorls, their complete curve parasigmoid
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Caenogastropoda
Superfamily:
Loxonematacea
Family:
Loxonematidae
Formal Genus Name and Reference:
Polygyrina KOKEN, 1892
Type Species:
Turritella lommelii Münster, 1841, SD COSSMANN, 1909
Images
(Click to enlarge in a new window)
Fig. 206, 7. *P. lommeli (Münster), M.Trias-(Ladin.), S.Tyrol, 7a, early whorls, X3, b-d, later whorls, X1 (64).
Synonyms
Geographic Distribution
Eu.-Asia
Age Range
Beginning Stage in Treatise Usage:
L.Trias.
Beginning International Stage:
Induan
Fraction Up In Beginning Stage:
0
Beginning Date:
251.9
Ending Stage in Treatise Usage:
U.Trias.
Ending International Stage:
Rhaetian
Fraction Up In Ending Stage:
100
Ending Date:
201.36
Description
Whorls many, strongly convex, protoconch obtuse, domelike, growth lines forming broad, symmetrical sinus on spire whorls, their complete curve parasigmoid