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Pararaphistoma
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Pleurotomariina
Superfamily:
Pleurotomariacea
Family:
Raphistomatidae
Subfamily:
Raphistomatinae
Formal Genus Name and Reference:
Pararaphistoma VOSTANOVA, 1955
Type Species:
Helicites qualteriatus SCHLOTHEIM, 1820
Images
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Synonyms
Pararaphistoma (Climacoraphistoma)
Geographic Distribution
Eu.-N. Am.
Age Range
Beginning Stage in Treatise Usage:
Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Shell lenticular to low-spired with "stair step" profile, widely phaneromphalous, growth lines sweeping back smoothly from suture, without a sigmoidal bend
References
Vostakova, V. A., 1955, Ordovician gastropods of the Leningrad and Baltic Sea region: Leningrad Universitet Nauchnoissledovate'skii InstitutZemnoi Cory Paleontologischeskaia Laboratoriia, Voprosy Paleontologii, v. 2, p. 82123, pl. 1-8 [all Russ.] (Moskva).
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Archaeogastropoda
Suborder:
Pleurotomariina
Superfamily:
Pleurotomariacea
Family:
Raphistomatidae
Subfamily:
Raphistomatinae
Formal Genus Name and Reference:
Pararaphistoma VOSTANOVA, 1955
Type Species:
Helicites qualteriatus SCHLOTHEIM, 1820
Images
(Click to enlarge in a new window)Synonyms
Pararaphistoma (Climacoraphistoma)
Geographic Distribution
Eu.-N. Am.
Age Range
Beginning Stage in Treatise Usage:
Ord.
Beginning International Stage:
Tremadocian
Fraction Up In Beginning Stage:
0
Beginning Date:
486.85
Ending Stage in Treatise Usage:
Ord.
Ending International Stage:
Hirnantian
Fraction Up In Ending Stage:
100
Ending Date:
443.07
Description
Shell lenticular to low-spired with "stair step" profile, widely phaneromphalous, growth lines sweeping back smoothly from suture, without a sigmoidal bend
References
Vostakova, V. A., 1955, Ordovician gastropods of the Leningrad and Baltic Sea region: Leningrad Universitet Nauchnoissledovate'skii InstitutZemnoi Cory Paleontologischeskaia Laboratoriia, Voprosy Paleontologii, v. 2, p. 82123, pl. 1-8 [all Russ.] (Moskva).