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Hydrobia
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Caenogastropoda
Superfamily:
Rissoacea
Family:
Hydrobiidae
Formal Genus Name and Reference:
Hydrobia HARTMANN, 1821
Type Species:
Cyclostoma acutum Draparnaud, 1805, SD GRAY, 1847
Images
(Click to enlarge in a new window)
Synonyms
Paludestrina
Geographic Distribution
Perm.(Karroo), Rhodesia; U.Jur.(Oxford.)-Rec., cosmop.
Age Range
Beginning Stage in Treatise Usage:
Perm.(Karroo), U.Jur.(Oxford.)
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Entire shell, or early whorls only, acute, whorls convex, smooth or with collabral threads, apertural margin uninterrupted, not thickened. Family = Shell small or minute, smooth or with collabral threads or riblets, rarely spirally carinate. Operculum horny, spiral. [Mostly in fresh or brackish water.]
References
Museum or Author Information
Classification
Phylum:
Mollusca
Class:
Gastropoda
Subclass:
Prosobranchia
Order:
Caenogastropoda
Superfamily:
Rissoacea
Family:
Hydrobiidae
Formal Genus Name and Reference:
Hydrobia HARTMANN, 1821
Type Species:
Cyclostoma acutum Draparnaud, 1805, SD GRAY, 1847
Images
(Click to enlarge in a new window)Synonyms
Paludestrina
Geographic Distribution
Perm.(Karroo), Rhodesia; U.Jur.(Oxford.)-Rec., cosmop.
Age Range
Beginning Stage in Treatise Usage:
Perm.(Karroo), U.Jur.(Oxford.)
Beginning International Stage:
Asselian
Fraction Up In Beginning Stage:
0
Beginning Date:
298.89
Ending Stage in Treatise Usage:
Rec.
Ending International Stage:
Meghalayan
Fraction Up In Ending Stage:
100
Ending Date:
0
Description
Entire shell, or early whorls only, acute, whorls convex, smooth or with collabral threads, apertural margin uninterrupted, not thickened. Family = Shell small or minute, smooth or with collabral threads or riblets, rarely spirally carinate. Operculum horny, spiral. [Mostly in fresh or brackish water.]