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Benthic Invertebrates

Gastropoda - Snails

Viviparidae - mystery snails

  
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Generally found in flowing water or proximity to flowing water (e.g., river mouths). Adults >25mm. Live-bearers - juvenile snails are retained inside the mantle of the mother for several weeks. Feed primarily on particulate detritus in soft sediments.

Campeloma decisum

Campeloma decisum

Shell aperture oval - operculum with a concentric (central) nucleus. Outer shell surface greenish in color with no banding, shell interior white to light blue. Shoulders of whorls rounded and distinct from previous whorl - sutures that separate whorls are indented. Smooth with no sculpturing other than fine striae. 25mm.

 

Viviparus georgianus

 

The shell aperture and operculum nearly circular - operculum with a concentric (central) nucleus. Outer shell surface brown to tan with 4 bands. Shell interior usually white or with a purplish hue. Shoulders between shell whorls weak, sutures are indented. 38mm.

Cipangopaludina chinensis malleataCipangopaludina japonica

Cipangopaludina chinensis and japonica

Shell aperature round to oval with a reflected, black pigmented lip. Operculum with a submarginal (located nearer the outer lip) nucleus. Outer shell surface light to dark olive-green, without any color bands. Whorls are strongly convex, with a very slight shoulder, and the suture is deeply indented. Shell sculpture consists of fine growth lines, spiral lines and fine to moderate malleations over the entire surface.

C. chinensis - shell with more rounded shoulders and broader shape

C. japonica - narrower and more turreted shell - sculpted (carinate). to 65mm.

Globe icon indicates a link to a non-NOAA siteGastropod anatomy - Freshwater Mollusk Conservation Society

Globe icon indicates a link to a non-NOAA siteProfile - University of Michigan Animal diversity web

Species List

  Genus Species Reported Locations** Description
      X MEO  
Brown mystery snail Campeloma decisum XE Widely distributed across the eastern US and Canada. Parthogenetic.
Globe icon indicates a link to a non-NOAA siteProfile-Aquasnail
Globe icon indicates a link to a non-NOAA siteCandian Distribution
Chinese mystery snail Cipangopaludina chinensis malleata O Exotic.
Globe icon indicates a link to a non-NOAA siteProfile - USGS
GLANSIS
Japanese mystery snail japonica E

Exotic.
Globe icon indicates a link to a non-NOAA siteProfile - USGS
GLANSIS

Banded mystery snail Viviparus georgianus M

Native to southern US but expanding its range northward.
Globe icon indicates a link to a non-NOAA siteProfile - USGS
Globe icon indicates a link to a non-NOAA siteProfile-Aquasnail
GLANSIS

** Reported locations based on a limited literature search. Codes indicate presence reported but absence of a code should not be interpreted as a species absence.

M (Lake Michigan) based on combination of:

E (Lake Erie) based on:

O (Lake Ontario) based on:

X (Great Lakes coastal wetlands) based on:

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