Mystery Snails


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

News & Events 9/2/2018

Mousam Public Launch Closing

ATTENTION:   The Department of Inland Fisheries and Wildlife is planning to reconstruct the public boat launch on Mousam Lake this fall.  They will need to close the facility from approximately September 17th to October 5th to complete the project.  Please plan accordingly as it relates to taking your watercraft out of Mousam.  We are unaware of any intentional draw down of the lake level to perform this repair however we will let you know if this is to take place prior to the start date.

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Local News 3/26/2015

Eves: Maine towns struggle to staff volunteer fire departments


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