Physical 

Marsh Snails are univalves that grow to approximately 1.5 cm.  They are top shaped and have dark bands around their white shells.  Color variations are common.

Image by Robert Aguilar, Smithsonian Environmental Research Center on Flickr

Habitat

M. bidentatus are found in marshes along the estuaries of the east coast of the United States.  The marshes are primarily intertidal.

 

Feeding 

M. bidentatus are scavengers, and feed on dead or decaying matter in the marsh such as decayed fish and plant matter.