Planogrya asteriscus snails, otherwise known as the Eastern flat-whorl, can be found in northern and upper Michigan, northeastern Wisconsin, and also northeastern Maine. This type of snail prefers moist or swampy habitat. It is also found along the bank of rivers and marshes where clay and silt has built up from the moving water (Baker,1935). They have been found in habitat that also supports the northern white cedar tree. Common habitat for snailsHowever, it does not like to be in habitats where sphagnum (peat moss) has become dominate (Badra, 2008).  The best time to spot the Eastern flat-whorl is cool days after a rainstorm. They do not like to be out on dry hot summer days. Often they can be found with other types of snails and slugs (Badra, 2008).