Appearance

    Helisoma pilsbryi has a concavely inverted portion of shell. Their shell is also wide and bowl-like (Burch 1982). It is large, and sinistral with a few rounded whorls, with these whorls rapidly increase in size. They also have a bell-shaped aperture (Baker 1945). They are usually identified by their large, thick shell, and deep umbilicus (Courteanu 2004). This species is yellow or brown and flecked with white. They have specs of color near their eyes and tentacles (Baker 1945).

                     Three views of Planorbella trivolvis which are very similar to Planorbella pilsbryi.

    Planorbella pilsbryi is not taxonomically distinct from P. trivolvis (Burch 1982).


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