Pseudosuccinea columella (Say, 1817) Mimic Lymnaea

    A pulmonate snail leading an amphibious lifestyle.  The short triangular tentacles lacking eyespots contrast starkly with those of Succinea, which has long, slender, retractable eyestalks bearing an eyespot at their tips but has an almost identical shell.  These two snails are only remotely related - belonging to different suborders, Basommatophora and Stylommatophora respectively.

Pseudosuccinea columella (Say, 1817) Mimic Lymnaea

Pseudosuccinea columella (Say, 1817) Mimic Lymnaea

On vegetation, Lake Oneida, University of North Florida, Jacksonville, Duval Co., Florida 3/28/2005 (about 7 mm.)

Pseudosuccinea columella (Say, 1817) Mimic Lymnaea

Urban roadside drainage ditch on Touchton Road, southeastern Jacksonville, Duval Co., Florida, 1/27/2010 (about 15 mm.)

Pseudosuccinea columella (Say, 1817) Mimic Lymnaea Egg Mass
    During its time in captivity the Touchton Road specimen, or one about a dozen other specimens of which it shared aquarium space, deposited the egg mass shown above. The egg mass measured about 20 mm. and was one of four that were present.