Belongs within: Heterobranchia.Contains: Succineinae. The Succineoidei are a group of terrestrial molluscs whose members have optic tentacles that retract that do not invert, and elasmognathous jaws with lateral winged processes and a greatly enlarged attachment plate. The cosmopolitan Succineidae are thin-shelled, conical snails with a greatly enlarged aperture and strongly impressed sutures. Apical whorls have… Continue reading Succineoidei