High Quality Content by WIKIPEDIA articles! Pachychilus laevisimus is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pachychilidae.Snail is a common name for almost all members of the molluscan class Gastropoda that have coiled shells in the adult stage. When the word is used in a general sense, it includes sea snails, land snails and freshwater snails. Otherwise snail-like creatures that lack a shell (or have only a very small one) are called slugs.

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