clade Euthyneuraclade Panpulmonata clade Eupulmonata clade Stylommatophora Megapallifera mutabilis, common name the changeable mantleslug, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusk in the family Philomycidae.

It eats primarily algae, and lives in live trees such as American beech.

The species is native to eastern North America.

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