clade Euthyneura clade Nudipleura clade Nudibranchia clade Euctenidiacea Sea lemon is a loosely-applied common name for a group of medium-sized to large shell-less colorful sea slugs or nudibranchs, specifically dorid nudibranchs in the taxonomic family Dorididae and other closely related families. These are marine gastropod mollusks. The Monterey...