Pleurobranchida
Pleurobranchida are the side-gilled slugs: soft-bodied, mostly nocturnal heterobranchs with a single feathery gill on the right side, tucked under the edge of the mantle. Many keep a small internal shell. They feed mainly on sponges and ascidians and defend themselves with acidic secretions from glands in the skin.
An oval, often domed body with a large mantle covering most of the foot; rolled, tube-like rhinophores; a broad oral veil; and one plume-like gill visible on the right side between mantle and foot. There are no dorsal gills or cerata.
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