A member of the order Notaspidea ("sidegill slugs"), this sea slug may grow up to several inches in length. They have a large plume-like gill located between the mantle and foot on the side of their body.

Members of the genus Pleurobranchaea are known to feed on large prey, including fish. As a defense mechanism, the "sidegill slugs" usually secrete sulfuric acid.

Identification: Pleurobranchus grandis

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