Calliopaea is a genus of sea slugs, marine gastropod molluscs in the family Limapontiidae. These are sacoglossan sea slugs.
(Original description in French) The animal is soft and contractile, with an elongated, slug-like body. The head is little distinct and bears no tentacles, but has two very long buccal appendages. The eyes are situated on the upper middle part of the body and are set fairly far apart from one another. The mouth forms a transverse slit at the anterior extremity of the foot. The gills are composed of pear-shaped bodies arranged in longitudinal rows along each side of the back. The opening of the reproductive organs lies on the right side, beneath the first branchial lobes. The foot is narrow, pointed posteriorly, and often provided with anterior lateral expansions. There is no distinct mantle.
Species within the genus Calliopaea include: