Pterotracheidae

Pterotracheidae is a family of medium-sized to large floating sea snails, pelagic gastropod molluscs. They are in the superfamily Pterotracheoidea along with two other similar pelagic families, the Atlantidae and the Carinariidae.

species of mollusc

species of mollusc

Pterotrachea is a taxonomic genus of medium-sized to large floating sea slugs, marine pelagic gastropod molluscs in the family Pterotracheidae, which is in the infraorder Littorinimorpha. As such they are quite closely related to such families as the tritons (Ranellidae) and the tun shells (Tonnidae).