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Glaucus atlanticus
''Glaucus atlanticus'' (common names include the sea swallow, blue angel, blue glaucus, blue dragon, blue sea slug and blue ocean slug) is a species of small, blue sea slug, a pelagic aeolid nudibranch, a shell-less gastropod mollusk in the family Glaucidae.
These sea slugs are pelagic: they float upside down on the surface tension of the water, where they are carried along by the winds and ocean currents. ''Glaucus atlanticus'' is camouflaged: the blue side of their body faces upwards, blending in with the blue of the water. The silver/grey side of the sea slugs faces downwards, blending in with the silvery surface of the sea.
''Glaucus atlanticus'' feeds on other pelagic creatures, including the venomous cnidarian, the Portuguese man o' war. This sea slug stores stinging nematocysts from the cnidarian within its own tissues as defense against predation. Humans handling the slug may receive a very painful and potentially dangerous sting.
==Taxonomy==
This species looks similar to, and is closely related to, ''Glaucus marginatus'', which is now understood to be not one species, but a cryptic species complex of four separate species which live in the Indian Ocean and Pacific Ocean.〔(Churchill, C. K. C.; Valdés, Á; Ó Foighil, D. (2014). Molecular and morphological systematics of neustonic nudibranchs (Mollusca : Gastropoda : Glaucidae : Glaucus), with descriptions of three new cryptic species. Invertebrate Systematics. 28(2): 174-195. )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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