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Muggiaea atlantica
''Muggiaea atlantica'' is a species of small hydrozoan jellyfish, a siphonophore in the family Diphyidae. It is a cosmopolitan species occurring in inshore waters of many of the world's oceans, and it has colonised new areas such as the North Sea and the Adriatic Sea. It is subject to large population swings, and has been held responsible for the death of farmed salmon in Norway. The species was first described by J.T. Cunningham in 1892 from a specimen obtained at Plymouth, England.
==Description==
''Muggiaea atlantica'' is a small colonial siphonophore, but one of the two nectophores (swimming bells) is undeveloped. The remaining nectophore grows to a length of about . It is translucent and has five straight, longitudinal ridges, some of which may form a keel. The hydroecium (ventral cavity) is about one third of the length of the nectophore, and the long slender somatocyst (extension of the gastrovascular system) reaches the apex of the nectosac (central cavity) and sometimes contains oil droplets. The eudoxid (reproductive stage) soon becomes detached. It has a cone-shaped, asymmetric bract with a wide flanged suture running from apex to base. The right edge of the bract is curved while the left edge is truncated horizontally. The lower surface has a small cavity in which the somatocyst is situated.
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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