Jay, Blue
 Any planktonic marine member of the class Scyphozoa (phylum Cnidaria), a group of invertebrate animals composed of about 
200 described species, or of the class Cubozoa (20 species). The term is
 also frequently applied to certain other cnidarians (such as members of
 the class Hydrozoa) that have a medusoid (bell- or saucer-shaped) body 
form, as, for example, the hydromedusae and the siphonophores (including
 the Portuguese man-of-war). 


 
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