Jellyfish
Jellyfish, 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). Unrelated forms such ascomb jellies
(phylum Ctenophora) and salps (phylum Chordata) are also referred to as
jellyfish. Scyphozoan jellyfish can be divided into two types, those
that are free-swimming medusae and those that are sessile (i.e., stem
animals that are attached to seaweed and other objects by a stalk). The
sessile polyplike forms constitute the order Stauromedusae.
Jellyfish
Jellyfish
Jellyfish
Jellyfish
Jellyfish
Jellyfish
Jellyfish
Jellyfish
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