Medusa

Jellyfish (also known as jellies or sea jellies) are free-swimming members of the phylum Cnidaria. They have several different morphologies that represent several different cnidarian classes including the Scyphozoa (over 200 species), Staurozoa (about 50 species), Cubozoa (about 20 species), and Hydrozoa (about 1000-1500 species that make jellyfish and many more that do not). The jellyfish in these groups are also called, respectively, scyphomedusae, stauromedusae, cubomedusae, and hydromedusae; medusa is another word for jellyfish.

Jellyfish

 Jellyfish

by Alexander Semenov

Russian biologist Alexander Semenov graduated in 2007 from Moscow State University’s zoology department where he studied invertebrate animals. Specifically: squid brains. Now he works as the chief of his diving team at the White Sea Biological Station, camera always in-hand

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Pelagia noctiluca
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