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Coelenterates, also known as Cnidarians (alternate phylum name) are a phylum of marine invertebrates.

They are divided into 4 major classes:

Anthozoa Hydrozoa Scyphozoa Cubozoa
Coral & sea anemones Hydroids, Portuguese Man-o-War Jellyfishes Box Jellyfish

Most Coelenterates obtain prey by catching small planktonic creatures with nematocysts located in their tentacles.