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Corals, sea anemones and jellyfish are the most familiar of the cnidarians. Two lesser-known groups are tiny moss-like creatures called hydroids and the ocean-going siphonophores. Siphonophores are colonies of highly specialised individuals.

Throughout their lifecycle, jellyfish take on two different body forms: medusa and polyps. Polyps can reproduce asexually by budding, while...

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Phylum Cnidaria (formely known as coelenterata) includes about 9000 species.Some are found in fresh water, but the grater number are marine. Coelenterates (Gr. koilos, hollow+enteron,gut).are the simplest of eumetazoans. This interesting group of animals take its name from the large cavity in the body that serves as the intestine.They include the hydra, jellyfish, sea anemones and corals.

Cnidaira Staurozoa -Stalked Jellyfish Stauromedusae are the stalked jellyfishes. They are the sole living members of the class Staurozoa, and belong to the medusozoa subphylum of Cnidaria. These little stalked jellyfishes that spend their entire life attached to the substrate (rock or algae, usually), rather than swimming freely up in the water column like most other jellyfish.