Cnidaria

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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.

“atlantic sea nettles 🤍”

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.

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