cnidaria

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Hydra is a genus of small, fresh-water animals of phylum Cnidaria and class Hydrozoa Royalty Free Stock Photo

3D rendering Hydra is a genus of small fresh-water animals of the phylum Cnidaria and class Hydrozoa Royalty Free Stock Photo

Hydra is of the phylum Cnidaria and class Hydrozoa of small fresh-water animals. 3D Illustration Royalty Free Stock Photo

A surreal scene featuring luminescent jellyfish (Cnidaria) floating above a mist- Royalty Free Stock Photo

Hydra is a genus of small, fresh-water animals of the phylum Cnidaria and class Hydrozoa. Royalty Free Stock Photo

Jellyfish swimming in the shallow sea, a type of invertebrate marine animal belonging to the phylum Cnidaria Royalty Free Stock Photo

(Amphiprioninae), seahorses (Hippocampus), and jellyfish (Cnidaria) Royalty Free Stock Photo

A digitally rendered image of a glowing jellyfish (Cnidaria), Royalty Free Stock Photo

A digital artwork of a jellyfish (Cnidaria) against a dark Royalty Free Stock Photo

Cnidaria is one of the more primitive animal phyla. It includes aquatic organisms such as jellyfish, sea anemones, corals, and hydras. Most cnidarians are marine, although a few, such as the well-known hydra, are freshwater species.