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Hydrozoa (hydrozoans) are a taxonomic class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater. A few genera within this class live in freshwater. Hydrozoans are related to jellyfish and corals and belong to the phylum Cnidaria.

Hydrozoa Encrusting a Small Shell

Hydrozoa (hydrozoans) are a taxonomic class of very small, predatory animals which can be solitary or…

An perpendicular section of a sea anemone. Sea anemones are a group of water dwelling, predatory animals of the order Actiniaria; they are named after the anemone, a terrestrial flower. As cnidarians, sea anemones are closely related to corals, jellyfish, tube-dwelling anemones, and Hydra.

Perpendicular Section of a Sea Anemone

An perpendicular section of a sea anemone. Sea anemones are a group of water dwelling, predatory animals…