Hydra (/ ˈhaɪdrə / HY-drə) is a genus of small freshwater hydrozoans in the phylum Cnidaria.

Hydra are a genus of small, fresh-water organisms that are classified under the phylum Cnidaria. In addition to being related to such organisms as jellyfish, they are characterized by their tiny, tube …

Feb 9, 2026 · Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). The body of such an organism consists of a thin, usually translucent tube that measures up to about …

Hydra is a fascinating genus of tiny, freshwater animals within the Phylum Cnidaria and Class Hydrozoa. These creatures are notable for their simplicity, radial symmetry, and exceptional regenerative …

Oct 1, 2010 · The polyp hydra is ubiquitous in freshwater and is highly variable, with many species names assigned to different strains. Types of hydra do fall into four morphologically recognizable …

Aug 13, 2025 · Hydra belongs to the Phylum Cnidaria and is classified under the Class Hydrozoa. This places Hydra within a broad group that includes other aquatic animals like jellyfish, corals, and sea …

Hydra (/ ˈhaɪdrə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.

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Hydras are classified under the phylum Cnidaria and the class Hydrozoa. Examples of Cnidarians include jellyfish, sea anemones, corals, and hydras. They all share a feature: “using stinging cells to …