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  2. Hydra (genus) - Wikipedia

    en.wikipedia.org/wiki/Hydra_(genus)

    Hydra (/ ˈ h aɪ d r ə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.They are native to the temperate and tropical regions. [2] [3] The genus was named by Linnaeus in 1758 after the Hydra, which was the many-headed beast of myth defeated by Heracles, as when the animal has a part severed, it will regenerate much like the mythical hydra's heads.

  3. Hydra vulgaris - Wikipedia

    en.wikipedia.org/wiki/Hydra_vulgaris

    Hydra vulgaris, the fresh-water polyp, [3] is a small freshwater hydroid with length from 10 mm to 30 mm and width about 1 mm. [4] Description.

  4. Hydra viridissima - Wikipedia

    en.wikipedia.org/wiki/Hydra_viridissima

    Hydra viridissima is a species of cnidarian which is commonly found in still or slow-moving freshwater [2] in the Northern temperate zone. Hydra viridissima is commonly called green hydra due to its coloration, which is due to the symbiotic green algae Chlorella vulgaris which live within its body. [ 3 ]

  5. Hydrozoa - Wikipedia

    en.wikipedia.org/wiki/Hydrozoa

    Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water' and ζῷον (zôion) 'animal') is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water.

  6. Polyp (zoology) - Wikipedia

    en.wikipedia.org/wiki/Polyp_(zoology)

    Anatomy of a coral polyp. The body of the polyp may be roughly compared in a structure to a sac, the wall of which is composed of two layers of cells. The outer layer is known technically as the ectoderm, the inner layer as the endoderm (or gastroderm).

  7. Hydra oligactis - Wikipedia

    en.wikipedia.org/wiki/Hydra_oligactis

    Hydra oligactis, also known as the brown hydra, is a species of hydra found widely dispersed in the northern temperate zone. It is a common organism found in still waters from early Spring to late Autumn. It is commonly found attached to the stems of water plants, the undersides of leaves, submerged twigs and on the surface of stones. When ...

  8. Sea anemone - Wikipedia

    en.wikipedia.org/wiki/Sea_anemone

    As cnidarians, sea anemones are related to corals, jellyfish, tube-dwelling anemones, and Hydra. Unlike jellyfish, sea anemones do not have a medusa stage in their life cycle. A typical sea anemone is a single polyp attached to a hard surface by its base, but some species live in soft sediment, and a few float near the surface of the water.

  9. Coelenterata - Wikipedia

    en.wikipedia.org/wiki/Coelenterata

    Coelenterata is a term encompassing the animal phyla Cnidaria (coral animals, true jellies, sea anemones, sea pens, and their relatives) and Ctenophora (comb jellies). The name comes from Ancient Greek κοῖλος (koîlos) 'hollow' and ἔντερον (énteron) 'intestine', referring to the hollow body cavity common to these two phyla.

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