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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.
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] These creatures are typically 10 mm long and have tentacles that are about half of their length. [ 4 ]
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.
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 ...
The Hydra, a fictional deity created by Henry Kuttner. Mother Hydra, the co-ruler of the Deep One race in the Cthulhu Mythos; The Hydra, a fictional fighter jet in Grand Theft Auto: San Andreas and Grand Theft Auto Online; The Hydra, a fictional machine in Kirby Air Ride; Hydra, a boss enemy in the video game Prototype 2
Zeta Hydrae (ζ Hya, ζ Hydrae) is a solitary star in the equatorial constellation of Hydra. This is a generally faint constellation, so, at an apparent visual magnitude of +3.10, [2] this is the third-brightest member after Alphard and Gamma Hydrae.
While many of the world's wealthiest people have earned their riches in drastically different ways, they all share 10 traits.
Theta Hydrae, Latinized from θ Hydrae, is a binary star [8] system in the constellation Hydra.It is visible to the naked eye with an apparent visual magnitude of 3.9. [2] The star system has a high proper motion [8] with an annual parallax shift of 28.4 mas, [1] indicating a distance of about 115 light years.