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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 oligactis. This species can reproduce in three ways: sexual reproduction, budding, and indirectly through regeneration. [11] When hydra reproduce sexually, simple testes, ovaries, or both will develop on the bodies of an individual. Sperm released into the environment by the testes enters the egg within the ovary.
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Hydra generally refers to: Lernaean Hydra , a many-headed serpent in Greek mythology Hydra (genus) , a genus of simple freshwater animals belonging to the phylum Cnidaria
Leonardo Helicopters in the UK will maintain the current fleet of Apaches until 2023–2024, with a long-term plan for Leonardo and other UK companies to "do most of the work" on the new fleet. [192] The deal included an initial support contract for maintenance, spare parts, and training simulators; components from the older WAH-64s "will be ...
The Hydra 70 rocket is an American made 2.75-inch (70 mm) diameter fin-stabilized unguided rocket used primarily in the air-to-ground role. It can be equipped with a variety of warheads, and in more recent versions, guidance systems for point attacks.
[4] [5] Among Euhirudinea, the true leeches, the smallest is about 1 cm (1 ⁄ 2 in) long, and the largest is the giant Amazonian leech, Haementeria ghilianii, which can reach 30 cm (12 in). Except for Antarctica, [ 4 ] leeches are found throughout the world but are at their most abundant in temperate lakes and ponds in the northern hemisphere.