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 30 millimetres (1.2 inches) long but is capable of great contraction.
- 1 What does hydra mean in biology?
- 2 What is hydra also known as?
- 3 What is the role of hydra?
- 4 What type of reproduction is hydra?
- 5 Is hydra a unicellular organism?
- 6 Are hydra microorganisms?
- 7 Is a hydra a jellyfish?
- 8 How do hydra eat?
- 9 What causes hydra?
- 10 Is hydra a fungi?
- 11 Where are hydras found?
- 12 Is Hydra colonial or solitary?
What does hydra mean in biology?
Hydra. (Science: organism) genus of freshwater coelenterates (cnidarians). They are small, solitary and only exist in the polyp form, which is a radially symmetrical cylinder that is attached to the substratum at one end and has a mouth surrounded by tentacles at the other.
What is hydra also known as?
By The Editors of Encyclopaedia Britannica | View Edit History. Hydra, also called the Lernean Hydra, in Greek legend, the offspring of Typhon and Echidna (according to the early Greek poet Hesiod’s Theogony), a gigantic water-snake-like monster with nine heads (the number varies), one of which was immortal.
What is the role of hydra?
Ecologically, Hydra play the role of both predators and prey in aquatic ecosystems (Slobodkin and Bossert, 2001). Hydra are ecologically important and play an important role in structuring the planktonic make-up of ponds (Schwartzet al., 1983) and are therefore a valuable indicator species in ecotoxicology.
What type of reproduction is hydra?
The usual mode of asexual reproduction in Hydra is by bud production, whereby the genetically identical offspring are dependent on their parent until detachment after about 3-4 days growth. Hydras also reproduce sexually, with some spe- cies being hermaphroditic and other gonochoric.
Is hydra a unicellular organism?
Hydra is a multicellular eukaryotic organism which belongs to the phylum Coelenterata. They are multicellular and, owing to the stem-like and leaf-like structures, superficially resemble land plants.
Are hydra microorganisms?
Genus: Hydra – A polyp-like organism with a tubular body. Hydra are a large genus of microorganisms that have many distinguishing characteristics. It’s important to note that hydra are one of the few freshwater aquatic organisms in their lineage.
Is a hydra a jellyfish?
Unfortunately, sometimes swimmers can accidentally come into contact with a jellyfish. In most cases, the sting from their tentacles is painful to humans, but not fatal. The last group of cnidarians is the Hydrozoans, which includes the hydra.
How do hydra eat?
Hydra capture their food by paralyzing and killing the food organism by means of nematocysts, which are discharged into the prey. The prey is brought to the mouth (proctostome) by the tentacles, a response that is induced glutathione. The organism is then taken in through the mouth, which is star-shaped or circular.
What causes hydra?
It’s possible that the hydra hitchhiked from aquarium decorations, aquatic plants, rocks, or driftwood that came from an infected tank. Hydra can also be introduced if you collect live foods, plants, or hardscape from the wild.
Is hydra a fungi?
Hydra are a genus of small, fresh-water organisms that are classified under the phylum Cnidaria. viridissima is due to the presence of zoochlorellae, an algae that lives in symbiosis with the hydra.
Where are hydras found?
Hydras occur in freshwater, either in flowing or standing waters. They tolerate a wide range of conditions from depths up to 350 metres in lakes, or in shallow, fast-flowing streams. They attach themselves to solid surfaces such as stones, twigs, or vegetation. They do not occur on soft surfaces.
Is Hydra colonial or solitary?
Hydra is an unusual hydrozoan genus in that its life cycle lacks any trace of a jellyfish stage, and the polyp stage is solitary rather than colonial.