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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 ]
The hydra have four to twelve tentacles that protrude from just outside the mouth. They feed by extending their tentacles and waiting for food to touch the tentacles. They then bring the food to their mouth, ingest and digest the organism. Anything that cannot be digested is egested. Ingestion and egestion occur through the mouth.
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.
The relative length of the tentacles compared to the body is characteristic of the species and serves to differentiate it from any other brown Hydra of cool temperate waters. When a cold sensitive strain of H. oligactis is subjected to temperature stress, it undergoes a shift from asexual budding to sexual reproduction. [2]
The gastrozooid has a tentacle used for capturing and digesting food. [11] The groups also have gonophores, which are specialized for reproduction. [11] They use a pneumatophore, a gas-filled float, on their anterior end and drift at the surface of the water or stay afloat in the deep sea. [11]
The regional form previously known as P. utriculus has a bladder rarely exceeding 10 centimetres (4 in) in length and has one long hunting tentacle that is less than 3 metres (10 ft) long. In comparison, the typical man o' war has a float of around 15 to 30 centimetres (5.9 to 12 in), and several hunting tentacles that can reach 30 metres (100 ...
Gonionemus is a genus of hydrozoans that use adhesive discs near the middle of each tentacle to attach to eelgrass, sea lettuce, or various types of algae instead of swimming. They are small (bell diameter to 25 mm) and hard to see when hanging onto swaying seaweed. Nevertheless, they are capable of swimming when necessary.
Just prior to host spawning, Polypodium everts to the normal position of cell layers, revealing tentacles scattered along the stolon. [2] During eversion, the yolk of the host oocyte fills the gastral cavities of the parasite, supplying the future free-living stage with nutrients. [2] [8] The parasitic phase of its life cycle usually takes ...