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Hydra has a tubular, radially symmetric body up to 10 mm (0.39 in) long when extended, secured by a simple adhesive foot known as the basal disc. Gland cells in the basal disc secrete a sticky fluid that accounts for its adhesive properties.
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 ]
Like other hydras, Hydra vulgaris cling to a base object with a "foot" pad, shaped like a disk. The Hydra moves by releasing its grip on its base and is carried away by the current. H. vulgaris can also move by bending over, grabbing a surface with its tentacles, releasing its grip with its "foot" and flipping over itself.
Siphonophores of the deep-sea genus Erenna (found at depths between 1,600–2,300 metres or 5,200–7,500 feet) are thought to use their bioluminescent capability for offense too, as a lure to attract fish. [8] This genus is one of the few to prey on fish rather than crustaceans. [8]
Tank size Tank size Temperature range pH range Water Hardness Harlequin rasbora: Trigonostigma heteromorpha: 5 cm (2.0 in) Also known as Harlequin tetra or Harlequin barb. Glowlight rasbora: Trigonostigma hengeli: 5 cm (2.0 in) Red-striped rasbora: Trigonopoma pauciperforata: 7.5 cm (3.0 in) 22–29 °C (72–84 °F) Trigonopoma gracile: 5.5 cm ...
The shape and dimensions of the proboscis have evolved to give different species a wider and, therefore, more advantageous diet. [3] There is an allometric scaling relationship between body mass of Lepidoptera and length of proboscis [ 22 ] from which an interesting adaptive departure is the unusually long-tongued sphinx moth Xanthopan morganii ...
Requires a minimum 825 gallon aquarium with a 7 cm (2.7 in) deep sand bed and no rockwork. May live for 8 to 10 years in an aquarium. [70] 119 cm (46.9 in) [104] Atlantic guitarfish: Pseudobatos lentiginosus: No: Requires a minimum 200 gallon aquarium preferably with no aquascaping. Uncommon in the aquarium trade. [70] 76 cm (29.9 in) [105]
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 ...