Search results
Results From The WOW.Com Content Network
Some Hydra species, like Hydra circumcincta and Hydra viridissima, are hermaphrodites [12] and may produce both testes and ovaries at the same time. Many members of the Hydrozoa go through a body change from a polyp to an adult form called a medusa , which is usually the life stage where sexual reproduction occurs, but Hydra do not progress ...
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 ]
Pacific sea nettles, Chrysaora fuscescens. Cnidaria (/ n ɪ ˈ d ɛər i ə, n aɪ-/ nih-DAIR-ee-ə, NY-) [4] is a phylum under kingdom Animalia containing over 11,000 species [5] of aquatic invertebrates found both in fresh water and marine environments (predominantly the latter), including jellyfish, hydroids, sea anemones, corals and some of the smallest marine parasites.
Although there are freshwater species, the great majority are marine (salt water) species, ranging from tidal zones to depths exceeding 8,800 m (5.5 mi). While most of the approximately 5,000–10,000 known species feed on bacteria and other food particles in the water, some host photosynthesizing micro-organisms as endosymbionts and these ...
Hydra and Craspedacusta sowerbii are distantly related and are not closely related to Polypodium. Also, the obligate parasite Myxobolus cerebralis lives in freshwater. Thus, it appears that in the evolution of cnidarians, invasion of freshwater habitats has happened at least three separate times.
Siphonophorae (from Greek siphōn 'tube' + pherein 'to bear' [2]) is an order within Hydrozoa, which is a class of marine organisms within the phylum Cnidaria.According to the World Register of Marine Species, the order contains 175 species described thus far.
Anthozoa is a class of marine invertebrates which includes sessile cnidarians such as the sea anemones, stony corals, soft corals and sea pens.Adult anthozoans are almost all attached to the seabed, while their larvae can disperse as planktons.
Two branches from the tree-like colony are shown, with a feeding hydra (A) the tip of each twig. Buds at the base of the hydra (at B) eventually detach and grow into adult jellyfish (K) Scientific classification; Domain: Eukaryota: Kingdom: Animalia: Phylum: Cnidaria: Class: Hydrozoa: Order: Anthoathecata: Suborder: Filifera: Family: Oceaniidae