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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.
In cnidarians, the gastrovascular system is also known as the coelenteron, and is commonly known as a "blind gut" or "blind sac", since food enters and waste exits through the same orifice. The radially symmetrical cnidarians have a sac-like body in two distinct layers, the epidermis and gastrodermis , with a jellylike layer called the mesoglea ...
Humans make use of many other animal species for food (including meat, eggs, and dairy products), ... catching small prey with its nematocysts as modern cnidarians do.
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.
Although they have large amounts of venom deadly to their prey, their stings and venom are not harmful to humans. They are actually known to be eaten by humans located mostly in Japan and China. The dish is a delicacy in the Japanese and Chinese cultures. This particular species of jellyfish is used also used for medicinal purposes for humans. [8]
The man o' war is described as a colonial organism because the individual zooids in a colony are evolutionarily derived from either polyps or medusae, [15] i.e. the two basic body plans of cnidarians. [16] Both of these body plans comprise entire individuals in non-colonial cnidarians (for example, a jellyfish is a medusa, while a sea anemone ...
Increased habitat and task complexity has favored the high-resolution visual systems common in derived cnidarians such as box jellyfish. [40] Basal visual systems observed in various cnidarians exhibit photosensitivity representative of a single task or behavior. Extraocular photoreception (a form of non-directional photoreception), is the most ...
Although freshwater is an unusual habitat for cnidarians, it is not unheard of, especially within hydrozoans. [2] For instance, the model organism Hydra and the jellyfish Craspedacusta sowerbii are both exclusively freshwater hydrozoans. [2] Hydra and Craspedacusta sowerbii are distantly related and are not closely related to Polypodium.