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  • Cnidarian | Definition, Life Cycle, Classes, Facts | Britannica
    Cnidarian, any member of the phylum Cnidaria (Coelenterata), a group of more than 9,000 species of mostly marine animals The group includes corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans Learn more about cnidarians in this article
  • Cnidarian - Polyp, Medusa, Tentacles | Britannica
    Cnidarian - Polyp, Medusa, Tentacles: Cnidarians have two cell layers, ectoderm and endoderm (gastrodermis), with the mesoglea between them Medusae have a more highly developed nerve net than do polyps Respiration and excretion are carried out by individual cells Cnidae (nematocysts) are among the most complex intracellular secretion products known
  • Anatomy of cnidarians | Britannica
    cnidarian , or coelenterate , Any of about 9,000 species of mostly marine aquatic invertebrates, constituting the phylum Cnidaria (or Coelenterata), that are unique in possessing specialized stinging cells (cnidocytes) borne on the tentacles
  • Cnidarian - Symbiosis, Adaptations, Predators | Britannica
    Cnidarian - Symbiosis, Adaptations, Predators: Cnidarians are used for food, building material, and jewelry Extracts from many cnidarians have medicinal properties All the species are capable of sexual reproduction Most cnidarian species occupy marine habitats, and many have evolved unique chemical defenses that effectively deter predators
  • Cnidarian - Tentacles, Medusae, Polyps | Britannica
    Cnidarian - Tentacles, Medusae, Polyps: Cnidarians move using jet propulsion, peduncles, pedal disks, or swim by paddling their tentacles or flexing their columns All are carnivores and most use their cnidae and associated toxin to capture food Many of the complex associations cnidarians form with other organisms are mutualistic symbioses
  • Cnidarian - Radial Symmetry, Polyp Medusa | Britannica
    Cnidarian - Radial Symmetry, Polyp Medusa: The exact relationships between the cnidarian groups are unknown The oldest fossils were soft-bodied Representatives of all four modern classes have been identified in the Ediacaran fauna of the Precambrian Period Phylum Cnidaria (Coelenterata) has about 9,000 living species in four classes: Anthozoa; Cubozoa; Hydrozoa; and Scyphozoa
  • Cnidarians Portal | Britannica
    The phylum Cnidaria is made up of more than 9,000 living species, mostly marine animals Corals, jellyfish, sea anemones, and sea fans are all cnidarians
  • Nematocyst | Cnidarian, Cnidarian Venom Coelenterates | Britannica
    Nematocyst, minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e g , jellyfish, corals, sea anemones) Several such capsules occur on the body surface Each is produced by a special cell called a cnidoblast and contains a coiled, hollow, usually barbed
  • Polyp | Cnidarian, Coral Sea Anemone | Britannica
    Polyp, in zoology, one of two principal body forms occurring in members of the animal phylum Cnidaria The polyp may be solitary, as in the sea anemone, or colonial, as in coral, and is sessile (attached to a surface) The upper, or free, end of the body, which is hollow and cylindrical, typically
  • Hydroid | Characteristics Life Cycle | Britannica
    Hydroid, any member of the invertebrate class Hydrozoa (phylum Cnidaria) Most hydroids inhabit marine environments, but some hydroids have invaded freshwater habitats Hydroids may be either solitary or colonial, and there are about 3,700 known species





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