Cnidaria - Wikipedia Cnidarians are a very ancient phylum, with fossils having been found in rocks formed about 580 million years ago during the Ediacaran period, preceding the Cambrian Explosion Other fossils show that corals may have been present shortly before 490 million years ago and diversified a few million years later
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
Cnidarians - Examples, Characteristics, Reproduction, Lifecycle Cnidarians are diploblastic organisms, with their body cells organized in two distinct germinal layers, the ectoderm and endoderm These cells are bound by intercellular connections and rest on carpet-like basement membranes
Phylum Cnidaria | manoa. hawaii. edu ExploringOurFluidEarth The phylum Cnidaria (pronounced “nih DARE ee uh”) includes soft-bodied stinging animals such as corals, sea anemones, and jellyfish (Fig 3 23 A) The phylum’s name is derived from the Greek root word cnid - meaning nettle, a stinging plant Cnidarians are found in many aquatic environments
Cnidaria (corals, sea anemones, jellyfish, and relatives . . . - ADW The Phylum Cnidaria includes such diverse forms as jellyfish, hydra, sea anemones, and corals Cnidarians are radially or biradially symmetric, a general type of symmetry believed primitive for eumetazoans
Introduction to Cnidaria Cnidarians are incredibly diverse in form, as evidenced by colonial siphonophores, massive medusae and corals, feathery hydroids, and box jellies with complex eyes Yet, these diverse animals are all armed with stinging cells called nematocysts
Cnidarians ~ MarineBio Conservation Society Cnidarians are a diverse group of animals that belong to the phylum Cnidaria They are characterized by the presence of specialized stinging cells called cnidocytes, which are used for defense and capturing prey Cnidarians exhibit a wide range of body forms, including polyps, medusae, and colonies
Cnidaria - New World Encyclopedia Cnidaria (pronounced with a silent c) is a phylum containing some 11,000 species of relatively simple invertebrate animals found exclusively in aquatic, mostly marine, environments
Phylum Cnidaria – General characteristics and classification Cnidaria is a phylum within the Kingdom Animalia that contains 10,000 known species, including corals, sea anemones, jellyfishes, and hydras These organisms are found in both marine and freshwater environments
28. 2A: Phylum Cnidaria - Biology LibreTexts Phylum Cnidaria includes animals that show radial or biradial symmetry and are diploblastic: they develop from two embryonic layers Nearly all (about 99 percent) cnidarians are marine species