Webno stinging cells; instead have adhesive cells (=colloblasts) for getting food chief identifying feature is 8 rows of comb plates of cilia extend from mouth to aboral end … Webstinging cells, aid in capture of prey and defense. Inside have a nematocyst. Nematocyst. the actual stinging structure, acts like a harpoon. Operculum. acts like a door to the nematocyst with the cnidocil acting as the trigger. ...
Nitric oxide signaling in ctenophores - ScioWire Magazine
Like sponges and cnidarians, ctenophores have two main layers of cells that sandwich a middle layer of jelly-like material, which is called the mesoglea in cnidarians and ctenophores; more complex animals have three main cell layers and no intermediate jelly-like layer. See more Ctenophora comprise a phylum of marine invertebrates, commonly known as comb jellies, that inhabit sea waters worldwide. They are notable for the groups of cilia they use for swimming (commonly referred to as "combs"), and … See more Distribution Ctenophores are found in most marine environments: from polar waters to the tropics; near coasts … See more The number of known living ctenophore species is uncertain since many of those named and formally described have turned out to be identical to species known under other scientific names. Claudia Mills estimates that there about 100 to 150 valid species that are not … See more Among animal phyla, the Ctenophores are more complex than sponges, about as complex as cnidarians (jellyfish, sea anemones, … See more For a phylum with relatively few species, ctenophores have a wide range of body plans. Coastal species need to be tough enough to withstand waves and swirling sediment particles, … See more Despite their fragile, gelatinous bodies, fossils thought to represent ctenophores – apparently with no tentacles but many more comb-rows than modern forms – have been found in See more • Gelatinous zooplankton See more WebSep 23, 2024 · Cnidarians have specialized cells known as cnidocytes (“stinging cells”) containing organelles called nematocysts. These cells are concentrated around the mouth and tentacles of the animal and can immobilize prey with toxins. Nematocysts contain coiled threads that may bear barbs. cindy stearns
15.2: Sponges and Cnidarians - Biology LibreTexts
WebA cnidocyte (also known as a cnidoblast or nematocyte) is an explosive cell containing one large secretory organelle called a cnidocyst (also known as a cnida ( PL cnidae) or nematocyst) that can deliver a sting to other … WebPhylum Ctenophora The comb jellies, with many comb-like rows of cilia and biradial symmetry (like a two-armed pinwheel). Examine a ctenophore, and see how it can be distinguished from a cnidarian. Phylum Cnidaria (radially symmetrical animals with stinging cells): Class Hydrozoa Solitary or colonial cnidaria with a polyp (mouth facing upward) WebPhylum Ctenophora The comb jellies, with many comb-like rows of cilia and biradial symmetry (like a two-armed pinwheel). Examine a ctenophore, and see how it can be … cindy steckel