Swimming medusae and sessile polyps, both of which are radially symmetrical with mouths surrounded by tentacles that bear cnidocytes, which are specialized stinging cells used to capture prey. Cnidarian, any member of the phylum cnidaria (coelenterata), a group made up of more than 9,000 living species What are cnidarians with types, examples, & habitat How do they eat, move, and reproduce Also, know their body symmetry, lifecycle, and organ system with pictures. If collar cells and spicules are defining characteristics of the phylum porifera, then nematocysts define cnidarians
These tiny organelles, likened by hickman to cocked guns, are both highly efficient devices for capturing prey and extremely effective deterrents to predators. 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. Cnidarians all have a simple body with a mouth and tentacles for feeding Some cnidarians can swim like jellyfish, while others, like corals, are fixed to one spot
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. Nearly all (about 99 percent) cnidarians are marine species The defining cell type for the cnidarians is the cnidocyte, or stinging cell These cells are located around the mouth and on the tentacles, and serve to capture prey or repel predators. Cnidaria, is a phylum under kingdom animalia containing over 11,000 species of aquatic animals found both in freshwater and marine environments (predominantly the latter), including jellyfish, hydroids, sea anemones, corals and some of the smallest marine parasites.
Cnidarians have a unique feature Greek root word cyst meaning bag).
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