AP BIOLOGY

Detailed explanation-1: -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.

Detailed explanation-2: -Cnidarians, including jellyfish and sea anemones, both detect and capture prey using stinging cells called nematocytes which fire a venom-covered barb via an unknown triggering mechanism.

Detailed explanation-3: -cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9, 000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.

Detailed explanation-4: -Animals from the phylum Cnidaria have stinging cells called cnidocytes. Cnidocytes contain large organelles called (a) nematocysts that store a coiled thread and barb.