Some of these organisms possess ptychocysts (TIKE-oh-sists), which help to create the tube in which they live. This phylum is characterized by the presence of nematocysts, which are (*) poison-injecting organelles. This phylum's body plan includes a jelly-like middle layer called the mesoglea, and its two body forms are the polyp, like sea anemones, and medusa, like the Portuguese man-of-war. For 10 points, name this phylum that includes corals and jellyfish, named for its stinging cells.
Some of these organisms possess ptychocysts (TIKE-oh-sists), which help to create the tube in which they live. This phylum is characterized by the presence of nematocysts, which are (*) poison-injecting organelles. This phylum's body plan includes a jelly-like middle layer called the mesoglea, and its two body forms are the polyp, like sea anemones, and medusa, like the Portuguese man-of-war. For 10 points, name this phylum that includes corals and jellyfish, named for its stinging cells.
Some of these organisms possess ptychocysts (TIKE-oh-sists), which help to create the tube in which they live.
Cnidaria