Like flatworms and roundworms, annelids are bilaterally symmetrical and have three tissue layers. However, the tissue layers are organized differently in each of the three groups of worms (Figure 23.16). ... The body cavity of annelids (as well as many other animals you will read about later) is called a
Do worms have tissues?
All worms also have tissues, organs, and organ systems. Worms have bilateral symmetry. Unlike sponges or cnidarians, worms have distinct head and tail ends.
Do annelids have a body cavity?
Nearly all annelids have a fluid-filled cavity between the outer body wall and the gut, and this is referred to as a coelom (Figure 1). ... In other annelids there may only be a few septa dividing the coelom.
