Subkingdom Eumetazoa (all the other phyla) - The Eumetazoa consist of all the other animal phyla. Subkingdom Eumetazoa (all the other phyla) - The Eumetazoa consist of all the other animal phyla. The Radiata-Bilateria Split The Radiata-Bilateria Split Branch Radiata Branch Radiata The phyla in this branch have radial symmetry. The phyla in this branch have radial symmetry. These animals have an oral (top) and aboral (bottom) side, but no front, back, left or right sides. These animals have an oral (top) and aboral (bottom) side, but no front, back, left or right sides. This branch includes the phylum Cnidaria, (the jellyfish, sea anemonies, and corals). This branch includes the phylum Cnidaria, (the jellyfish, sea anemonies, and corals).

The Radiata-Bilateria Split

Branch Bilateria The phyla in this branch have bilateral symmetry. The phyla in this branch have bilateral symmetry. Bilaterally symmetrical animals have dorsal (top), ventral (bottom), anterior (head), posterior (tail), left and right body surfaces. These animals exhibit cephalization (an evolutionary trend toward concentration of sensory structures at the anterior end). This branch includes all other animal phyla. Bilaterally symmetrical animals have dorsal (top), ventral (bottom), anterior (head), posterior (tail), left and right body surfaces. These animals exhibit cephalization (an evolutionary trend toward concentration of sensory structures at the anterior end). This branch includes all other animal phyla. Care must be taken when assigning an animal to an evolutionary line. Some such as the Phylum Echinodermata, show secondary radial symmetry which evolved as an adaptation to their lifestyle Care must be taken when assigning an animal to an evolutionary line. Some such as the Phylum Echinodermata, show secondary radial symmetry which evolved as an adaptation to their lifestyle