IDnature guide TOL Overview Those animal groups characterized by bilateral symmetry and three distinct tissue types (endoderm, ectoderm, and mesoderm). Includes the protostomes and deuterostomes. Phylogeny Tree of Life Links to other sites Bilateria in Comparative Toxicogenomics Database Acknowledgements Ashley MacDonald, University of Georgia, Athens I thank John Pickering for his assistance with the development of this page. Supported by National Biological Information Infrastructure National Science Foundation go to Discover Life's Facebook group Updated: 2024-04-25 18:57:33 gmt Discover Life | Top © Designed by The Polistes Corporation