While bilaterian animals have a distinct front, back, top, and bottom, non-bilaterian organisms lack that symmetry. Non-bilaterian animals include sponges, jellyfish, corals, comb jellies, sea anemones, and placazoa (simple, free-floating multicellular marine organisms). This group split from bilaterians early in animal evolution.
Meet the Members of the Non-Bilaterian Division
Explore the Other Divisions
What is March Madness?
Based on the March Madness NCAA basketball tournament, during March Madness, popular organisms face off for your votes. YOU have the opportunity to decide what organism is crowned victorious by voting for your favorite organisms in a series of head-to-head match-ups. Voting will take place on the social media channels.