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Tree depicting hypothesized evolutionary relationships among the groups included in this book. Based on Dunn et al. (2008) and the Tree of Life Web Project (tolweb.org).
Vertebrates, which are not covered by this book, consist of: Mammals, Amphibians, Reptiles, Birds, and Fishes.
*Bristle Worms (Polychaetes) Include:
Lugworms, Bamboo Worms, Parchment Worms, Limy Tube Worms, Feather Duster Worms, Mason Worms, Mud Worms, Trumpet Worms, Clam Worms, Shingle Tube Worms, Plumed Worms, Soda Straw Worms, Thread Worms…

**True Bugs (Hemipterans) Include:
Water Striders, Water Treaders, Velvet Water Bugs; Giant Water Bugs, Waterscorpions, Water Boatmen, Water Measurers, Backswimmers, Creeping Water Bugs, Toad Bugs; Shore Bugs; Assassin Bugs, Plant Bugs, Damsel Bugs, Lace Bugs, Bed Bugs; Stink Bugs, Seed Bugs, Leaf-Footed Bugs, Stilt Bugs…