| 1. Tissue Organization | ||
| a. distinct tissue absent | b. distinct tissue present | |
| sponge | all other groups | |
| . | ||
| 2. Symmetry | ||
| a. radial | b. bilateral | |
| cnidaria, hydra | all other groups, except sponges which have no symetry | |
| . | ||
| 3. Body Cavity | ||
| a. acoelomate | b. pseudocoelomate | c. eucoelom |
| planaria | roundworm | all other groups |
| . | ||
| 4. Openings to Digestive Tract | ||
| a. one | b. two | |
| hydra, planaria | all other groups | |
| . | ||
| 5. Circulatory System | ||
| a. none | b. open | c. closed |
| sponge, hydra, planaria, roundworm | clam, crayfish, grasshopper | earthworm, clamworm, lancetlet, pig |
| . | ||
| 6. Habitat | ||
| a. aquatic | b. terrestrial | c. parasitic |
| sponge, hydra, planaria, clam, lancelet | earthworm, grasshopper, pig | roundworm |
| 7. Gas Exchange | ||
| a. skin | b. gills | c. lungs |
| clamworm, earthworm, hydra, lancelet | clam, crayfish | pig |
| . | ||
| d. spiracles/tracheae | ||
| grasshopper | ||
| . | ||
| 8. Excretion | ||
| a. flame cells: planaria | ||
| b. nephridia: clamworm, earthworm, clam, lancelet | ||
| c. green glands: crayfish | ||
| d. Malpighian tubes: grasshopper | ||
| e. kidneys: pig | ||
| . | ||
| 9. Locomotion | ||
| a. none/limited: sponge, hydra | ||
| b. swimming: clamworm, crayfish, lancelet | ||
| c. crawling: earthworm, planaria, roundworm | ||
| d. walking: crayfish, planaria, roundworm | ||
| . | ||
| 10. Support Systems | ||
| a. external | b. internal | c. hydrostatic |
| clam, crayfish, grasshopper | lancelet | pig |
| . | ||
| 11. Segmented Body | ||
| a. no | b. yes | |
| clam, roundworm, planaria | clamworm, earthworm, crayfish, grasshopper, pig | |
| . | ||
| 12. Appendages | ||
| a. yes | b. no | |
| crayfish, grasshopper, pig, clamworm | all others | |
| . | ||
| 13. Nervous System | ||
| a. nerve net: hydra | ||
| b. ventral nerve cord: grasshopper, crayfish | ||
| c. 2 ventral: planaria | ||
| d. dorsal nerve cord: lancelet, pig | ||
| e. v. &. d. cord: roundworm | ||
| . |