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Cnidarian or Colenterate
invertebrates that have stinging cells to capture food and defend themselves; stinging cells are called nematocysts; sea anemone, jellyfish, hydra, and coral
Roundworm or Nematoda
has a digestive system that is like a tube, open at both ends; round worms, hookworms
The reason sponges are first and Echinoderms are last in the invertebrate groups
Sponges are the simplest; and echinoderms are the most complex
sense organs are in the front, distinct front and back, have more organs, more efficient
Segmented Worms or Annelida
body is made up of many linked sections called segments; earthworms, leeches, bristleworms
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