8 Invertebrate Phyla
For 6th graders, by 6th graders
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Mollusca
Gastropods
Bivalves
Cephalopods
Arthropoda
Insecta
Crustaceans
Myriapods
Arachnids
Porifera
Echinodermata
Cnidarians
Annelida
Platyhelminthes
Nematoda
Arachnids
Arachnids are a group of arthropods. They have bilateral symmetry and exoskeletons which make them molt to grow. Also for digestion they have two openings, the mouth and anus. Arachnids reproduce sexually.
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