InvertebratesGoal: Students will know the 8 invertebrate phyla

What is an invertebrate?  An animal that does not have a backbone  Plural of phylum  The group below kingdom What is phyla?

Sponges (Porifera)

 Asymmetrical  Lives in water  Filter their food out of water

Cnidarians (Cnidaria)

 Radial symmetry  Reproduce sexually and asexually  Catch food using stinging cells  Example: Jellyfish, Sea anemone

Flatworms (Platyhelminthes)

 Bilateral symmetry  Most are parasites  Flat body  Simplest organism with a brain  Examples: Planarian, Tapeworm

Roundworms (Nematoda)

 Bilateral symmetry  Most are parasites  round body  One-way digestive system  Example: Guinea worm

Segmented Worms (Annelida)

 Bilateral symmetry  round body divided into segments  Closed circulatory system  Ex: earthworm

Mollusks (Mollusca)

 Bilateral symmetry  Soft bodied  open circulatory system  Ex: squid, snail, octopus

Arthropods (Arthropoda)

 Bilateral symmetry  exoskeleton  Segmented bodies  Subgroups:  Arachnids  Insects  Crustaceans  Centipedes  Millipedes

Echinoderms (Echinoderma)

 Radial symmetry  Endoskeleton  Water vascular system  Ex: sea star, sea urchin