1. Classify living invertebrates into different phyla
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2. Classification? Animals with backbones One phylum: chordates
Vertebrates
Animals
Animals with backbones
One phylum: chordates
Animals without backbones
8 phyla
Invertebrates
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3. Invertebrate Phyla Sponges Cnidarians Platyhelminthes Nematodes
Family
Order
Class
Phylum
Kingdom
Sponges
Cnidarians
Platyhelminthes
Nematodes
Mollusks
Annelids
Echinoderms
Arthropods
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4. Sponges (Porifera) Most primitive Cells relatively independent
Mostly marine
No Symmetry
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5. Cnidarians
Mostly marine
Radial Symmetry
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6. Cnidarians Jellyfish Hydra Coral Sea anemone Portuguese Man-O-War
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7. Platyhelminthes
Flatworms
Bilateral symmetry
Cephalization
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8. Planarian – freshwater flatworm
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9. Nematods Tube-like digestive tract Roundworms! Mouth and anus
No segmentation
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10. Mollusks Clams, snails, squids Varied habitats Marine Freshwater
Terretrial
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11. Annelids
Segmented worms
Common earthworm
Leech
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12. Echinoderms Always marine Starfishes, sea urchins, sea lilies
Spiny skin
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13. Brittle Star – An Echinoderm
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14. Arthropods Joint-legged animals External skeleton
Huge variation – mostly insects
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15. Section Review (cont.) 14 invertebrates 15 ectoderm 16 sponges
17 endoderm
18 coelom
19 Cnidarian
20 segmented
21 echinoderms
22 Crustacea
23 sea squirts 24 25
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16. Classify living invertebrates into different phyla
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