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Invertebrates & Joint-Legged Animals

Invertebrates & Joint-Legged Animals. SBI 3U October 18 th , 2012 Ms.Zafar. Invertebrates. Animal grouping No backbone Heterotrophic Why don’t they have cell walls?. We will be studying…. Phylum Mollusca Phylum Echinodermata. Phylum Mollusca. Shell Marine or terrestrial

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Invertebrates & Joint-Legged Animals

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  1. Invertebrates & Joint-Legged Animals SBI 3U October 18th, 2012 Ms.Zafar

  2. Invertebrates • Animal grouping • No backbone • Heterotrophic • Why don’t they have cell walls?

  3. We will be studying… • Phylum Mollusca • Phylum Echinodermata

  4. Phylum Mollusca • Shell • Marine or terrestrial • Annelid-like ancestors

  5. Body Plan • Foot • Mantle • Visceral Mass

  6. 3 Classes • Bivalva • Cephalopoda • Gastropoda

  7. Class Bivalva • Shell-fish • Two-part shell • Why do they not need an anterior end? • Gills

  8. Class Gastropoda • Diverse • Big foot • Radula • Gills • Which mollusks have a lung?

  9. Class Cephalopoda • Shell  movement • Brain development • What has happened to the cephalopod’s shell?

  10. Phylum Echinodermata • Marine • Symmetry shift • Why might Echinoderms have radial symmetry as adults? • Endoskeleton

  11. Joint-Legged Animals

  12. Joint-Legged Animals • Arthropods

  13. Phylum Arthropoda • Segmented body • Exoskeleton • Hemocoel • Coelom • Gas exchange – gills & trachea

  14. Moulting in Arthropods • Exoskeleton limits size

  15. Open Circulatory System • Hemocoel • Ancient annelids developed blood instead of body fluid

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