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Invertebrates

Invertebrates. Summary. Symmetry. Diploblastic vs Triploblastic. Embryonic Development. Body Cavity. Blastopore Devlopment. Porifera. Porifera. Asymmetrical No true tissue No body cavity Sessile Filter feeders. Cnidaria. Diploblastic No body cavity Radial symmetry

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Invertebrates

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  1. Invertebrates Summary

  2. Symmetry

  3. DiploblasticvsTriploblastic

  4. Embryonic Development

  5. Body Cavity

  6. BlastoporeDevlopment

  7. Porifera

  8. Porifera • Asymmetrical • No true tissue • No body cavity • Sessile • Filter feeders

  9. Cnidaria • Diploblastic • No body cavity • Radial symmetry • Gastrovascular cavity • Nematocysts

  10. Bilateral symmetry • Triploblastic • Protostome • Acoelomate • Cephalized • Flame cells maintain osmotic balance • Mouth, pharynx, & gastrovascular cavity Platyhelminthes

  11. Bilateral symmetry Cephalized Triploblastic Protostome Pseudocoelomate Nematoda

  12. Bilateral symmetry Triploblastic Protostome Coelomate Open circulation Nephridia Gills ClassGastropodaClassBivalviaClassCephalopoda Mollusca

  13. Mantle, Foot, & Visceral Mass

  14. Annelida

  15. Annelida Bilateral symmetry Triploblastic Coelomate Protostome Segmentation Closed circulation Respiratory skin Esophagus, crop, gizzard Nephridia (2 per segment)

  16. Arthropoda Triploblastic Protostome Coelomate Open circulation Exoskeleton Jointed appendages Gills, Tracheal system, or book lungs Malpighian tubules

  17. Intestine Stomach Digestive gland Brain Heart Eyes Poison gland Ovary Anus Book lung Spinnerets Sperm receptacle Gonopore (exit for eggs) Pedipalp Chelicera Silk gland Figure 33.32 Arthropoda • ClassCrustaceaClassArachnaClassInsecta

  18. (a) Larva (caterpillar) (b) Pupa (c) Pupa (d) Emerging adult (e) Adult Figure 33.6a–e Complete Metamorphosis

  19. Ecdysis

  20. Echinoderms Radial or bilateral symmetry Triploblastic Coelomate Deuterostome Endoskeleton Water vascular system Tube feet

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