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INVERTEBRATES

INVERTEBRATES. I) Phylum: Porifera (sponges) A) Characteristics 1) asymmetrical bodies 2) 2 body layers 3) specialised cells i) but no tissues ii) won’t die if seperated from organism iii) porocyte, spicules, collar cells,amoebocyte 4) porous body

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INVERTEBRATES

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  1. INVERTEBRATES

  2. I) Phylum: Porifera (sponges) A) Characteristics 1) asymmetrical bodies 2) 2 body layers 3) specialised cells i) but no tissues ii) won’t die if seperated from organism iii) porocyte, spicules, collar cells,amoebocyte 4) porous body i) cells in direct contact with environment

  3. 5) filter feeders 6) sessile as adults

  4. *

  5. II) Phylum: Cnidaria (hydra,jellyfish, sea anemones, corals)

  6. hydra

  7. sea anemone

  8. coral

  9. jellyfish

  10. A) Characteristics 1) marine 2)radial symmetry 3)2 cell layers 4)simple nervous system (net-like) a) tentacles with nematocysts

  11. *

  12. 5) digestive system with 1 opening!

  13. 6) 2 body forms a) polyp: attached to surface, tentacles up or down and/or b) medusa: flat, mouth down, moves (contractions or currents)

  14. III) worms: flatworms (Platyhelminthes) round worms ( Nematoda) segmented worms (Annelids) A) characteristics (ex.planaria, tapeworm) 1) bilateral symmetry (definite head!) 2) acoelomate (no body cavity)

  15. planaria

  16. tapeworm

  17. B) characteristics (nematodes) 1) fluid-filled body cavity 2) one-way digestive system: ANUS!!!

  18. nematodes

  19. Parasitic worms:

  20. *

  21. C) characteristics (segmented worms) 1) segmentation a) division of body into sections b) animals can increase in size by adding more identical segments c) different segments can perform different functions ex. earthworm 2) coelom (fluid filled body cavity) a) room for complex internal organs

  22. earthworm

  23. IV) Phylum: Mollusca A) characteristics 1) bilateral symmetry 2) 3 cell layers 3) coelom 4) 2 body openings 5) soft body, hard shell a) mantle surrounds internal organs and secretes calcium carbonate for shell 6) organ systems (circulatory, respiratory, excretory, reproductive, nervous)

  24. B) 3 main groups 1) gastropods (snails, slugs) a) aquatic or terrestrial b) carnivorous or decomposers c) radula for feeding d) muscular foot e) sexual fertilisation i)gametes may meet in water

  25. 2) bivalves (clams, mussels) a) 2 shells (hinged) b) no cephalization c) muscular foot

  26. 3) cephalopods (squid, octopus) a) large brain b) grasp prey with arms, beak tears apart c)siphon for movement

  27. *

  28. V) Phylum: Echinodermata (ex. starfish, sea urchins, sand dollars, sea cucumbers) A) Characteristics 1) all marine 2) have coelom 3) have 1-way digestive system 4) most with radial symmetry

  29. *

  30. 5) no cephalization (head) 6) internal skeleton for protection and support (endoskeleton)

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