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Annelids, Molluscs

BSC 2011L. Annelids, Molluscs. Phylum Annelida. Segmented worms Circular and longitudinal muscles work against fluid filled coelom to produce changes in width and length Digestion – complete Circluation – closed (5 lateral hearts). Phylum Annelida. Class Oligiochaeta Earthworms

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Annelids, Molluscs

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  1. BSC 2011L Annelids, Molluscs

  2. Phylum Annelida • Segmented worms • Circular and longitudinal muscles work against fluid filled coelom to produce changes in width and length • Digestion – complete • Circluation – closed (5 lateral hearts)

  3. Phylum Annelida • Class Oligiochaeta • Earthworms • Found in soil • Can reach 3 meters!

  4. Phylum Annelida • Class Polychaeta • Sand worms, feather dusters • Almost all marine • Live in substrate

  5. Phylum Annelida • Class Hirudinea • Leeches • “bloodsuckers”

  6. Phylum AnnelidaClass Oligiochaeta • Animal: Earthworm • Symmetry: Bilateral • Body cavity: coelomate – protostome • Digestion: complete – mouth, esophagus, crop, gizzard, etc • Circulation: closed, 5 hearts • Segmentation: yes • Appendages: none • Nervous: dorsal brain, ventral nerve cord • Habitat: moist soils • Respiration: diffusion through body surface • Excretion: 2 lateral tubes • Locomotion: circular and longitudinal muscles, setae • Support: hydrostatic skeleton

  7. Earthworm model

  8. Earthworm cross-section http://www.deanza.edu/faculty/mccauley/6a-labs-annelid-01.htm

  9. Earthworm Dissection

  10. Phylum Mollusca • Mostly marine but some are freshwater and terrestrial • 3 part body • Muscular foot – locomotion • Visceral mass – internal organs • Mantle – encloses visceral mass and may secrete shell • Digestion – complete • Circulation – open (except for cephalopods that are closed)

  11. Phylum Mollusca • Class Polyplacophora • “many plated” • Chitins

  12. Phylum Mollusca • Class Gastropoda • “stomach foot:

  13. Phylum Mollusca • Class Bivalvia

  14. Phylum Mollusca • Class Cephalopoda • “Head-foot”

  15. Phylum MolluscaClass Bivalvia • Animal: Clam • Symmetry: bilateral • Body cavity: coelomate – protostome • Digestion: complete, filter feeders • Circulation: open, blue blood, heart, blood vessels • Segmentation: none • Appendages: none • Nervous: 3 ganglia connected by nerves • Habitat: aquatic • Respiration: gills • Excretion: nephridia in kidney • Locomotion: muscular foot • Support: shell

  16. Clam model

  17. Phylum MolluscaClass Cephalopoda • Animal: squid • Symmetry: bilateral • Body cavity: coelomate – protostome • Digestion: complete, beak jaws • Circulation: closed, 3 hearts • Segmentation: none • Appendages: 8 arms, 2 tentacles • Nervous: brain of 3 fused ganglia, eye • Habitat: aquatic • Respiration: gills • Excretion: nephridia in kidney • Locomotion: muscular mantle, jet propulsion • Support: shell reduced to pen

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