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Ch 11 Phylum Annelida

Ch 11 Phylum Annelida. The segmented worms. Class Errantia (nee Polychaeta) Class Sedentaria. The Cambrian Explosion. Key Characteristics. coelomates. segmented. hydrostatic skeleton. longitudinal muscle. circular muscle. dorsal blood vessel. coelom. nephridium. intestine.

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Ch 11 Phylum Annelida

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  1. Ch 11 Phylum Annelida The segmented worms Class Errantia (nee Polychaeta) Class Sedentaria

  2. The Cambrian Explosion

  3. Key Characteristics coelomates segmented hydrostatic skeleton

  4. longitudinal muscle circular muscle dorsal blood vessel coelom nephridium intestine setae nephridiopore ventral blood vessels ventral nerve cord Basic Body Plan

  5. Annelid Nervous System Integrated Nervous System

  6. Annelid Excretory System Metanephridia

  7. Marine Annelid Reproduction Trochophore Larva

  8. Class Errantia • marine • parapodia & setae • predators or filter feeders • reproduce via epitoke • Clade Siboglinidae

  9. Crawlers & Swimmers

  10. Parapodia and Setae

  11. Longitudinal muscles Setae muscles Parapodium Oblique muscles

  12. Movement

  13. Epitoke

  14. Epitoke

  15. Bearded fireworm (Hermodicecarunculata) • Venomous white bristles extended in defense

  16. Class Sedentaria Tube or Burrow Dwellers

  17. Siboglinidae(Pogonophorans = “beardworms”) • Bilateral symmetry • No mouth, no digestive system • Absorb some nutrients via tentacles • Deep sea dwellers • Obtain most energy needs via hydrogen sulfide oxidizing bacteria So - why are they considered to be annelids?

  18. Affinities with Annelids • molecular analyses • metameric segmentation of opisthosoma • photoreceptor cells • chitinous cuticle • setae

  19. Echiuridae spoon worms and innkeepers • bilateral • Closed circulatory system • 1-3 pairs of nephridia • unsegmented • trocophore larva

  20. PolychaeteSedentaria • Christmas tree worm (Spirobranchus giganteus), abundant in the Caribbbean • The two spiral crowns can retract into a tube, which is covered by the operculum

  21. Polychaete Sedentaria • Social feather duster (Bispira brunnea) grows in clusters • Common in the Caribbean

  22. PolychaeteSedentaria • Social feather duster (Bispira brunnea) with crowns of radioles extending from parchment-like tubes • Light brown color characteristic in Belize

  23. PolychaeteSedentaria • Split-crown feather duster (Anamobaea orstedii), common in the Caribbean • When disturbed, worm retreats into parchment tube

  24. Oligochaeta Epigeic Endogenic Anecic

  25. Feeding & Digestion

  26. Setae

  27. Earthworm Locomotion

  28. Earthworm Reproduction

  29. Aquatic Oligochaetes - Tubifex

  30. Whirling Disease Tubifex worms ingest microscopic spores laying on river bottom. The spores hatch and the protozoan-like parasite is released into the water. Parasite burrows through the skin of the trout, mates, and releases small larvae which migrate to the nervous system. When larvae reach the brain, attack cartilage, develop into spores. Infected fish develop characteristic “whirling” behavior and die, releasing spores to repeat the cycle.

  31. Hirudinea circular muscle sinus diagonal muscle gut caecum sinus longitudinal muscle sinus dorso-ventral muscle nerve cord

  32. Leech Reproduction

  33. Movement

  34. Phylum Sipuncula

  35. bilateral • unsegmented • tentacles • one pair of nephridia • introvert • entirely marine and benthic • no circulatory or respiratory systems

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