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Annelids

Annelids. Study Dissections Lab Notes. Annelid Characteristics. Well developed true coelom Segmented (reduced or lost in some) Complete digestive tract with regional specialization Closed circulatory system with respiratory pigments Well-developed nervous system

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Annelids

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  1. Annelids Study Dissections Lab Notes

  2. Annelid Characteristics • Well developed true coelom • Segmented (reduced or lost in some) • Complete digestive tract with regional specialization • Closed circulatory system with respiratory pigments • Well-developed nervous system • Usually with lateral chaetae (setaes) on each segment • Marine, fresh water, and terrestrial environments

  3. Class ClitellataSubclass Oligochaeta • Characteristics • Few chaetae (setae); lack parapodia • Little structural specialization of head • Presence of clitellum (forms muscus and egg cocoon) • Mostly in terrestrial or fresh water environments

  4. Lumbricus terrestris • Earthworm (Night Crawler) dissection follows on the next set of slides

  5. Nephridia Ventral nerve cord

  6. Aortic arches

  7. Seminal receptacles

  8. Nephridia nerve cord

  9. Class ClitellataSubclass Hirudinoidea - Leeches • Segmenting less defined; body not divided by septa • Clitellum present • Lack setae or parapodia • Have a posterior sucker and usually also an anterior sucker • Mostly in fresh water, a few are marine and semi-terrestrial • May be scavengers, predators, or external parasites

  10. Class Polychaeta • Numerous chaetae (setae) on segments • Most have parapodia • Often with tentacles, sensory, or feeding structures on head • Some have chitinous jaws • Lack clitellum • Mostly marine; burrow, crawl over substrates, or live in tubes • This class may be paraphyletic

  11. Neries The Clam Worm

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