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Distinguishing characteristics of phylum Annelida Segmented worms Setae

Distinguishing characteristics of phylum Annelida Segmented worms Setae Large compartmentalized coelom = hydrostatic skeleton. Annelids. Closed circulatory system Dorsal vessel carries blood away from heart Ventral vessel = back to heart Blood pigments: many have hemoglobin

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Distinguishing characteristics of phylum Annelida Segmented worms Setae

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  1. Distinguishing characteristics of phylum Annelida • Segmented worms • Setae • Large compartmentalized coelom = hydrostatic skeleton

  2. Annelids Closed circulatory system Dorsal vessel carries blood away from heart Ventral vessel = back to heart Blood pigments: many have hemoglobin Some Polychaetes have Chlorocruorin (Fe) And Hemerythrin (Fe)

  3. Phylum Annelida • Class Polychaeta = marine sand worms • Class Clitellata: • Oligochaeta = earthworms • Hirudinea = leeches

  4. Figure 13_01

  5. Figure 13_02

  6. Polychaeta • Marine worms with • Parapodia for locomotion and gas exchange • Setae on parapodia • Separate sexes mostly, external fertilization mostly • Trochophore larva • Develops by growing new segments

  7. Figure 13_07

  8. Figure 13_11 Polychaete trochophore

  9. Oligochaeta • Earthworms ~ 3500 species • A few short setae per segment • Body divided into more than 100 segments separated internally by septa

  10. Figure 13_27

  11. Figure 13_36

  12. Oligochaete reproduction Hermaphroditic Individuals exchange sperm Eggs fertilized later in clitellum = cocoon No larval stage

  13. Figure 13_35

  14. Hirudinea • Leeches ~ 500 species • Mostly freshwater • No head appendages (prostomium) • Most do not have setae • Suckers for locomotion and holding onto host

  15. Hirudinea Many are ectoparasites = medical use Hirudin = anticoagulant ~25 % not parasites = carnivores, detritivores

  16. Hirudinea reproduction Simultaneous hermaphrodites Clitellum functions as cocoon No larval form

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