1 / 20

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

rusty
Télécharger la présentation

Distinguishing characteristics of phylum Annelida Segmented worms Setae

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related