1 / 17

Annelida

Annelida. Segmented Worms. Main Characteristics. Bilateral symmetry Protostomes Triploblastic Setae Closed Circulatory System Ganglia and Nerve Cords Metanephridia. Classes of Annelids. Polychaeta – Nereis, Arenicola Oligochaeta – Lumbricus, Tubifex Hirudinea - Hirudo.

kylene
Download Presentation

Annelida

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. Annelida Segmented Worms

  2. Main Characteristics • Bilateral symmetry • Protostomes • Triploblastic • Setae • Closed Circulatory System • Ganglia and Nerve Cords • Metanephridia

  3. Classes of Annelids • Polychaeta – Nereis, Arenicola • Oligochaeta – Lumbricus, Tubifex • Hirudinea - Hirudo

  4. Class Polychaeta • Mostly marine • Parapodia • Cuticle

  5. Polychaeta Feeding • Most carnivorous • Some have venom • Gut is straight tube • Some are detritovores • Eat dead and decaying matter. • Many are filter feeders

  6. Christmas Tree Worm

  7. Oligochaeta • Terrestrial, freshwater, some marine • Have a clitellum • For mucus secretion • Used in copulation • Used to form cocoons • No parapodia • Few setae

  8. Oligochaete Locomotion • Use circular and longitudinal muscles • Can use setae as anchors • Use hydrostatic pressure

  9. Oligochaete Feeding • Scavengers and/or detritovores • Path of food • Mouth • Pharynx • Crop • Gizzard • Stomach • Intestine

  10. Oligochaete Reproduction • Hermaphroditic • Must line up clitella • Held together by mucus sheath • Cocoon formed • Fertilization occurs here • No larval stages • Some freshwater species asexual

  11. Hirudinea • Terrestrial, freshwater or marine • No parapodia • Circular, longitudinal and oblique muscle layers

  12. Hirudinean Feeding • Many carnivorous • Small invertebrates • Body fluids • Mouth in the anterior sucker • Produce “hirudin” – anticoagulant

  13. Other Hirudinea Systems • Gas exchange by diffusion • Nervous system • Photoreceptors • Can sense temperature • Sensory papillae • 10-17 pairs of metanephridia for waste

  14. Hirudinea Reproduction • All sexually reproducing • Have a penis for sperm transfer • Clitellum seen during breeding season • No larval stages

More Related