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Phylum Annelida

Phylum Annelida. Phylum Annelida. Characteristics Protostomia, eucoelomates Metamerism (= unspecialized segmentation) In the Classes: Parapodia Clitellium. Systems. Integument - epidermis is one cell layer with mucous gland that secrete a moist cuticle.

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Phylum Annelida

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  1. PhylumAnnelida

  2. Phylum Annelida • Characteristics • Protostomia, eucoelomates • Metamerism (= unspecialized segmentation) • In the Classes: • Parapodia • Clitellium

  3. Systems • Integument- epidermis is one cell layer with mucous gland that secrete a moist cuticle. • Skeletal -hydrostatic (using coelom) • Muscle- longitudinal and circular muscles Each segments muscles are independent of the other segments. • Digestive- complete, complex, with typhlosole for absorption and chloragogen cells acting as digestive gland and excretory cells.

  4. Systems (continue) • Excretory- a pair of nephridia per segment. • Respiratory -through skin, some through parapodia; tubeworms have gills. • Circulatory- closed system, use hemoglobin as oxygen carrier. • Nervous- dorsal brain; ventral, double, solid nerve cord, with gangliain each segment. • Endocrine- hormones secreted by nervous system. • Reproductive- • Dioecious in Polychaeta; no special organs, posterior end becomes gonads. • Monoecious in Oligochaeta and Hirudinea; Clitellium.

  5. Annelida Taxonomy Click on any term that is underlined to go to that slide • Phylum Annelida (an-nel-i-da) • Class Polychaeta (poly-key-ta) • Nereis, Aphrodita, Chaetopterus, Arenicola, Amphitrite • Class Oligochaeta (ol-e-go-key-ta) • Lumbricus, Tubifex • Class Hirudinea (hi-ru-din-e-a) • Hirudo, leech • Earthworm dissection

  6. Nereis Nereis Nereis(clam worm) Return to taxonomy

  7. dorsal ventral Aphrodite (sea mouse) Return to taxonomy

  8. Arenicola (Lug worm) Chaetopterus Amphitrite (plum worm) Other Polychaetes Return to taxonomy

  9. Hirudo (leech) Return to taxonomy

  10. clitellium dorsal ventral Lumbricus Return to taxonomy Lumbricus

  11. Earthworm Dissection Return to taxonomy Cross section

  12. Return to taxonomy Earthworm cross section

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