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Phylum Annelida segmented worms

Annelid characters, continued. Closed circulatory system, often hemoglobin or chlorocruorin is present (extracellular).Complete digestive tract, regional specializationNephridia- usually paired in each coelomic compartment- urine forms as filtrate of coelomic fluid.Monoecious or dioecious. Primi

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Phylum Annelida segmented worms

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    1. Phylum Annelida (segmented worms) Large phylum ~12,400 species (vs 100,000 Mollusks, 1,000,000 Arthropods) marine, freshwater, and terrestrial (soils) Eucoelomate, schizocoelous Metameric, with partitioning of coelomic compartments- facilitates burrowing Collagen cuticle and chitin bristles (setae, chaetae)

    2. Annelid characters, continued Closed circulatory system, often hemoglobin or chlorocruorin is present (extracellular). Complete digestive tract, regional specialization Nephridia- usually paired in each coelomic compartment- urine forms as filtrate of coelomic fluid. Monoecious or dioecious. Primitively external fertilization, but internal in Clitellata

    3. Annelida- classification Class Polychaeta Polychaetes- mainly marine very diverse- ~8,000 species, 22 orders! Includes three former phyla: Pogonophora, Vestimentifera, Echiurida Class Clitellata Subclass Oligochaeta ~3,500 sp. (includes earthworms) Mainly freshwater and terrestrial Subclass Hirudinea (leeches) ~600 sp. Freshwater and terrestrial

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