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Phylum Nematoda

Phylum Nematoda. Invertebrate Project. PHYLUM NEMATODA. Roundworms 24,773 KNOWN SPECIES NON-SEGMENTED WORM WITH PSEUDOCOELOM FIRST ORGANISM WITH MOUTH AND ANUS. Symmetry. Bilateral. FEEDING. Diverse (mostly bacteria, protozoa, algae) Carnivores (meat)

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Phylum Nematoda

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  1. Phylum Nematoda Invertebrate Project

  2. PHYLUM NEMATODA • Roundworms • 24,773 KNOWN SPECIES • NON-SEGMENTED WORM WITH PSEUDOCOELOM • FIRST ORGANISM WITH MOUTH AND ANUS

  3. Symmetry • Bilateral

  4. FEEDING Diverse (mostly bacteria, protozoa, algae) • Carnivores (meat) • Detritivore (decaying organic matter) • Omnivores (both) • Herbivores (plants) • Many parasites

  5. RESPIRATION • DIFFUSION Through the skin

  6. CIRCULATION • Not Developed • DIFFUSIONinto cells

  7. EXCRETION • Not developed • Diffusion of wastes (CO2 and Ammonia)

  8. RESPONSE • Ganglia (nerve cells) within head attached to nerve cords • Four nerves run the length of the body • Sensory organs that detect chemicals

  9. MOVEMENT • Muscle cells (length of bodies) contract to move • Hydrostatic Skeleton

  10. REPRODUCTION • Sexual Reproduction (most have separate males & females) • Internal Fertilization • Rare cases (hermaphrodites)

  11. Digestive System • Developed digestive system – intake mouth and out-put - anus • External digestion (in body cavity)

  12. Roundworm Examples • Trichinosis-Causing Worms (Pork) • Cause trichinosis • Live in intestines of host • Invade hosts organs and muscle tissue • Filarial Worms • Line in blood/lymph vessels • Transmitted through biting insects • Cause elephantitis • Ascarid Worms • Cause malnutrition, spread by eating vegetables • Hookworms • Live in soil and hook onto feet of host, burrow into skin and enter bloodstream • Suck hosts blood in lungs and intestines causing weakness

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