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Phylum Nematoda

Phylum Nematoda, commonly known as roundworms, comprises over 24,773 known species. These non-segmented, bilateral invertebrates possess a pseudocoelom, a developed digestive system, and reproduce mainly through sexual means. Nematodes exhibit diverse feeding habits—some are carnivores, detritivores, herbivores, and many are parasitic. They rely on diffusion for respiration and waste excretion. With a complex response system, including gangs and nerve cords, they demonstrate intriguing movement mechanisms. Examples include Trichinella and hookworms, known for their impact on human health.

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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

  13. https://www.bing.com/videos/search?q=video+nematodes&docid=608046778098845494&mid=2D057D6C6E4AAD3686762D057D6C6E4AAD368676&view=detail&FORM=VIREhttps://www.bing.com/videos/search?q=video+nematodes&docid=608046778098845494&mid=2D057D6C6E4AAD3686762D057D6C6E4AAD368676&view=detail&FORM=VIRE

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