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1 Kingdom: Animalia Phylum: Nematoda Common names : Nematodes,Roundworms, Ascarids Examples: Hookworms, pinworms, Trichina worms, Ascaris worms, dog and cat heartworms Pin worm Hookworms 2 Hookworms Ascarids Dog Heartworms 3 1. Body Cavity Type: pseudocoelom Space between gut and body wall Filled with fluid = hydrostatic skeleton NOT lined with peritoneum 2. Level of Organization : organ system 3. Symmetry : bilateral 4. Habitat: Freeliving: Terrestrial (damp), worldwide, even polar Aquatic Endoparasites of mammals 5. Feeding: mouth-> pharynx->intestine->rectum->anus Complete digestive tract (gut) with mouth & anus 6. Respiration: diffusion 7. Internal Transport: diffusion 8. Excretion: diffusion & system of _glands with excretory pores 4 9. Response: No cephalization, no brain anterior ganglia & nerve cords 10. Locomotion: Longitudinal muscles only (NO circular muscles) Movement = thrashing, whip-like movement 11. Reproduction: Sexual only, pattern = dioecious (separate sexes) Copulatory organs present, internal fertilization 12. Ecological Roles: Free- living – cause damage to plants (crops) Parasites – damage to livestock, wild animals, pets and humans 5
