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