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Phylum Nematoda
Roundworms
Ex. Trichinella, hookworm, pinworm, heartworm
Nematos - threadlike
Over 25,000 known species
Parasitic and free-living
Found in every habitat on earth
Characteristics of Phylum Nematoda
Body Type: Bilateral Symmetry
Body Organization: TriploblasticThree tissue layers
Endoderm, Mesoderm, Ectoderm
Body Cavity: Pseudocoelom
bodycavities
Ecological Roles:Parasitic: Affect both plants and animals
Food source
Aerate soil
Decomposers
lamelle-460
Digestive System:Complete digestive system (mouth and anus separate)
Specialized organs for breakdown and absorption of nutrients
nematode.jpgReproduction:Sexual: Dioecious (sexes separate)
Asexual: None
Circulation: Diffusion
Nervous System: Ganglion (brain), dorsal and ventral nerve cords & sensory organs
Respiration: Diffusion through skin
Excretion: anus & tubes
Trichinella (Undercooked pork)
Parasitic Nematodes
Filarial wormLLymphatic or Subcutaneous Filariasis
Hookworm
hookworm.jpg