INVERTEBRATES: PSEUDOCOELOMATES

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Chapter 25

• INVERTEBRATES PSEUDOCOELOMATES

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Phylum Nematoda - round worms

• The basics
• Of ecological medical importance
• Consume organic matter in soil
• Promote nutrient cycling by enhancing bacterial
  fungal activity in soil
• Parasitic species inhabit almost every species of
  plant animal
• Approximately 30 are human parasites
• Widely distributed in soil, sea fresh water

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Characteristics

• Elongated, cylindrical, threads like body
• Separate mouth anus
• Cuticle-covered ectoderm
• longitudinal muscles, no circular muscles.
• Movement, a thrashing motion
• a pseudocoelan
• bilateral symmetry
• Separate sexes male is smaller

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• Human parasitic nematodes
• Ascaris
• Hookworms
• Trichnia worms
• Pin worms

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