Trichuris trichiura (Whipworm) – Adult

  • Disease: Trichuriasis
  • Habitat in human: Large intestine – specially caecum and colon
  • Diagnosis of infection: Microscopic examination of faeces to detect eggs
Morphological Features
  • Colour: Greyish white worm, often with a pink tint on posterior part
  • Shape: resemble a whip – thread-like along most of body, with a thicker short portion at posterior end
  • Mouth is a simple opening – lacks lips
  • Buccal cavity is tiny with a spear-like projection
  • Oesophagus: Narrow non-muscular tube; no posterior bulb; occupies ~2/3rd of body length
  • Posterior 1/3rd of body contains intestine and reproductive organs
  • Size: Less than 4.5 mm long – slightly smaller than female
  • Posterior end is coiled
  • Single copulatory spicule in a retractile sheath covered with spines
  • Single testes
  • Size: 3 – 5 cm long
  • Posterior end is bluntly rounded
  • Single ovary