Trichuris trichiura is a member of the super-family, Trichuroidea, and is thus closely related to Trichinella spiralis (see Chapter 19b). The
adult has a thin elongated anterior portion and a thickened posterior, giving it a whip-like appearance, and its common name is the whip-worm. The worm is approximately 4 cm long and the male has a curled posterior end. The female genitalia, consisting of a singular sacu-late ovary, is found in the extreme posterior part of the body. The eggs are characteristically barrel-shaped, 50-54 ^ x 22-23 ^ (see Figure 21.3).
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