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Describe the internal parts of the …

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Describe the internal parts of the Earth worm.
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Yogita Ingle 4 years, 3 months ago

Morphology

  • Earthworms have long cylindrical body divided into 100-120 similar short segments known as metameres .
  • The dorsal surface of the body is marked by a dark median mid dorsal line along the longitudinal axis of the body and the ventral surface is distinguished by the presence of genital openings.
  • Anterior end consists of the mouth and the prostomium, covering the mouth.
  • The first body segment is called the peristomium, which contains the mouth.
  • In a mature worm, segments 14-16 are covered by a prominent dark band of glandular tissue called clitellum, thus dividing the body into preclitellar, clitellar and postclitellar segments.
  • Four pairs of spermathecal apertures and a pair of male genital pores are situated on the 5th -9th segments and 18th segment, respectively.
  • A single female genital pore is present in the mid-ventral line of 14th segment.
  • Numerous minute pores called nephridiopores open on the surface of the body.
  • Except the first, last and clitellum, there are rows of S-shaped setae in each segment, help in locomotion.
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