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Growth and form of the fourth-stage larvae and early adults of Ascaris suum Goeze, 1782 (Nematoda: Ascaridoidea) developing in pigs

Published online by Cambridge University Press:  18 November 2009

Richard T. O'grady  and
Robert P. Harpur
Richard T. O'grady
Affiliation:
Institute of Parasitology, McGill University, Macdonald College Campus, Ste. Anne de Bellevue, Québec, II9X 1 CO, Canada
Robert P. Harpur
Affiliation:
Institute of Parasitology, McGill University, Macdonald College Campus, Ste. Anne de Bellevue, Québec, II9X 1 CO, Canada
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Abstract

The fourth-stage larvae and adults of Ascaris suum were studied as they developed in the pig intestine from 11 to 22 days after infection. This is a period of rapid growth, in which both sexes increase approximately ten-fold in body length. Further examination of females showed the length increase to be positively allometric with respect to body diameter. The genital primordium in early fourth stage is at the same relative position along the length of the body as it is in the newly hatched larva. During development from fourth stage to adulthood the greater growth of the posterior part of the worm causes the relative position of the developing vulva to shift anteriad.

Type
Research Article
Information
Journal of Helminthology , Volume 59 , Issue 2 , June 1985 , pp. 137 - 141
Copyright
Copyright © Cambridge University Press 1985

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