O'Grady R T, Harpur R P
J Helminthol. 1985 Jun;59(2):137-41. doi: 10.1017/s0022149x00025712.
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.
研究了猪蛔虫第四期幼虫和成虫在感染后11至22天于猪肠道内的发育情况。这是一个快速生长的时期，在此期间，雌雄虫体长度均增加约10倍。对雌虫的进一步检查表明，长度的增加相对于体直径呈正异速生长。第四期早期的生殖原基在虫体长度方向上的相对位置与新孵化幼虫中的相同。在从第四期发育到成虫期的过程中，虫体后部的更大生长导致发育中的阴门相对位置向前移动。
