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Movies on the life of Heligmosomoides polygyrus

 H polygyrus egg  This nematode releases unembryonated eggs and by the time they are passed in the feces have only undergone a few divisions. However, within 24 hours a first stage larva (L1) has formed and is ready to hatch. In this scene not the movement of the larva within he egg. You can briefly see the pointed tail pass into focus. (Differential interference contrast microscopy.)  Windows media download
~ 0.5 mb
 Quicktime download
~ 1.6 mb
 H polygyrus L3s  Within 1 week, larvae molt twice to become infective, third stage larvae (L3). They can survive several months in water when kept cool and moist resulting in severe contamination of their environment.  Windows media download
~ 0.4 mb
 Quicktime download
~ 1.3 mb
 H polygyrus L3  The third stage larva is rounded anteriorly and has a pointed tail. The bright granules are intestinal contents. (Dark field microscopy.)  Windows media download
~0.6 mb
 Quicktime download
~ 2.0 mb
 H polygyrus L3  The sinusoidal movement of the third stage larva is typical for most kinds of nematodes. At the end of the scene you can notice the cuticle of the second stage larva that is retained around the third stage larva as an adaptation to resist desiccation. (Differential interference contrast microscopy.)  Windows media download
~ 0.5 mb
 Quicktime download
~ 1.4 mb
 H polygyrus adult male  The adult male is relatively short and has minimal coiling of the body. The copulatory bursa is visible at the posterior end, upper right. (Dark field microscopy.)  Windows media download
~ 0.4 mb
 Quicktime download
~ 1.4 mb
 H polygyrus adult female  The adult female is longer than the male and tightly coiled. The white material is eggs within the uterus. (Dark field microscopy.)  Windows media download
~ 0.7 mb
 Quicktime download
~ 2.2 mb
 H polygyrus adults in situ  Adults use their body coils to grip the intestinal mucosa. This scene shows two adults in a freshly opened portion of mouse intestine.  Windows media download
~ 0.5 mb
 Quicktime download
~ 1.7 mb
 H polygyrus in copula  This scene presents a male and female in copula. The bursa of the male (M) grasps the body of the female (F) around the vulva. The copulatory bursa is an important reproductive adaptation to parasitism in a nematode such as this, which lives near the pylorus and is subject to strong peristaltic forces that might force mating individuals apart.  Windows media download
~ 0.4 mb
 Quicktime download
~ 1.4 mb