The moulting pattern in Trichuris muris (Nematoda: Trichuroidea)

Abstract

A growth curve for Trichuris muris on the basis of total body length is presented, together with more detailed observations than previously described on the moulting pattern in this nematode developing in DBA-2 mice. The first moult was on days 9–11 after infection of mice with the nematode, at which time sex of the worms was generally not recognisable. The second moult was on days 20-21, when sex of the majority of the worms was recognisable. The third moult was on day 25 (males) and days 28–30 (females). The fourth moult was on day 28 (males) and days 32–34 (females). In general, the various moults were found to be much less "synchronous" than has been previously reported, with the exception of the third and the fourth moults in males. The active role of the stylet during emergence of the nematode from the moulted cuticle was evident.