Abstract
A morphological study of the Z organ in specimens of Xiphinema diversicaudatum (Micol.) Thorne and X. ingens Luc & Dalmasso has shown that this structure consists of globular bodies each formed by a cytoplasmic portion of a cell of the uterine wall to which droplets of secretion adhere. All the Xiphinema species in which the Z organ is known to occur possess a spermatheca. It is suggested that this is a system for slowing down the passage of eggs during the process of shell formation and for preventing reflux of sperms as the eggs move towards the vagina. The presence of Z structures therefore seems related to an amphigonic type of reproduction.
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