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The "Z" Differentiation in Xiphinema: a Hypothesis of Its Function in Relation To Amphigony

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For more content, see Nematology.

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.

Affiliations: 1: Istituto di Zoologia e Anatomia Comparata dell' Università and Laboratorio di Nematologia Agraria del C.N.R. - 70126 Bari, Italy


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