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Growth and Form in Nematodes: Iv. Tail Length and Vulva Position

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For more content, see Nematology.

During post-embryonic growth tail length can increase, remain constant or even decrease. Usually, such changes cannot be explained as populations of the same species may behave differently. The differences in length between males and females is based, I suggest, on the mechanics of mating and on requirements for defaecation. The constant position of the vulva is probably not essential functionally but may arise from the cell-constancy of the nematodes and equal elongation of epidermal cells in front of and behind the vulva. The position of the vulva is usually expressed as a percentage of the entire body length but, in several long tailed tylenchs, it is better to calculate it as a percentage of the distance between the top of the head and the anus.

Affiliations: 1: Instituut voor Dierkunde, Ledeganckstraat 35, Gent, Belgium


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