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

Growth and Form in Nematodes: Iv. Tail Length and Vulva Position GROWTH AND FORM IN NEMATODES: IV. TAIL LENGTH AND VULVA POSITION BY E. GERAERT Instituut voor Dierkunde, Ledeganckstraat 35, Gent, Belgium 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. Vulva and anus, pores usually situated on the mid-ventral line, are used to determine where the ratios c and V are calculated. These ratios are of unequal importance, c being rather unreliable and V very useful (Thorne & Allen, 1959; Tarjan, 1967 & Geraert, 1968). Two questions can be asked: why is http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematologica Brill

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

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Abstract

GROWTH AND FORM IN NEMATODES: IV. TAIL LENGTH AND VULVA POSITION BY E. GERAERT Instituut voor Dierkunde, Ledeganckstraat 35, Gent, Belgium 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. Vulva and anus, pores usually situated on the mid-ventral line, are used to determine where the ratios c and V are calculated. These ratios are of unequal importance, c being rather unreliable and V very useful (Thorne & Allen, 1959; Tarjan, 1967 & Geraert, 1968). Two questions can be asked: why is

Journal

NematologicaBrill

Published: Jan 1, 1979

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