Canadian Forest Service Publications
Morphometric and morphological characteristics for identifying the life stages of Xiphinema bakeri Williams, 1961 (Nematoda: Longidorinae) 1970. Sutherland, J.R.; Dunn, T.G.; Cousens, N.B.F. Canadian Journal of Zoology 48(4): 771-773.
Issued by: Pacific Forestry Centre
Catalog ID: 28273
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Several morphometric and morphological characteristics were evaluated to determine their usefulness in identifying the life stages of Xiphinema bakeri. The stages can be identified by length of the body, onchiostylet, and replacement stylet of larvae. These values increase lineally from first-stage larva to adult, and fall into five groups corresponding to the nematodes' four larval stages and adult. Each stage has a specific tail-tip shape, which gradually changes from subacute in the first and second stages to subdigitate in adults. At lower magnifications, the body length and the tail shape, used in combination, are best for identification. First-stage larvae also have the replacement stylet overlapping the stylet extension, distinguishing them from the second stage. Frequently the immature vagina of fourth-stage larvae appears as a clear area in the body; this helps to separate them from the third stage.