Descriptions of Rotylenchus species from New Zealand, including R. labiodiscus sp. n. (Nematoda: Hoplolaimidae)

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Abstract
Four Rotylenchus species are known from New Zealand: R. labiodiscus sp. n., R. buxophilus, R. robustus , and R. uniformis. R. labiodiscus has been found at one site only, and is the only species so far found associated with native vegetation. R. labiodiscus is characterised by the presence of males; both the female and the male have a flat lip cap, which is distinctly set off in the male; the female has a body length of 0.6–0.7 mm, a stylet length of 33–37 μm, a tail length of 14.5–29.5 μm, 7–9 lip annules, an almost hemispherical tail, and no longitudinal striation on the oesophageal part of the body. Illustrations, key features, and measurements of representative populations are given for each species.

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