Abstract
THE vulval flap of trichostrongylid nematodes is of interest to taxonomists and its presence or absence and its form are regarded as characteristic of different species. Recent work with experimental infections of Ostertagia ostertagi in calves has shown that the vulval flap, which in this species is normally large and well developed, may be greatly reduced or entirely absent in worms from resistant hosts. This is illustrated in Fig. 1.
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References
Michel, J. F., Parasitology, 53, 63 (1963).
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MICHEL, J. Morphological Changes in a Parasitic Nematode due to Acquired Resistance of the Host. Nature 215, 520–521 (1967). https://doi.org/10.1038/215520a0
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DOI: https://doi.org/10.1038/215520a0
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