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Variations of the first head annule in Canadian populations of Pratylenchus penetrans (Nematoda: Pratylenchidae) from three host plants



Variations of the first head annule in Canadian populations of Pratylenchus penetrans (Nematoda: Pratylenchidae) from three host plants



Canadian Journal of Zoology 58(7): 1336-1340



Configuration of the surface of the first head annule was compared in 80 females of Pratylenchus penetrans from cherry, strawberry and tobacco in Canada to assess its diagnostic value in species identification. Most significant were structural features of the oral plate, defined collectively as the oral disk, and its dorsal and ventral extensions. The oral plate varied, often markedly, in surface configurations that were representative of different species groups. Of these, the most distinctive were hexaradiate and dumbbell in shape, comprising, respectively, 25 and 35% of the total heads scanned by scanning electron microscope. In one female the oral plate was panduriform, representing another species group, whereas the rest were of intergrading forms of a hexaradiate symmetry. The relative proportions of these forms in a given population varied with the host, suggesting an external or selective influence. Of those in 25 females from strawberry, 25% were hexaradiate, and of 27 from cherry, 52% were dumbbell shaped. Also variable, but to a lesser extent, were the size, shape and position of the amphid apertures. It is concluded that similar studies under more variable conditions may further extend the diversity of forms. [AS].

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