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Embryogenic Studies of Some Xiphinema and Longidorus Species 1 )

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For more content, see Nematology.

Similar embryogenic patterns are shown by Xiphinema diversicaudatum, X. vuitlenezi, Xiphinema sp., Longidorus profundorum and L. macrosoma, 19-30 days elapsing between laying and hatching. This period, although apparently longer than previously recorded for phytoparasitic nematodes, is commensurate with the 3-year or more life span of these species. Development starts shortly after laying and the 8-cell stage is reached after about 15% of the total development time has elapsed. Thereafter divisions are more rapid, with gastrulation complete and the larva vermiform after about half of the total development time. The spear-forming cell lays down both functional and replacement odontostyls in 6-8 days. The vermiform larva moves actively during elongation, which is followed by a 24-48 hour quiescent period. Shortly before hatching, activity is resumed, accompanied by increasing flexibility of the egg membranes, which ultimately rupture under pressure from the whole head.

Affiliations: 1: East Malling Research Station, Maidstone, Kent, England


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