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Ultrastructure of the Guide Ring and Guiding Sheath in Xiphinema and Longidorus

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For more content, see Nematology.

In Xiphinema and Longidorus the guide ring is identified as a distinct annulus at the base of the cuticular wall of the distal part of the stoma and is joined to the guiding sheath by a thin, flexible connection. In Longidorus an amorphous tissue surrounds the cuticular guiding sheath and connects via four canals near the guide ring to lobes of similar tissue within the hypodermal chords. The tissue is thought to have a hydrostatic function and ensures the tight enclosure of the stylet by the guiding sheath. In both genera the guiding sheath encloses the odontophore for about one third of its length and appears to fuse with it.

Affiliations: 1: Scottish Horticultural Research Institute, Invergowrie, Dundee, Scotland


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