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A Possible Gustatory Organ Associated With the Odontophore in Longidorus Leptocephalus and Xiphinema Diversicaudatum

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image of Nematologica
For more content, see Nematology.

In the plant parasitic nematodes Longidorus leptocephalus (Hooper) and Xiphinema diversicaudatum (Micoletzky) the long spear has two parts, the odontostyle and the odontophore. The odontophore is a modification of the anterior oesophagus and contains three sinuses which lie parallel to and around the food canal. Each sinus opens posteriorly and has nerve tissue which connects with that in the oesophagus. Anteriorly the sinuses taper to a blind end but there are structures in the cuticle which link the sinuses and the food canal. Nerve processes in each sinus are contiguous with these structures and it is thought that this arrangement is a chemoreceptor sensing the contents of the food canal. The discriminating deep feeding behaviour of these nematodes and the position of the odontophore within the feeding apparatus supports the suggested gustatory function for the sinus tissues.

Affiliations: 1: Scottish Horticultural Research Institute, Invergowrie, Dundee DD2 5DA, Scotland


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