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The Musculature of the Anterior Feeding Apparatus of Xiphinema Species (Nematoda: Dorylaimoidea)

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For more content, see Nematology.

The musculature of the stylet of Xiphinema spp. has been examined by electron microscopy. Protractor and retractor muscle slips are connected to syncytial cytoplasm in the body wall just posterior to the nerve ring-seven nuclei are associated with the protractors, one with the retractors. These muscles may be developed from arcade tissue. Anterior muscles of the body wall include one muscle per quadrant that contains an inner band of myofilaments that will act as a cheilostome compressor. "Dilatores buccae" muscles are slips of another somatic muscle. The longitudinally aligned myofilaments in these cells may result in retraction of the cheilostome. The movement of the stylet was studied during locomotion, feeding on roots, and when worms were exposed to nematicide, in order to suggest the functions of the various stylet muscle systems.

Affiliations: 1: ) Zoology Department, University of Toronto, Toronto, Ontario, Canada M5S 1A1; 2: ) Scottish Crop Research Institute, Invergowrie, Dundee, Scotland


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