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The Cephalic Sensory System of Rotylenchus Robustus and a Comparison With Some Other Tylenchids

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image of Nematologica
For more content, see Nematology.

The cephalic sensory system of Rotylenchus robustus (De Man) consists of eighteen branches of six nerve trunks, their arrangement corresponding to De Coninck's (1942) scheme of labial symmetry. The internal labial nerves each have two ciliary terminals; they are connected with the vestibule by pores. The lateral external labial nerves, having one ciliary process, are short; the other external labial nerves shift position with the respective cephalic nerves. The amphidial nerve contains eleven ciliary processes, seven of which are enclosed within the amphidial ampulla. No papillar projections are present; the external labial and cephalic nerves have blind endings in the cuticle. The reduction of the lateral external labial nerve is thought to be correlated with the relative size of the amphid and the reduction of the lateral sectors. A comparison is made with the cephalic sensory system of Macrotrophurus arbusticola, Ditylenchus dipsaci and Radopholus similis.

Affiliations: 1: ) Laboratorium voor Dierkunde, Faculteit Landbouw; 2: ) Instituut voor Dierkunde, Faculteit Wetenschappen, Rijksuniversiteit Gent, Belgium


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