SHORT COMMUNICATION J. R. WILLIAMS 1) : The position of the spear guiding ring in Xiphinema species. The position of the thickened ring of the spear guiding sheath (the 'basal', 'fixed', or 'guiding' ring of authors) relative to the spear and the head end is an important character of the genus Xiphinema. In all known species the ring is situated well behind the head end towards the base of the spear (odontostyle) and the spear extension passes into it when the spear is protruded appre- ciably. Several authors have included the distance of the ring from the head end in descriptions of species (Table I) and Coomans (1964) suggested its use generally in descriptions of Dorylaimina. Cohn & Martelli (1964) mention it as the only character of some importance by which two geographically separated populations of Xiphinema ingens Luc & Dalmasso, 1964 differed. The measurements given for the character have a wide range in some species. TABLE I Distance of guiding ring from head end in species of Xiphinema Only Heyns (1965) noted that the magnitude of the measurements depend on the extent to which the spear is protruded, i.e. the ring can move with movement of the
Nematologica – Brill
Published: Jan 1, 1966
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