Helicotylenchus scoticus n.sp. and a conspectus of the genus Helicotylenchus Steiner, 1945 (Tylenchida: Nematoda)
- 1) Scottish Crop Research Institute, Invergowrie, DD2 5DA, Dundee, Scotland, UK
- 2) Commonwealth Institute of Parasitology, 395A Hatfield Road, AL4 0XU, St. Albans, Herts, England
Helicotylenchus scoticus n. sp. is described. It was found at an altitude of 660 m on the north-west slope of Sgurr Cos na Breachd-laoidh, Scotland, in a rough grassland consisting predominantly of tufted hair grass (Deschampsia caespitosa). This species is characterized by a relatively long spear and an oesophagus which superficially appears to abut on to the intestine with virtually no overlap. The number of nominal species in the genus Helicotylenchus has increased considerably over recent years and stands now at 154 species. The task of identifying species in this genus using dichotomous keys has become increasingly more difficult. As a practical alternative a compendium is given which uses nine of the most diagnostic characters.
- 1 - sciences appliquees, technologies et medecines
- 2 - sciences biologiques et medicales
- 3 - sciences biologiques fondamentales et appliquees. psychologie
- 4 - genetique des eucaryotes. evolution biologique et moleculaire