Five new species of Tylenchus Bastian, 1865 (Nematoda:Tylenchidae) from the Canadian high Arctic

Abstract

Five new species of Tylenchus Bastian, 1865 from the Canadian high Arctic are described. T. neodavainei n. sp., differs from T. davainei in having finer annules on the lip region and a more slender body. T. stylolineatus n. sp. differs from T. (Tylenchus) arcuatus in having a lower lip region, finer lip annulation, and spear knobs rounded. T. hazenensis n. sp. differs from T. (Filenchus) thornei in not having an offset lip region which is finely annulated and a needle-shaped tail terminus. T. hazenensis differs from T. (Filenchus) ruatus in the ratio between the anterior and posterior portions of the spear length, the tail proportionally shorter and broader, and the basal esophageal bulb not exceptionally elongated. T. aquilonius n. sp. differs from T. (Filenchus) orbus in having a more slender spear, an ovate median bulb, excretory pore well posterior to the nerve ring, and coarser body annulation. T. cylindricaudus n. sp. differs from T. aquilonius n. sp. in having a slender body, the tail more cylindrical, and body annulation indistinct.