Four New Species of Plant Parasitic Nematodes (Nematoda: Tylenchida) From the Arid Region of South Australia

Four new species of plant parasitic nematodes are described from the arid region of South Australia. Tylenchorhynchus siccus n. sp. is bisexual and is distinguished by a relatively long stylet (24-30 μm), protruding, double epiptygma (from 6 to 9 μm in length), coarsc annulation (1.9 μm), annulated tail terminus and areolated outer incisures of the lateral field (especially on the tail). Tylenchorhynchus novenus n. sp. is bisexual and distinguished by the cuticle having 18 longitudinal ridges (nine dorsal and nine ventral) and three in each lateral field with the lateral field raised above the other ridges. The body cuticle is finely annulated with the tail terminus non-annulated. Morulaimus simpsoni n. sp. is bisexual and is distinguished by a relatively small stylet (49-61 μm), and very long tail in males (mean = 103 μm) and females (mean = 74 μm). Rotylenchus wallacei n. sp. is bisexual and is distinguished by the outer lateral incisures being completely areolated the length of the body, offset lip region and three distinct lip annuli.