A review on and identification tabular key for the species of the genera Bitylenchus, Sauertylenchus and Tylenchorhynchus (Nematoda: Telotylenchinae)

Document Type : Original Article

Authors

1 Department of Plant Protection, School of Agriculture, Shiraz University, Shiraz,, Iran

2 Department of Plant Protection, Faculty of Agriculture, University of Zanjan,, Zanjan, Iran

Abstract

The genus Tylenchorhynchus is one of the largest and most problematic taxa of plant-parasitic nematodes. The separation or combining of certain genera into a large genus as Tylenchorhynchus sensu lato has long been the subject of debate. Mostly due to incomplete descriptions of valid species and the limited number of diagnostic characters, species identification has also been a challenging task in the genus, even in Tylenchorhynchus sensu stricto with fewer species. In this study, a tabular identification key is provided for 136 valid species of Tylenchorhynchus and the closely related genera Bitylenchus and Sauertylenchus. Species are coded based on the status of nine diagnostic characters viz. the number of transverse annuli on lip region, lip region demarcation, stylet length, presence of post-rectal sac, number of cuticular annuli on the ventral side of tail, tail shape, value of c′ ratio, tail terminus striation, and gubernaculum structure, as well as special characters for certain species. As a result, sixteen groups were identified that show the same status for all these characters. Further discussions are provided on the detailed characterization of the closely related species in each group, if needed.

Keywords

Iranian Journal of Nematology
Volume 1, Issue 1
August 2022

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