The genus Oligonychus Berlese (Acari, Prostigmata, Tetranychidae): taxonomic assessment and a key to subgenera, species groups, and subgroups Author Mushtaq, Hafiz Muhammad Saqib https://orcid.org/0000-0002-6678-4325 Acarology Laboratory, Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, P. O. Box No. 2460, Riyadh 11451, Saudi Arabia Author Alatawi, Fahad Jaber Acarology Laboratory, Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, P. O. Box No. 2460, Riyadh 11451, Saudi Arabia falatawi@ksu.edu.sa Author Kamran, Muhammad Acarology Laboratory, Department of Plant Protection, College of Food and Agriculture Sciences, King Saud University, P. O. Box No. 2460, Riyadh 11451, Saudi Arabia Author Flechtmann, Carlos Holger Wenzel Departamento de Entomologia e Acarologia, Escola Superior de Agricultura " Luiz de Queiroz ", Universidade de Sao Paulo, 13418 - 900, Piracicaba, Sao Paulo, Brazil text ZooKeys 2021 2021-12-22 1079 89 127 http://dx.doi.org/10.3897/zookeys.1079.75175 journal article http://dx.doi.org/10.3897/zookeys.1079.75175 1313-2970-1079-89 E3D873CB7039478D898608E461087E98 197A4D35B1015C98B02BCD9B2169132B 6. Oligonychus nielseni Reeves, 1963 Oligonychus nielseni Reeves, 1963: 57. Host and distribution. Pinus strobus ( Pinaceae ); United States. Remarks. Oligonychus nielseni Reeves was described from only females, and details of the male were absent in both the original ( Reeves 1963 ) and subsequent description ( Baker and Tuttle 1994 ). The species was not specifically compared with any other closely related Oligonychus species ( Reeves 1963 ). Moreover, variations have been reported in length of dorsocentral setae of the females from different populations, e.g., c1 reaching to bases of e1 ( Reeves 1963 ) or c1 shorter than the interval between c1-e1 ( Baker and Tuttle 1994 ). The species identity of O. nielseni will be resolved after collecting and describing the male from the type host and locality.