TY - JOUR JF - Acarologia T1 - Chromosomes in spider mites (Tetranychidae-Acari) VL - 22 IS - 3 SP - 271 EP - 275 PY - 1981 SN - 0044-586X SN - 2107-7207 PB - Les Amis d'Acarologia AU - Bolland, H. AU - Gutierrez, J. AU - Helle, W. UR - https://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=2845 DA - 1981-10-31 KW - karyotypes KW - taxonomy AB - The chromosomes of fifteen tetranychid species were studied in embryonic tissue cells in acetic-orcein squashes. All bisexual species exhibit a haplo-diploid sex determination, resulting from arrhenotokous parthenogenesis. The taxonomic significance of karyotype information is discussed in relation to the genera Oligonychus and Tetranychus. A diploid number of 2 n = 8 occur in Tetranychina moutiai, Oligonychus gramineus, O. leandrianae, O. plegas, Tetranychus jijiensis and T. marianae; of 2 n = 6 in Schizotetranychus reticulatus, Eotetranychus uncatus, Oligonychus thelytokus, Tetranychus Iambi, T. lombardinii, T. macfarlanei, T. yusti and T. lintearius; of 2 n = 4 in Eutetranychus africanus. ER -