| Summary: | Four new species groups of the <i>Tenuipalpus</i> sensu lato group are proposed in the present study based on the total number of dorsal opisthosomal setae, namely, <i>carolinensis</i> with ten pairs of setae (214 species), <i>dubinini</i> with nine pairs of setae (33 species), <i>granati</i> with eight pairs of setae (29 species), and <i>barticanus</i> with seven pairs of setae (7 species) Additionally, diagnostic keys to species groups and 273 species of the <i>Tenuipalpus</i> sensu lato are provided. Three species, <i>T</i>. <i>lustrabilis</i> Chaudhri, <i>T</i>. <i>guptai</i> Sadana and Gupta, and <i>T</i>. <i>solanensis</i> Sadana and Gupta, are synonymized with <i>T</i>. <i>punicae</i> Pritchard and Baker. One species, <i>T. rodionovi</i> Chalilova, is suggested as a junior synonym of <i>T</i>. <i>granati</i> Sayed, and eight species, <i>T</i>. <i>chiococcae</i> De Leon, <i>T</i>. <i>costarricensis</i> Salas and Ochoa, <i>T. ephedrae</i> Livschitz and Mitrofanov, <i>T</i>. <i>molinai</i> Evans, <i>T</i>. <i>santae</i> Manson, <i>T</i>. <i>simplychus</i> Cromroy, <i>T</i>. <i>tetrazygiae</i> De Leon, and <i>T</i>. <i>oxalis</i> (Flechtmann), belonging to the <i>carolinensis</i> species group, are not included in the key. Furthermore, a new species of <i>Tenuipalpus</i> sensu lato, <i>T</i>. <i>jazanensis</i> sp. nov., is described and illustrated based on females collected from the <i>Chamaerops</i> spp. (Arecaceae).
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