| Summary: | A checklist of arrenurids of Mexico is presented, including three new records from the Yucatan Peninsula. We provide updated descriptions of <i>Arrenurus mexicanus</i>, <i>A.</i> (<i>Megaluracarus</i>) <i>colitus</i>, and <i>A.</i> (<i>Megaluracarus</i>) <i>marshalli</i>. Additionally, four new species of the subgenus <i>Megaluracarus</i> and one of <i>Dadayella</i> are described by using integrative taxonomy: <i>Arrenurus</i> (<i>Megaluracarus</i>) <i>eduardoi</i> n. sp., characterized by a large, thorn-shaped hump in the middle dorsal shield; <i>Arrenurus</i> (<i>Megaluracaurus</i>) <i>federicoi</i> n. sp., with large pores in the body, including the idiosoma; <i>Arrenurus</i> (<i>Megaluracarus</i>) <i>ecosur</i> n. sp., with a peculiar pattern of setation in the legs; <i>Arrenurus</i> (<i>Megaluracarus</i>) <i>beatrizae</i> n. sp., with a short cauda with two pairs of lateral notches, and <i>Arrenurrus</i> (<i>Dadayella</i>) <i>cristinae</i> n. sp., characterized by a male cauda with two falcate setae. Non-destructive methods allowed the taking of scanning electron microscope images and DNA sequencing of the designed type material. All new species have a divergence using the DNA mitochondrial gene COI from 21.1% to 28.6% within them. With these records and descriptions, the number of <i>Arrenurus</i> registered for Mexico increases to 42, most of them from a single locality.
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