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A checklist of arrenurids of Mexico is presented, including three new records from the Yucatan Peninsula. We provide updated descriptions of Arrenurus mexicanus, A. (Megaluracarus) colitus, and A. (Megaluracarus) marshalli. Additionally, four new species of the subgenus Megaluracarus and one of Dadayella are described by using integrative taxonomy: Arrenurus (Megaluracarus) eduardoi n. sp., characterized by a large, thorn-shaped hump in the middle dorsal shield; Arrenurus (Megaluracaurus) federicoi n. sp., with large pores in the body, including the idiosoma; Arrenurus (Megaluracarus) ecosur n. sp., with a peculiar pattern of setation in the legs; Arrenurus (Megaluracarus) beatrizae n. sp., with a short cauda with two pairs of lateral notches, and Arrenurrus (Dadayella) cristinae 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 Arrenurus registered for Mexico increases to 42, most of them from a single locality. [ABSTRACT FROM AUTHOR]

Some researchers have proposed the groundwater protection zone (GPZ) method as a methodological framework for defining safeguard zones of groundwater bodies. Its goal is to protect the quality of water intended for human consumption and to facilitate a common implementation of this method in all European Union member states. One of the criteria used to establish GPZs is to define contributing catchment areas (CCAs). This methodology has been applied to the Sierra de Cañete, a region comprising a carbonate aquifer in the province of Malaga, Spain. The tools used to define CCAs are hydro-chemical and isotopic characterizations, namely water isotopes (i.e., ²H, 18O and tritium) and the isotopes of dissolved sulfates (i.e., 34S and 18O). Traditionally, the Sierra de Cañete aquifer has been divided into six sectors. Hydro-chemical and isotopic characterization differentiated between two large areas in the carbonate aquifer. The southern part presents younger water that is the result of faster recharge and that shows a high level of karstification, while the northern area has a slower flow, and recharge is produced over several years. In addition, the northern part is hydraulically connected to an alluvial aquifer (i.e., Llanos de Almargen) that borders the Sierra de Cañete to the north. This aquifer has high levels of pollution due to agricultural and livestock activities carried out in the Llanos de Almargen area. This pollution is transmitted to the carbonate aquifer when groundwater depletion occurs. Therefore, the Sierra de Cañete GPZ needs to be extended to include the Llanos de Almargen aquifer. [ABSTRACT FROM AUTHOR]