The scorpions of the Estación de Biología Chamela, Jalisco, Mexico with the description of a new species of Mesomexovis (Scorpiones, Vaejovidae) and an identification key

<i>Mesomexovis</i> Gonzalez-Santillan & Prendini, 2013 is a scorpion genus of the Vaejovidae family that comprises seven species, all endemic to Mexico. The present study describes a new species from Estación de Biología Chamela, Jalisco, related to <i>M.occidentalis</i> (Hoffmann, 1931), <i>M.atenango</i> (Francke & Gonzalez-Santillan, 2006), and <i>M.subcristatus</i> (Pocock, 1898). <i>Mesomexoviscaxcan</i> <b>sp. nov.</b> differs from these species in several respects. Firstly, the carinae of the pedipalp chelae are vestigial. Secondly, the ventral lateral carinae of metasomal segments I-IV are granular, and the ventral submedian carinae of segments I-IV are costate to granular. A microstructural separation between the subex and the basal carina of the capsular area of the hemispermatophore is described for the first time. <i>Mesomexoviscaxcan</i> <b>sp. nov.</b> represents the eighth species of the genus and the fifth reported in the Estación de Biología Chamela. The other scorpions identified in this location are <i>Centruroideschamela</i> Ponce-Saavedra & Francke, 2011, <i>C.elegans</i> (Thorell, 1876) (Buthidae), <i>Konetontlichamelaensis</i> (Williams, 1986), and <i>Thorelliusintrepidus</i> (Thorell, 1876) (Vaejovidae).