“…Mexico also spans two major biogeographic regions (Nearctic and Neotropical) (Morrone, 2001(Morrone, , 2005(Morrone, , 2014 and encompasses a large area where the biota of the two regions mix: the Mexican Transition Zone (MTZ) (Halffter & Morrone, 2017). Fourteen smaller biogeographical provinces have also been delimited in Mexico (Morrone, 2017(Morrone, , 2019 and subsequently corroborated by biogeographical analysis of various groups including birds (Blancas-Calva et al, 2010), mammals (Escalante et al, 2004), reptiles (Salinas et al, 2019), plants (Contreras-Medina et al, 2007;Salinas-Rodríguez et al, 2018), freshwater fishes (Huidobro et al, 2006) and arthropods (Arriaga et al, 2012;Bizuet-Flores et al, 2015;Morrone, 2006). The MTZ is of particular interest because it harbours a mixture of Neotropical and Nearctic taxa with a wide range of environmental tolerances (Bryson et al, 2011;Corona et al, 2009;Gutiérrez-Ortega et al, 2018;Marshall & Liebherr, 2000;Morrone & Márquez, 2001).…”