“…In this paper, we hypothesize that: (1) the preferred body temperature of P. tenebrosus ( T pref ) is correlated with its T o for locomotor performance, as postulated by the thermal coadaptation hypothesis (Huey & Bennett, 1987; Angilletta et al, 2006); (2) P. tenebrosus is capable of attaining high locomotor performance in the field by reaching and maintaining T pref in the field, as has been observed in other species of the genus (Corbalán, Debandi & Kubisch, 2013; Gómez Alés, Acosta & Laspiur, 2017; Vicenzi et al, 2017; Duran, Kubisch & Boretto, 2018); (3) the potential increase in temperature due to global warming will affect locomotor performance of the species, considering the narrow thermal performance breadth observed in other Phymaturus (Bonino et al, 2015a; Gómez Alés et al, 2018; Vicenzi et al, 2019), increasing their vulnerability to extinction. Consequently, we predict that the T o for locomotor performance will be included within the thermal preference range of the species, that P. tenebrosus is an efficient thermoregulator like other species of the genus, and that under a global warming scenario, locomotor performance will decrease, threatening the viability of the species.…”