Abstract: The effects of temperature acclimation and acute temperature variation on oxygen consumption were determined for the pleurocerid snail Lithasia obovata (Say, 1829), a prosobranch restricted to the Ohio River and its tributaries' main stems. Snails were divided into two treatment groups and acclimated to constant temperatures (either 15 or 25 °C). Following acclimation, oxygen consumption rates for each animal were recorded at both 15 and 25 °C. Oxygen consumption rates did not differ between the two treatments at either temperature. Lithasia obovata exhibits no metabolic temperature compensation, as determined by acclimation Q10 (Q10acc). Because of the thermal inertia of the Ohio River (which does not change more than 1 °C day1), L. obovata is not exposed to rapid, large changes in water temperature and, thus, has little need for adjusting to short-term changes in ambient temperatures. We then examined the published literature and compared the acute Q10 and Q10acc values of L. obovata and other...