Boundary layer convective heating and thermoregulatory behaviour during aerial exposure in the rocky eulittoral fringe snail Echinolittorina malaccana

► We explore convective heating and thermoregulatory behaviour in littorinid snails ► The boundary layer air (BLA) significantly heated snails in direct sunlight ► BLA heating was partially relieved by changing shell posture (standing) ► Standing was only induced by exposure to a thermal gradient in the BLA