Pond Snail Breathing (IMAGE) Society for Experimental Biology Caption The great pond snail (Lymnaea stagnalis) comes up to the surface to breathe through a rudimentary lung, open to the air via the pneumostome. Credit Ken Lukowiak Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.