To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Supplementary Movie 3 Coaptation of the left and right edges of the gills are shown in the movie. Posterior, left and right body directions of the mussel are represented with red P, L and R letters, respectively. Coaptation location is shown with a red bracket symbol. Mytilus galloprovincialis as a smart micro-pump Fazil E. Uslu, and Kerem Pekkan Biology Open 2016. 5:1493-1499; doi: 10.1242/bio.021048 Download Original Video