To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 1 Transverse HE images of the PFA fixed Nodularia douglasiae from the pedal sinus, Keber’s valve to the posterior end of the dorsoventral muscle. Twenty two images were obtained at 50 μm interval. Roles of Keber's valve and foot chamber for foot manipulation in the mussel Nodularia douglasiae Eriko Seo, and Yoshiteru Seo Biology Open 2018. 8:None-None; doi: 10.1242/bio.039859 Download Original Video