To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 3. Mid-longitudinal T1w-MRI of heartbeat of Calyptogena okutanii measured every 1.28 s shown in Fig. 5A. A series of 173 images were obtained at 5 frames·s-1. Foot extension and retraction in the clam Calyptogena okutanii without any Keber's valve: an inflatable fastener bag model Eriko Seo, Kazue Ohishi, Yoshie Imaizumi-Ohashi, Mika Yokoi-Hayakawa, Tsuyoshi Yamaguchi, and Yoshiteru Seo Journal of Experimental Biology 2023. 226:None-None; doi: 10.1242/jeb.244857 Download Original Video