Movie 1.

Position and shape of the kidney of the Ruditapes. 3D reconstructed image of 3D T_1w-MRI of the clam incubated 30 μmol·l^-1 Mn²⁺ containing seawater shown in Fig. 1. The images are rotated in the dorsal-ventral axis of the clam. The first turn is images of all, the second turn is images of the kidney, the rectum and the digestive glands, and the third turn is image of the kidney alone that shown in Fig. 1C.