Mussel shape analysis data for figures 1 and 5. There are four .obj files per treatment, one for each individual mussel as titled. The .obj file is a matrix of points in 3d (x,y,z) that make up the mussel with a color attached to each point. A simple triangulation of these 3d points creates the visualized surface of the mussel. These individual .obj files were compared across the experimental condition populations 380, 550, 750 and 1000 μatm pCO2, and 750 and 1000 μatm pCO2 + 2°C (n=4 per treatment). Each file name refers to the treatment, the .obj files are labelled for each individual mussel as mussel’treatment’_oo# where # represents the number of the individual mussel, and treatment is the CO2 concentration. The files were produced by Dimensional Imaging OBJ exporter