Supplement to: Collard, Marie; Dery, Aurélie; Dehairs, Frank; Dubois, Philippe (2014): Euechinoidea and Cidaroidea respond differently to ocean acidification. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 174, 45-55, https://doi.org/10.1016/j.cbpa.2014.04.011