Aim Biogeographical patterns within three classes, the E chinoidea, B ivalvia and G astropoda, were investigated in A ntarctic, sub‐ A ntarctic and cold‐temperate areas based on species occurrence data. Faunal similarities among regions were analysed to: (1) test the robustness of the biogeographical patterns previously identified in bivalves and gastropods; (2) compare them with the biogeographical patterns identified for ech...