Class [Cephalopoda] Cuvier, 1795 - cephalopods Subclass †Orthoceratoidea McCoy, 1844 1 Order †Orthocerida Kuhn, 1940 2 Order †Ascocerida Kuhn, 1949 3 Order †Dissidocerida Zhuravleva, 1964 4 Order †Bajkalocerida