The ninth volume of this series Acarorum Catalogus is devoted to the Superfamily Shizoglyphoidea (Schizoglyphidae). Histiostomatoidea (Histiostomatidae, Guanolichidae). Canestrinioidea (Canestriniidae, Chetochelacaridae, Lophonotacaridae, Heterocoptidae). Hemisarcoptoidea (Chaetodactylidae, Hyadesiidae, Algophagidae, Hemisarcoptidae, Carpoglyphidae, Winterschmidtiidae). About 1268 species of 225 genera are listed therein, with synonymies and citations in various papers. The book also contains a list of by-country distributions, type localities, hosts of the parasitic species and lists of authors who published on any known species of these families.