Katsushi Sakai, Ph.D. (1965) at the University of Kyushu, is Emeritus Prof. of Shikoku University, Tokushima, Japan. He has published extensively on decapod Crustacea, including ""Callianassoidea of the world"" (Crust. Monogr., 4 (Brill, 2005)) and ""Upogebiidae of the world"" (Crust. Monogr., 6 (Brill, 2006)).