This volume is dedicated to the memory of the eminent carcinologist Michael Turkay, of the Research Institute and Natural History Museum Senckenberg, Frankfurt am Main, Germany. It is a tribute to his outstanding international contribution to the study of decapod crustaceans. An extensive account of Michael's life and achievements is presented, along with thirty-one scientific papers by 62 of his friends and colleagues from around the world. The book's focus is almost entirely on decapod crustaceans, and covers a variety of topics, including taxonomy, systematics, zoogeography, morphology, palaeontology, genetics, general biology and ecology. Numerous new taxa are described from a number of marine and freshwater groups, including one new genus and 13 new species named in honour of Michael himself. The contents of this volume were originally published in 2017 in Crustaceana volume 90, issue 7-10.