Preface Götz B. Reinicke, Sabine Holst, André C. Morandini and Hjalmar Thiel 1. Max Egon THIEL’s monographs on Scyphozoa (Cnidaria) and a left-behind typescript on the Rhizostomeae Götz B. Reinicke, Sabine Holst, André C. Morandini, Ilka Sötje, Ilka Straehler-Pohl, Amanda A. Wiesenthal, and Hjalmar Thiel 2. Morphology of Rhizostomeae jellyfishes: what is known and what we advanced since the 1970s André C. Morandini 3. Approaches and findings in histological and micromorphological research on Rhizostomeae Sabine Holst, Gisele R. Tiseo, Nicolas Djeghri, and Ilka Sötje 4. Life cycles and reproduction of Rhizostomeae Agustín Schiariti, Sabine Holst, Gisele R. Tiseo, Hiroshi Miyake and André C. Morandini 5. Physiology and functional biology of Rhizostomeae jellyfish Renato M. Nagata, Isabella D’Ambra, Chiara Lauritano, Guilherme M. von Montfort, Nicolas Djeghri, Mayara A. Jordano, Sean P. Colin, John H. Costello, and Valentina Leoni 6. Morphological and molecular data in the study of the evolution, population genetics and taxonomy of Rhizostomeae Edgar Gamero-Mora, Jonathan W. Lawley, Maximiliano M. Maronna, Sérgio N. Stampar, Adriana Muhlia-Almazan, and André C. Morandini 7. Ecology of Rhizostomeae Delphine Thibault, Zafrir Kuplik, Laura Prieto, Michael Brown, Shin Uye, Tom Doyle, Kylie Pitt, William Fitt, Mark Gibbons and Angelica Enrique-Navarroc 8. Rhizostomes as a resource: The expanding exploitation of jellyfish by humans Lucas Brotz, Dror L. Angel, Isabella D’Ambra, Angélica Enrique-Navarro, Chiara Lauritano, Delphine Thibault, and Laura Prieto