Hydromedusae observed during night dives in the Gulf Stream Author Schuchert, Peter Muséum d’histoire naturelle, C. P. 6434, CH- 1211 Genève 6, Switzerland peter.schuchert@ville-ge.ch Author Collins, Richard 880 NE 33 rd Street, Boca Raton, Florida, USA rc6684@icloud.com text Revue suisse de Zoologie 2021 2021-10-21 128 2 237 356 journal article 3356 10.35929/RSZ.0049 172fa5c5-c0c4-4bd7-b710-d608237b8458 0035-418 5639938 8382D1CA-7C0E-4B1C-9591-4CEAA2F296FB Genus Melicertissa Haeckel, 1879 Melicertissa Haeckel, 1879: 135 ; type species Melicertissa clavigera Haeckel, 1879 by monotypy. Melicertella Haeckel, 1879: 134 ; type species Melicertella panocto Haeckel, 1879 by monotypy. Diagnosis: Medusae with eight unbranched radial canals; stomach with eight basal perradial stomach extensions, leaf-like; bulbs and cordyli with adaxial ocelli; with or without cirri. Hydroid Hebella like. Remarks: See Uribe-Palomino et al. (2018: 26 , table 1) for a synopsis of the species.