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 10.35929/RSZ.0049 172fa5c5-c0c4-4bd7-b710-d608237b8458 0035-418 5639938 Genus Pseudaegina Lindsay, 2017 Pseudaegina Lindsay, 2017 in Lindsay et al., 2017: 507 , type species Aegina rhodina Haeckel, 1879 by original designation. Diagnosis: Narcomedusae with interradial manubrial pouches which are subdivied by a short septum in the middle; with peripheral canal system; with primary perradial tentacles alternating with pairs of marginal pouches; tentacle roots recurved orally without penetrating deep into central mesoglea; manubrial pouches begin at points of origin of primary tentacles; deep peronial grooves lined with nematocysts below but not above points of origin of primary tentacles; without secondary tentacles on umbrella margin; without otoporpae.