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 Amphinema turrida ( Mayer, 1900 ) Figs 3 A-D Dissonema turrida Mayer, 1900: 44 , pl. 2 figs 3-4. – Mayer, 1910: 116 , pl. 10 fig. 1, pl. 22 fig. 1. Stomotoca turrida . – Mayer, 1915: 199 , pl. 1 fig. 1. Amphinema turrida . ‒ Schuchert, 2007: 312 , fig. 48. Examined material: 02-JUL-2018 ; 1 specimen photographed; approximately 6 mm ; not collected . Observations: Amphinema medusa, approximately 6 mm high, with elongated, folded gonads that extend along 5/6 of radial canals ( Fig. 3 A-B); manubrium about half the height of the subumbrella, simple cruciform mouth with a few folds; two opposite tentacles, long, hollow, base laterally compressed and clasping bell margin, no abaxial spur, large red abaxial ocellus; about 12 rudimentary bulbs on bell margin, each with a large, red ocellus ( Fig. 3B ). Adradial and interradial rudimentary bulbs bearing a thin cirrus originating in the middle of the bulb ( Fig. 3C ). Distribution: Florida and Bahamas ; Mediterranean; Torres Strait; Papua New Guinea ; Japan ; Pacific Side of Mexico; Chile ( Schuchert, 2007 ). Type locality: USA , Florida , Dry Tortugas archipelago. Remarks: Amphinema turrida has recently been redescribed and discussed by Schuchert (2007) . Most Pacific populations lack the cirri and their status needs to be re-evaluated using genetic data.