Rathkea formosissima (Browne, 1902)

Distribution in South America: medusa—Pacific Ocean, Chile, from 53°S to 55.84°S (Pagès & Orejas 1999; Palma et al. 2014a); Atlantic Ocean, Argentina, at Malvinas (Falkland) Islands, at Strait of Magellan, and at Beagle Channel (Browne 1902; Browne & Kramp 1939; Pagès & Orejas 1999; Genzano et al. 2008).

Habitat: medusa—subantarctic species apparently extending its distribution to temperate waters in the southern hemisphere (Pagès & Orejas 1999).