Modeeria rotunda (Quoy & Gaimard, 1827)

Synonyms in the area: Tiaranna rotunda —Kramp 1957 [medusa]; Stegopoma fastigiatum —Vervoort 1972; Leloup 1974 p. 7; Blanco 1994a [polyp].

Distribution in South America: polyp—Pacific Ocean, Chile, from 41.50°S to 53.78°S (Leloup 1974 p. 7; Galea 2007 p. 42–43; Galea et al. 2009a p. 346; Galea & Schories 2012a p. 23–25); Atlantic Ocean, Argentina, at 42.90°S 62.60°W and near to Malvinas (Falkland) Islands (Vervoort 1972; El Beshbeeshy 1991, 2011; Blanco 1994a);

medusa—Pacific Ocean, Chile, from 41.50ºS to 55.84ºS in interior waters (Pagès & Orejas 1999; Villenas et al. 2009; Bravo et al. 2011; Palma et al. 2014a); Atlantic Ocean, Argentina, at 43.34ºS 46ºW, at 54.48ºS 62.19ºW, and at Strait of Magellan (Kramp 1957; Pagès & Orejas 1999; Genzano et al. 2008a).

Habitat: polyp—widely distributed between boreal and subantarctic waters (Pagès & Orejas 1999), from shallow waters to 403m depth, on several species of hydroids (Vervoort 1972; El Beshbeeshy 1991, 2011; Blanco 1994a; Galea et al. 2009a p. 346).