Amphinema rugosum (Mayer, 1900)

Distribution in South America: polyp—Atlantic Ocean, Brazil, at 23.83°S 45.42°W (Migotto 1996; Migotto et al. 2002; Shimabukuro 2007; Silveira & Morandini 2011; Miranda et al. 2015);

medusa—Pacific Ocean, Chile, from 41.50°S to 55.83°S in interior waters (Pagès & Orejas 1999; Palma et al. 2007b p. 80; Villenas et al. 2019; Bravo et al. 2011); Atlantic Ocean, Colombia to Argentina, at 14.35°N 75.83°W, at 23.83°S 45.42°W, and at Strait of Magellan (Kramp 1959a; Migotto 1996; Pagès & Orejas 1999; Migotto et al. 2002).

Habitat: polyp—in shallow waters, on barnacles (Migotto 1996; Shimabukuro 2007).