Synonyms in the area: Campanularia prolifera Meyen, 1834 [polyp]; Obelia geniculata f. typica —Hartlaub 1904 p. 6 [polyp]; Obelia geniculata var. subsessilis Jäderholm, 1904b p. 2–3 [polyp]; Laomedea geniculata —Leloup 1974 p. 19–21; Wedler 1975 [polyp].
Distribution in South America: polyp—Pacific Ocean, Ecuador, from 0.35°N to 1.24°S in Galápagos Archipelago, Peru, at 12.01°S 77.21°W in Callao, at 15.33°S 75.16°W in Bahia San Juan (Fraser 1938a, 1938b, 1939; Calder et al. 2003); Chile, from 22.08°S to 55.37°S (Jäderholm 1904b p. 2–3; Hartlaub 1904 p. 6, 1905 p. 581–582; Nutting 1915 p. 73–76; Leloup 1974 p. 19–21; Orejas et al. 2000; Galea 2007 p. 93–94; Galea et al. 2007a p. 161, 2007b p. 312, 2009a p. 323); Atlantic Ocean, Colombia, from Santa Marta to Bahia Honda coast, Brazil to Argentina, at 9.80°S 35.80°W, from 20°S to 28.77°S, from 32°S to 56°S, at Tierra del Fuego, at Malvinas (Falkland) Islands and at South Georgia Island (Meyen 1834; Allman 1888; Versluys 1899; Hartlaub 1904, 1905; Jäderholm 1903, 1905, 1910; Vannucci Mendes 1946; Vannucci 1949, 1950, 1951a; Blanco 1964; Wedler 1975; Blanco & Morris 1977; Bandel & Wedler 1987; El Beshbeeshy 1991, 2011; Genzano et al. 1991; Haddad 1992; Migotto 1996; Genzano & Zamponi 1997; Grohmann 1997, 2006; Grohmann et al. 1997, 2003; Haddad & Chiaverini 2000, abstract; Haddad et al. 2000, abstract; Migotto et al. 2002; Oliveira 2003; Seo 2003; Oliveira et al. 2006; Menon et al. 2006, abstract; Bornancin 2008; Oliveira & Marques 2007, 2011; Shimabukuro 2007; Maronna et al. 2008, abstract; Silveira & Morandini 2011; Miranda et al. 2011, 2015; Marques et al. 2013);
medusa—Atlantic Ocean, Brazil, at 20.550°S 40.233°W, at 20.833°S 40.000°W, at 24.183°S 46.783°W, at 25.833°S 48.583°W (Vannucci 1951a).
Habitat: polyp—from intertidal zone to 1200m depth, on Macrocystis pyrifera, carapace of Eurypodius latreillii, mussels, hydroids (Allman 1888; Versluys 1899; Hartlaub 1904 p. 6; Jäderholm 1904b p. 2–3; Fraser 1938a, 1938b; Vannucci Mendes 1946; Vannucci 1949; Leloup 1974 p. 19–21; Blanco & Morris 1977; Bandel & Wedler 1987; El Beshbeeshy 1991, 2011; Haddad 1992; Migotto 1996; Haddad & Chiaverini 2000; Calder et al. 2003; Oliveira 2003; Oliveira et al. 2006; Grohmann 2006; Menon et al. 2006; Bornancin 2008; Galea 2007 p. 93–94; Oliveira & Marques 2007, 2011; Shimabukuro 2007; Miranda et al. 2011).
Obelia longa Stechow, 1921 c
Distribution in South America: polyp—Atlantic Ocean, Argentina, at 39.03°S 55.65°W, at 46°S 66°W (Genzano et al. 1991, 2009a; Genzano & Zamponi 1997, 2003; Zamponi et al. 1998).
Habitat: from 87 to 200m depth (Zamponi et al. 1998; Genzano et al. 1991, 2009a; Genzano & Zamponi 2003).