Obelia

Obelia sp.

Remarks: the link between polyp and medusa stages of the species of Obelia is difficult to ascertain due to the absence of characters in distinguishing the medusa stages, which are usually identified simply as Obelia spp. (e.g., in Tronolone 2001, 2008). The distribution range provided by Ramírez & Zamponi (1981) is not based on specific records and, therefore, we did not consider that information for this species.

Distribution in South America: polyp—Atlantic Ocean, Brazil, from 23.50°S to 24°S, Argentina, at Mar del Plata coast (Shimabukuro 2007; Genzano et al. 2011);

medusa—Pacific Ocean, Chile, from 18.50°S to 56°S (Kramp 1966; Palma 1994; Palma & Rosales 1995; Pagès & Orejas 1999; Pagès et al. 2001; Palma & Apablaza 2004; Apablaza & Palma 2006; Galea 2007 p. 94–96; Galea et al. 2007a p. 161; Palma et al. 2007a, 2007b, 2014a; Villenas et al. 2009; Bravo et al. 2011); Atlantic Ocean, Brazil to Argentina, from 10°N to 0° (Equator), at Fernando de Noronha (no specific record), from 7.55°S to 8.7°S, from 22.9°S to 42.25°S (Vannucci 1957b, 1958, 1963; Alvariño 1968; Moreira 1973; Navas-Pereira 1974, 1980, 1981; Ramírez & Zamponi1980; Correia 1983; Zamponi 1983a; Tronolone 2001, 2008; Migotto et al. 2002; Nogueira Jr. 2012; Guerrero et al. 2013; Nagata et al. 2014a, 2014b; Gusmão et al. 2015; Nogueira Jr. et al. 2015a).

Habitat: polyp—on sponges (Shimabukuro 2007);

medusa—on surface plankton to 50m depth (Galea 2007 p. 94–96).