Monostaechas quadridens (McCrady, 1859)

Synonyms in the area: Monostaechas fisheri —Vannucci 1949, 1950, 1951a [non Monostaechas fisheri Nutting, 1905] [polyp].

Distribution in South America: polyp—Pacific Ocean, Colombia, at 5.99°N 77.36°W in Port Utria, Ecuador, at 0.56°N 80.01°W in San Francisco Bay (Fraser 1938a, 1948); Atlantic Ocean, Brazil to Argentina, from 17.50°S to 24°S, from 27.19°S to 27.99°S, and from 38.13°S to 38.25°S (Ritchie 1909; Vannucci 1949, 1950, 1951a; Migotto 1996; Genzano et al. 2002, 2009a; Migotto et al. 2002; Genzano & Zamponi 2003; Grohmann et al. 2003, 2011; Shimabukuro 2007; Silveira & Morandini 2011; Miranda et al. 2015).

Habitat: polyp—from 3.5m to 250m depth, on the hydrocaulus of Ralpharia sanctisebastiani, rocks, sponge (Ritchie 1909; Fraser 1938a; Vannucci 1949; Migotto 1996; Genzano et al. 2002, 2009a; Shimabukuro 2007).