Synonyms in the area: Sertularella tenella —Jäderholm 1905; Ritchie 1907a; Blanco 1963 [non Sertularella tenella Alder, 1856] [polyp]; Sertularella microtheca Leloup, 1974 p. 30–31 [polyp]; Sertularella polyzonias var. robusta —Stepanjants 1979 [polyp].
Remarks: the species was recorded as Sertularella tenella from Tierra del Fuego, Burdwood Bank, and Santa Cruz by Jäderholm (1905), Ritchie (1907a), and Blanco (1963), respectively.
Distribution in South America: polyp—Pacific Ocean, Chile, from 41.81°S to 53.78°S (Leloup 1974 p. 30–31, 33; Galea 2007 p. 66–67; Galea et al. 2009a p. 340; Galea & Schories 2012a p. 24–25); Atlantic Ocean, Argentina, from 42°S to 56°S, and at South Georgia Island (Jäderholm 1905; Ritchie 1907a; Blanco 1963, 1968, 1976a, 1994a; Vervoort 1972; Stepanjants 1979; El Beshbeeshy 1991, 2011; Genzano & Zamponi 1997; Seo 2003; López-Gappa & Sueiro 2006).
Habitat: from 10 to 520m depth, on hydroids (Vervoort 1972; Leloup 1974 p. 30–31, 33; Blanco 1976a, 1994a; Stepanjants 1979; El Beshbeeshy 1991, 2011; Galea 2007 p. 66–67; Galea et al. 2009a p. 340).