Rhizogeton nudus Broch, 1910

Synonyms in the area: Rhizogeton nudum —Genzano 1993, 1994; Genzano & Zamponi 1997, 2003; Genzano & Rodriguez 1998 [incorrect subsequent spelling] [polyp].

Distribution in South America: polyp—Atlantic Ocean, Argentina, at 38°S 57°W in Buenos Aires coast (Genzano 1993, 1994; Genzano & Zamponi 1997, 2003; Genzano & Rodriguez 1998; Genzano et al. 2009a; Miranda et al. 2015).

Habitat: polyp—at intertidal area, on colonies of other hydroid (e.g., Ectopleura crocea), bryozoans, sponges (Genzano 1993; Genzano & Zamponi 2003; Genzano et al. 2009a).