Synonyms in the area: Halicornaria longicauda —Ritchie 1909 [polyp];? Halicornaria pennatula —Maÿal 1973, 1983 [polyp]; Gymnangium longicaudum —Migotto et al. 2002 [polyp].
Distribution in South America: polyp—Atlantic Ocean, Brazil, at 8.67°S 35°W, at 18.24°S 37.97°W, at 18.64°S 39.57°W, at 22.87°S 41.94°W, at 23°S 44.46°W (Ritchie 1909; Maÿal 1973, 1983; Nogueira et al. 1997; Migotto et al. 2002; Grohmann et al. 2003; Miranda et al. 2015).
Habitat: polyp—from 19 to 65m depth, on “bottom deposit, coral” (Ritchie 1909:100; Maÿal 1983).