Based on literature data only, it is not possible to estimate which of the many records of Gellius / Desmacella / Sigmadocia / Adocia / Hemigellius / Haliclona flagellifer ( a), vagabundus ( a), and edaphus ( a) (see above in the historic overview and in the Remarks sections of the species) are assignable to already named species. A non-exhaustive list of references to potential additional separate species is presented here, following the same geographic order as presented in this study.
(1) Andaman Sea, deep water (cf. Burton 1928)
(2) Southern Red Sea (cf. Burton 1959b)
(3) Kerguelen Islands (cf. Boury-Esnault & Van Beveren 1992)
(4) New Zealand (cf. Dendy 1924; Bergquist & Warne 1980)
(5) Antarctica (cf. Burton 1938; Göcke & Janussen 2013)
(6) South Africa, shallow water (cf. Samaai & Gibbons 2005)
(7) Namibia, deep water (cf. Uriz 1987, 1988)
(8) California, deep water (cf. Green & Bakus 1994)
(9) Baja California (cf. Dickinson 1945)
(10) Japan (cf. Hoshino 1981)
(11) Korea (cf. Sim & Kim 1988)