Hypnea nidulans Setchell, 1924: 161–162, fig. 30 (type locality: Tutuila Island, American Samoa).—Weber-van Bosse, 1928: 454–455, fig. 192.— Børgesen, 1943: 62.— Børgesen, 1950b: 17.— Børgesen, 1952: 27–28.— S. Dixit, 1968: 21.— Isaac, 1968: 4.— Jaasund, 1976: 97, fig. 197.— Jaasund, 1977c: 423.— Lawson, 1980: 51.— Moorjani, 1980b: 461.— Moorjani & Simpson, 1988: 30, pl. 62a.— Kalugina-Gutnik, Perestenko, & Titlyanova, 1992: 18 (table 1).— Titlyanova, Perestenko, & Kalugina-Gutnik, 1992: 43.— Jagtap, 1993: table I.— Kalugina-Gutnik, 1993: 55.— Ballesteros, 1994: 538.— Mshigeni & D. Chapman, 1994: 256.— Ballesteros & Afonso-Carrillo, 1995: 210.
INDIAN OCEAN DISTRIBUTION: Indonesia, Kenya, Mauritius, Seychelles.
Note: Lawson (1980: 51) incorrectly attributed a Somalian record of this species to Hauck (1887). According to Dawson (1961: 236–237), Hypnea nidulans is conspecific with H. pannosa.