Hutchinsia tenella C. Agardh, 1828: 105 (type locality: Sicily).
Polysiphonia tenella (C. Agardh) Moris & De Notaris, 1839: 265.—Zanardini, 1872: 136.
Herposiphonia tenella (C. Agardh) Ambronn, 1880: 197.—Børgesen, 1932b: 130.— Børgesen, 1934b: 48.— Børgesen, 1936: 95–96.— Børgesen, 1939b: 131.— Børgesen, 1945: 40.— Newton, 1955b: 143.— Durairatnam, 1961a: 71, pl. XVIII: figs. 4, 5.— S. Dixit, 1966: 21.— Hollenberg, 1968c: 555–556, fig. 14.— Isaac, 1968: 5.— Umamaheswara Rao, 1969d: 48.— Umamaheswara Rao & Sreeramulu, 1970a: 43, fig. 49.— Rhyne, 1971: 59.— Islam, 1974b: 88 (`Heterosiphonia tenella').— Saenger, 1974: 22–23, fig. 11.— Umamaheswara Rao, 1974e: 67.— Sartoni, 1975: 299.— Jaasund, 1976: 129, fig. 261.— Sartoni, 1976: 137.— Hackett, 1977: 18.— Jaasund, 1977b: 411.— Farghaly, 1980: 165, pl. XXV: fig. 1.— Lawson, 1980: 50.— Untawale, Dhargalkar, & Agadi, 1983: [37].— Payri, 1985: 640.— Annapurna & B. Rao, 1989: 449–453, figs. 1, 2, tables 1, 2.— Coppejans & Gallin, 1989: 52, tables 4, 7.— Untawale, Reddy, & Ambiye, 1989: table 1.— King, Puttock, & Booth, 1991: 3.— Shameel & J. Tanaka, 1992: 53.— J. Tanaka & Shameel, 1992: 85, fig. 8.— Zvyagintsev & Ivin, 1992: tables 2, 3.— Kalugina-Gutnik, 1993: 56.
Herposiphonia secunda (C. Agardh) Ambronn forma tenella (C. Agardh) Wynne, 1985b: 173, 175, figs. 11, 12 (including Indian Ocean records).—Bolton & Stegenga, 1987: 175.— R. Anderson & Stegenga, 1989: 303.— Basson, Mohamed, & Arora, 1989: 38.— Bolton & Stegenga, 1990: 237.— Huisman et al., 1990: 97.— Kendrick, Huisman, & Walker, 1990: 52.— Basson, 1992: 227.— Kalugina-Gutnik, Perestenko, & Titlyanova, 1992: 21 (table 1).— Titlyanova, Perestenko, & Kalugina-Gutnik, 1992: 44.— Wynne, 1993: 16.— Ballesteros, 1994: 539.— Wynne, 1995: 307–308, figs. 57, 58.
INDIAN OCEAN DISTRIBUTION: Aldabra Islands, Australia, Bahrain, Bangladesh, Diego Garcia Atoll, India, Iran, Kenya, Madagascar, Malaysia, Maldives, Mauritius, Mozambique, Réunion, Seychelles (including Mahé Island), Singapore, Somalia, South Africa, Sri Lanka, Tanzania.
Note: Hollenberg (1968c: 556) reduced Herposiphonia secunda to the rank of a form of H. tenella. Because Hutchinsia secunda C. Agardh (1824: 149), the basionym of Herposiphonia secunda, is older than Hutchinsia tenella, the relationship of the two taxa was reversed by Wynne (1985b: 173).