Ectocarpus filifer Børgesen, 1937a: 10–12, figs. 4, 5 (type locality: Mahabalipuram, near Madras, India).—K. Srinivasan, 1965: 242.— S. Dixit, 1966: 7.— Misra, 1966b: 80–82, fig. 35.— M. Balakrishnan & Kinkar, 1976: 129.
Feldmannia filifera (Børgesen) Pham-Hoàng Hô, 1969: 301, fig. 3.4.—Untawale, Dhargalkar, & Agadi, 1983: [18].— M. Balakrishnan & Kinkar, 1985a: 57–58, figs. 11–15.
INDIAN OCEAN DISTRIBUTION: India.
Note: The binomial Feldmannia filifera as used by Umamaheswara Rao & Sreeramulu (1964: 599) was invalid since they did not cite the basionym and thus failed to satisfy Art. 33.2. Those authors later (1970a) referred this species to F. irregularis (Kützing) G. Hamel.