Ectocarpus columellaris Børgesen, 1936: 71–73, fig. 4 (type locality: Galle, Sri Lanka).—Misra, 1966b: 83–84, fig. 37.— Misra, 1967: 232.— S. Dixit, 1968: 16.— V. Krishnamurthy & H. Joshi, 1970: 9.— M. Balakrishnan & Kinkar, 1976: 129.— Untawale, Dhargalkar, & Agadi, 1983: [17].
Feldmannia columellaris (Børgesen) Islam, 1976: 32, pl. 22: figs. 150, 151; pl. 28: figs. 186–188.—Hadi et al., 1993: 126, figs. 25–27, 72–74.
Hecatonema columellare (Børgesen) M. Balakrishnan & Kinkar, 1981: 23–24, figs. 24, 111–114 (`columellaris').—Untawale, Dhargalkar, & Agadi, 1983: [19], [25].— M. Balakrishnan & Kinkar, 1985a: 59, 61, figs. 21–25.
INDIAN OCEAN DISTRIBUTION: Bangladesh, India, Iraq, Sri Lanka.