Sphaerococcus durus C. Agardh, 1822 [1822–1823]: 310–311 (type locality: Cádiz, Spain).
Gracilaria dura (C. Agardh) J. Agardh, 1842: 151.—J. Agardh, 1852 [1851–1863]: 589–590.— Dickie, 1874b: 193.— J. Agardh, 1876: 419–420.— De Toni, 1900: 442.— Børgesen, 1951: 41–42, pl. VII.— Børgesen, 1953: 41.— Børgesen, 1954a: 33.— Lawson, 1969: 333, 334, fig. 2.— V. Krishnamurthy & H. Joshi, 1970: 21.— Isaac, 1971: 17–18.— Subbaramaiah, 1971b: 21.— Hartnoll, 1976: 8.— Lawson, 1980: 47.— Untawale, Dhargalkar, & Agadi, 1983: [39].— V. Krishnamurthy & Rajendran, 1987a: 10, 14, fig. 7, table 1.— V. Krishnamurthy, 1989: figs. 2B, 8C.— Subba Rao et al., 1992: 182.— Jagtap, 1993: table I.
INDIAN OCEAN DISTRIBUTION: India, Kenya, Mauritius, Tanzania.