Microdictyon tenuius J. Gray, 1866a: 69 (type locality: near Jeddah, Saudi Arabia).—Iyengar & Ramanathan, 1941: 157–159, figs. 1–9, pl. III.— Chacko, Mahadevan, & R. Ganesan, 1955: 11.— Varma, 1961: 224.— S. Dixit, 1970: 107.— V. Krishnamurthy & H. Joshi, 1970: 8.— Untawale, Dhargalkar, & Agadi, 1983: [5].— Chennubhotla, Kaliaperumal, & Kalimuthu, 1987a: 102–103.— Untawale, Reddy, & Ambiye, 1989: table 1.— Kalimuthu, Kaliaperumal, & Ramalingam, 1992: 122.
Misapplied name:
Microdictyon agardhianum Decaisne, 1841: 115–117.—Dickie, 1877b: 7.— G. Murray, 1887: 40.— Børgesen, 1940: 25–28, fig. 7, pl. II: fig. 1.— Børgesen, 1946: 18.— Børgesen, 1954a: 5.— Umamaheswara Rao, 1969d: 38.— Umamaheswara Rao, 1972: 221, fig. 5.— Pichon, 1978: 150, 416.— Farghaly, 1980: 70.— Bandara et al., 1988: 212.— Jayasankar, Ramalingam, & Kaliaperumal, 1990: table 1.
INDIAN OCEAN DISTRIBUTION: India, Madagascar, Mauritius, Rodriguez Island, Sri Lanka.
Note: The nomenclature of this species, which is usually cited as Microdictyon tenuius (C. Agardh) Decaisne, is discussed in the appended Taxonomic and Nomenclatural Notes.