Encoelium clathratum C. Agardh, 1823 [1822–1823]: 412 (including Indian Ocean record) (type locality: uncertain).—C. Agardh, 1824: 262.— Kützing, 1849: 552.— G. Martens, 1868: 70–71.
Asperococcus clathratus (C. Agardh) J. Agardh, 1848b: 75–76.—Grunow, 1867: 49.
Hydroclathrus clathratus (C. Agardh) Howe, 1920: 590.—Børgesen, 1937a: 25–26.— Børgesen, 1941: 62.— Stephenson, 1947: 299.— Børgesen, 1948: 49–50.— Zaneveld, 1952: 130.— Chacko, Mahadevan, & R. Ganesan, 1955: 11.— Newton, 1955a: 101.— Isaac, 1956a: 181.— Zaneveld, 1956: 15.— Isaac, 1958: 20.— Pocock, 1958: 25.— Zaneveld, 1959: 99–100.— Durairatnam, 1961a: 33.— E. Lewis, 1962b: 209.— Hodgkin & Michel, 1963: 129.— S. Dixit, 1966: 9.— Misra, 1966b: 121–126.— Sigee, 1966: 72.— Tsuda & Newhouse, 1966: 97.— Isaac, 1967: 78.— Misra, 1967: 232.— Womersley, 1967: 245.— W. Isaac & F. Isaac, 1968: 23, pl. 3: E.— Cabanis, Chabouis, & Chabouis, 1969: 309.— K. Srinivasan, 1969: 27, figs. 1–3, pl. XXVII.— Umamaheswara Rao, 1969d: 42.— V. Krishnamurthy & H. Joshi, 1970: 12.— Umamaheswara Rao, 1970a: 4, fig. 18.— Gopalakrishnan, 1971: table I.— J. Price, 1971: 167, 168, 170.— Rhyne, 1971: 55.— Umamaheswara Rao, 1972: 221, fig. 4.— Islam, 1974b: 86.— Moorjani, 1974: 26.— Durairatnam & Ragunathamuthaliar, 1976: table 1.— Islam, 1976: 44–45, pl. 42: fig. 249; pl. 45: fig. 262.— Jaasund, 1976: 47, fig. 96.— Basson et al., 1977: 130, 258, fig. 111.— Hackett, 1977: 28.— Jaasund, 1977d: 517.— Brown & Jarman, 1978: 1254.— Chauhan & Mairh, 1978: 34.— B. Mehta & Parekh, 1978: 251.— Nizamuddin & Begum, 1978: 324–325, pl. V.— Pichon, 1978: 176, 240, 415.— Basson, 1979: 57, pl. V: fig. 25.— Knutzen & Jaasund, 1979: 4.— Farghaly, 1980: 118.— Lawson, 1980: 24.— R. Parekh, Dave, & E. Lewis, 1980: table 1.— Seagrief, 1980: 23, fig. on pl. 5.— Chennubhotla, Kaliaperumal, & Kalimuthu, 1981b: 11.— R. Parekh et al., 1982: table 1 (`clathrus').— Gopinathan & Panigrahy, 1983: 50.— Untawale, Dhargalkar, & Agadi, 1983: [19].— Aleem, 1984: 921.— R. Parekh et al., 1984: table 1.— Untawale & Jagtap, 1984: 100 (table 1).— M. Dave & Chauhan, 1985: table 1.— Jagtap, 1985a: 46.— Payri, 1985: 640.— Shunula, 1985: 66, 68, table 1.— D. Jones, 1986: 31, pl. 6.— Chennubhotla, Kaliaperumal, & Kalimuthu, 1987a: 104–105, fig. 5A, pl. I:F.— Jagtap, 1987: table 1.— R. Parekh & Chauhan, 1987: table 1.— Umamaheswara Rao, 1987a: 21.— Womersley, 1987: 300, 302.— M. Begum & Khatoon, 1988: 300.— Kendrick, Walker, & McComb, 1988: 205, table 1.— Moorjani & Simpson, 1988: 19, pl. 35.— Basson, Mohamed, & Arora, 1989: 31.— Huisman et al., 1990: 92.— Huisman & Walker, 1990: 380.— Kendrick, Huisman, & Walker, 1990: 50, 53.— Yarish & Wamukoya, 1990: table 2.— Kamat et al., 1991: 54.— Kesava Rao & Untawale, 1991: 100.— Phang & Wee, 1991: 60.— Abbas, Basson, & Gamal El-Din, 1992: 63.— Basson, 1992: 221.— Basson & Abbas, 1992: 60.— M. Begum & Khatoon, 1992b: 28.— Coppejans & Prud'homme van Reine, 1992a: 180.— Kalimuthu, Kaliaperumal, & Ramalingam, 1992: 122.— Kalugina-Gutnik, Perestenko, & Titlyanova, 1992: 22 (table 1).— Kamat et al., 1992: table I.— Naqvi et al., 1992: 133.— Shameel & J. Tanaka, 1992: 40.— Titlyanova, Perestenko, & Kalugina-Gutnik, 1992: 44.— Jagtap, 1993: table I.— Jayasankar & Ramalingam, 1993: 42.
Hydroclathrus cancellatus Bory de Saint-Vincent, 1825: 419–420.—Harvey, 1855b: 536.— Harvey, 1859a: pl. XCVIII.— Montagne & Millardet, 1862: 21.— Harvey, 1863: xii.— G. Martens, 1868: 26.— Dickie, 1874b: 191.— Dickie, 1877b: 6.— Sonder, 1879: 80.— Sonder, 1880: 8.— Bornet, 1885: 17.— Mitchell, 1893: 53–56.— Möbius, 1893: 137.— Heydrich, 1894: 286.— De Toni, 1895b: 490–491.— Reinbold, 1895a: 25.— De Wildeman, 1897a: 164.— Piccone, 1901: 120.— Barton, 1903a: 479.— Reinbold, 1907: 565.— Lucas, 1909: 19.— Schröder, 1912: 297.— Weber-van Bosse, 1913a: 136.— Chowdhury, 1932: 294.— Børgesen, 1934b: 26.— Jadin, 1935: 159.— Purchon & Enoch, 1954: 58.— S. Dixit, 1966: 9.— Johnson, 1967b: fig. 3.
Asperococcus cancellatus (Bory de Saint-Vincent) Sonder, 1846 [1846–1848]: 156.
INDIAN OCEAN DISTRIBUTION: Aldabra Islands, Andaman Islands, Australia, Bahrain, Bangladesh, Diego Garcia Atoll, India, Indonesia, Kenya, Kuwait, Laccadive Islands, Madagascar, Malaysia, Maldives, Mauritius, Mozambique, Nicobar Islands, Pakistan, Réunion, Rodriguez Island, Saudi Arabia, Seychelles, Singapore, Somalia, South Africa, Sri Lanka, Tanzania.
Note: In the protologue of Encoelium clathratum, C. Agardh cited two collections by Gaudichaud ("Ravak'' [Rauki, Waigeo Island, Moluccas, Indonesia] and "Baie de Chien Marin'' [Shark Bay, Western Australia]) and a collection by Bory de Saint-Vincent from Belle-Île, near the coast of Brittany, Atlantic France, sent to Agardh under the name "Fucus clathratus, Bory msct.'' The Belle-Île collection was designated type (i.e. lectotype) by Howe (1920: 590). According to Bornet (1892: 249), however, the shells in the specimens labeled by Bory (in PC) do not match the fauna of the Brittany coast so that the provenance of the lectotype collection remains unknown. Hydroclathrus cancellatus Bory de Saint-Vincent is based solely on the Belle-Île collection.