Chaetomorpha spiralis Okamura, 1903a: no. 94; 1903b: 131–132 (type locality: Japan [Nemoto, Chiba Prefecture fide isotype in UC]).—W.R. Taylor, 1966a: 344.— R. Patel & Gajaria, 1979: 12.— Crane, 1981: 148, fig. 4.— Untawale, Dhargalkar, & Agadi, 1983: [9].— Gajaria & R. Patel, 1988: 5, figs. 12–14.— Phang & Wee, 1991: 57.— Naqvi et al., 1992: 131.— Sartoni, 1992: 299, fig. 5A.
Taxonomic synonym:
Chaetomorpha clavata Kützing var. torta Farlow ex Collins, 1909b: 323 (type locality: Pacific Beach, San Diego County, California, U.S.A.).
Chaetomorpha torta (Farlow ex Collins) Yendo, 1914: 264–265.—P. Anand, 1940: 6, 22, fig. 7.— E. Lewis, 1963c: 15, 16, 17, tables I–III.— Umamaheswara Rao & Sreeramulu, 1964: 600.— Salim, 1965: 194, 195.— S. Dixit, 1968: 13.— V. Krishnamurthy & H. Joshi, 1970: 4.— Umamaheswara Rao & Sreeramulu, 1970a: 26, figs. 3, 4.— R. Patel & Gajaria, 1979: 12.— Untawale, Dhargalkar, & Agadi, 1983: [9].— P. Subba Rao et al., 1985: 32.— Gajaria & R. Patel, 1988: 5, figs. 17–19, 25.— Shameel & J. Tanaka, 1992: 21.
INDIAN OCEAN DISTRIBUTION: India, Indonesia (Bali), Laccadive Islands, Malaysia, Pakistan, Somalia.
Note: The conspecificity of Chaetomorpha spiralis and C. torta was proposed by Abbott (1972: 259). Gajaria & R. Patel (1988: 6), on the other hand, distinguished between the two species.