Polysiphonia crassicollis Børgesen, 1939b: 126–129, figs. 39, 40 (type locality: near Bushire [Bushehr], Iran).—Newton, 1955a: 101.— Newton, 1955b: 143.— S. Dixit, 1970: 124.— Nizamuddin & Gessner, 1970: 13, pl. 24: figs. 75–76.— Jaasund, 1976: 123, figs. 249A–C.— Basson et al., 1977: 154.— Jaasund, 1977b: 409–410.— Basson, 1979: 79, pl. XVI: figs. 93, 94.— Knutzen & Jaasund, 1979: 3.— Lawson, 1980: 58.— Zahid, Begum, & Nizamuddin, 1981: 213–214, figs. 42–45.— Banaimoon, 1986: 132, fig. 26.— D. Jones, 1986: 35, pl. 8.— Al-Hasan & W. Jones, 1989: 305, pl. 9: figs. 77, 78.— Basson, Mohamed, & Arora, 1989: 39.— Heiba, 1989: table 1.— Basson, 1992: 227.— Shameel & J. Tanaka, 1992: 54.— Anil Kumar & Panikkar, 1994: 55: figs. 9–11.— Ormond & Banaimoon, 1994: 119.
INDIAN OCEAN DISTRIBUTION: Bahrain, India, Iran, Kenya, Kuwait, Pakistan, Qatar, Saudi Arabia, Tanzania, Yemen.
Note: Jaasund (1977b: 410) treated Polysiphonia crassicollis and P. tuticorinensis Børgesen (1938) as synonyms, but incorrectly adopted the younger name.