Halimeda simulans Howe, 1907: 503–504, pl. 29 (type locality: Isla de Culebra, Puerto Rico).—Farghaly, 1980: 97, pl. XI: fig. 4.— Hillis-Colinvaux, 1980: 103, 105.— Huisman et al., 1990: 90.— Kendrick, Huisman, & Walker, 1990: 49.— Coppejans & Prud'homme van Reine, 1992a: 176.
Halimeda incrassata (Ellis) Lamouroux var. simulans (Howe) Børgesen, 1911: 144.—S. Qasim, Bhattathiri, & Reddy, 1972: 218, table 5.
INDIAN OCEAN DISTRIBUTION: Australia, eastern Indian Ocean, Indonesia (Sumba), Laccadive Islands, Tanzania.
Note: Tanzania is included in the distribution on the basis of specimens in UC collected by Papenfuss and Scagel and determined by Hillis-Colinvaux.