Rhodoplexia preissii Harvey in W. Hooker, 1844: pl. DCXIII (type locality: Swan River Colony [Perth], Western Australia).
Haloplegma preissii (Harvey) Montagne, 1845: 149, footnote.—Sonder, 1848 [1846–1848]: 171.— Kützing, 1849: 672.— J. Agardh, 1851 [1851–1863]: 111.— Harvey, 1855b: 558.— Areschoug, 1856: no. 79.— Harvey, 1859a: pl. LXXIX.— Kützing, 1862: 19, pl. 62: figs. d, e.— Harvey, 1863: xlviii.— J. Agardh, 1876: 90–91.— Sonder, 1880: 12.— De Toni, 1903: 1366.— Lucas, 1909: 50.— Mazza, 1911 [1905–1918]: 67–70.— Weber-van Bosse, 1913b: 136.— Weber-van Bosse, 1914: 300.— De Toni & Forti, 1923: 53–54.— Jadin, 1935: 170.— Lucas & Perrin, 1947: 336, fig. 163.— V. May, 1965: 403.— S. Dixit, 1970: 123.— Kendrick, Walker, & McComb, 1988: 205, table 1.— Huisman et al., 1990: 96.— Huisman & Walker, 1990: 424.— Kendrick, Huisman, & Walker, 1990: 52.
Taxonomic synonyms:
Haloplegma preissii (Harvey) Montagne var. flabelliforme Harvey, 1859b: 330 (type locality: Georgetown, Tasmania).—Barton, 1903b: 164.
Haloplegma cornudamae Kützing, 1862: 19, pl. 63: figs. a–c (`cornu damae') (type locality: "Nova Hollandiae'').
Haloplegma preissii (Harvey) Montagne var. cornudamae (Kützing) Sonder, 1880: 12 (including Indian Ocean records).
INDIAN OCEAN DISTRIBUTION: Australia.
Note: Haloplegma preissii var. flabelliforme is included as a synonym on the authority of De Toni (1903: 1366), who also thought that H. preissii var. cornudamae (as forma cornudamae) differed little from the typical variety.