Goniolithon notarisii (Dufour) Foslie forma propinquum Foslie, 1900a: 21–22 (`propinqua') (lectotype locality: St. Croix, Virgin Islands fide Woelkerling, 1993: 177).
Neogoniolithon propinquum (Foslie) Lemoine, 1966: 12.—Segonzac, 1984: table 1.
INDIAN OCEAN DISTRIBUTION: Comoro Islands.