Chaetomorpha natalensis (Hering) De Toni forma exposita Børgesen, 1948: 6–8, fig. 1 (type locality: Îlot Brocus, Mauritius).
Chaetomorpha exposita (Børgesen) Dawson, 1954c: 3.
INDIAN OCEAN DISTRIBUTION: Mauritius.
Note: A previous publication of the combination Chaetomorpha exposita (Dawson, 1954b: 158) was invalid because the author did not cite the basionym and thus failed to satisfy Art. 33.2.