Sphaerococcus seminervis C. Agardh, 1821: pl. XVII (type locality: Cádiz, Spain).
Cryptonemia seminervis (C. Agardh) J. Agardh, 1846b: pl. XVII.—Weber-van Bosse, 1913b: 138.— Weber-van Bosse, 1914: 302.
INDIAN OCEAN DISTRIBUTION: Amirante Islands, Saya de Malha Bank.