The following taxon apparently lies within the circumscription of Caulerpa mexicana but has not yet been transferred or reduced to synonymy:
Caulerpa crassifolia (C. Agardh) J. Agardh forma exposita Børgesen, 1954a: 6–8, figs. 1, 2 (type locality: Riambel, near Souillac, Mauritius).
INDIAN OCEAN DISTRIBUTION: Mauritius.