Excirolana braziliensis Richardson is shown to be the senior synonym of Cirolana salvadorensis Schuster and C. koepckei Bott. The latter two species, incorrectly assigned to Cirolana, were formerly regarded as distinct and were separated on the basis of size-dependent characters. Sampling of sandy beaches along the eastern Pacific from Mexico to Chile (21 localities) and the western Atlantic from Mexico to Brazil, including the West Indies (20 localities), demonstrates that E. braziliensis is commonly the most abundant macroscopic organism present in this habitat. Marked differences in zonation of young and adults are illustrated from data in Panama.
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