The benthic algal flora reported for the Revillagigedo Islands compris
es 205 specific infraspecific taxa: 42 Chlorophyta, 29 Phaeophyta and
134 Rhodophyta. This insular flora shares 131 taxa (54%) with other re
gions of the Mexican Pacific and 74 (36%) are restricted apparently to
the islands. One hundred three taxa (50%) are shared with areas of th
e Mexican tropical Pacific, 69 (34%) with warm temperate Pacific Mexic
o and 66 (32%) with La Pat, the transitional zone between tropical and
warm temperate Pacific Mexico. Considering more general regions, the
Revillagigedo Islands flora includes apparently restricted distributio
n (34 spp., 16.6%), exclusively tropical (51 spp., 25%) and widely dis
tributed eastern Pacific (33 spp., 16%) taxa. Even though we consider
that the inventory of the Revillagigedo Islands and to a lesser degree
the eastern tropical Pacific flora is still incomplete and in need of
further taxonomic study, the floristic comparison shows a greater aff
inity of the Revillagigedo Islands flora with the Mexican tropical Pac
ific than with any other part of Mexico.