A total of 23 macroalgal species were identified in Laguna Tampamachoc
o, Veracruz, Mexico: 9 Chlorophyceae, 2 Phaeophyceae and 12 Rhodophyce
ae. Algal richness per area is relatively higher (60-100 times) than i
n another coastal lagoon and one estuary of the area (Laguna Madre and
Tamiahua with 29 and 22 species respectively). We report the presence
of Phaeophyceae in this environment for the first time. The three sit
es have 58 species in total, twice the number reported from any other
North Atlantic estuarine region.