Note
A taxonomic study on the marine diatoms from the southwestern coast of Puerto Rico is reported in this paper.Two suborders of the order Centrales, with 6 families, 11 genera, 25 species, 3 varieties and 2 forms were observed.Nine of these taxa had never been reported from the coasts of Puerto Rico and one is new for Puerto Rico and theCaribbean Sea.The best represented genera were Coscinodiscus and Rhizosolenia. Most of the identified species were cosmopolitanand neritic, although oceanic and tychopelagic forms were also observed.