Note
A taxonomic study on the marine diatoms from the southwestern coast of Puerto Rico is reported in this paper.
Three families of the suborder Biddulphiineae, with 3 subfamilies, 12 genera, 25 species, 1 variety and 6 forms were
observed. Three of these taxa have never been reported from the coast of Puerto Rico; five are new for Puerto Rico
and the Caribbean Sea and one is new for the Atlantic Ocean.
The best represented genera were Trigonium and Triceratium. Most of the identified species were cosmopolitan in
temperate-tropical waters and neritic.
A new form is described: Trigonium formosum, f. hexagonale and a new combination: Lampriscus shadboltianum
var. crenulata.