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¹ Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas

The environmental contingency caused by the recent massive arrivals of pelagic sargasso(Sargassum natans and S. fluitans) on Mexico’s Caribbean coasts have given rise to several areas ofscientific research. Our work proposed identifying the diatom flora adhered to the thalli of thesetwo sargasso species collected on the coasts of Cancun, Isla Mujeres, and Puerto Morelos. Werecorded 184 diatom taxa (all illustrated) from 65 genera. Taxa from the genera Mastogloia (37),Cocconeis (11), Nitzschia (10), Diploneis (8), and Amphora (9) represented 41% of the total, while 38 ofthese genera were represented by a single species. In the total floristic count, 41 taxa occurredexclusively on S. fluitans, 52 exclusively on S. natans (22 and 28%, respectively) and 91 (49%) werefound on both. Species of Navicula were scarce, and Navicula barbara var. densestriata was heretransferred to the genus Lyrella (Lyrella barbara var. densestriata (Foged) López-Fuerte & SiqueirosBeltrones comb. nov.). Overall, 17 (9%) of the identified taxa were new recordings for Mexico’scoasts. Supporting the hypothesis proposed, the 37 Mastogloia taxa suggested a tropical affinity,while the high species richness denoted that the surfaces of both sargasso species constitutedfavorable substrata for the growth of diatom assemblages.

Palabras clave: Bacillariophyta; epiphytes; invasive species; new combination; New records

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