Resumen del producto

¹ Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas

From December 2016 to May 2017, 22 phytoplankton surface samples were collected with a 20-µm mesh net at three islands of the Archipiélago de Revillagigedo (Partida, Socorro and San Benedicto), Mexican Paci?c. The sites depth was approximately 20–80 m; the surface water temperature was 21–27 °C. The potentially toxic benthic dino?agellate Ostreopsis lenticularis was present in all the samples. Cells had a lenticular to broadly oval shape, 65–100 µm long and 50–80 µm wide. The taxonomy of the genus Ostreopsis has been unclear due to equivocal ascribing some taxonomic features among species. The identi?cation of specimens from the archipelago was made based on the most important taxonomic characteristics: the thecal plates, the presence of two types of thecal pores (larger and smaller), and the lack of cingulum undulation. The studied cells are compared with O. cf. siamensis, O. labens and O. marina. This is the ?rst record of the species in the archipelago waters.

Palabras clave: Epiphytic dino?agellates; Mexican Pacific; Microphytobenthos; Morphology; Ostreopsis lenticularis; Theca

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