Abstract
Phytoplankton samples were taken during several oceanographic cruises in the Mexican Pacific Ocean (1998–2000), following three different protocols of collection and analysis, and from the material we report six new records of planktonic dinoflagellates in the region. Two species, Asterodinium spinosum and Brachydinium capitatum, are unarmored, another species, Actiniscus pentasterias, has internal siliceous skeletons, whereas Thoracosphaera heimii usually develops a calcareous coccoid vegetative stage. Calciodinellum operosum produces calcareous cysts that were also found in this study, and Achradina pulchra has an internal skeleton of organic material. Three species, A. spinosum, B. capitatum and C. operosum, were represented by very few specimens, whereas all others were more frequent. Brief descriptions and illustrations of these species by light and scanning electron microscopy are provided. The methods and techniques to study this group have been diverse and useful in finding a greater diversity. The world distribution of the species recorded here is revised.
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