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Keywords
electron microscopy
morphological characters
new records
tychoplankton
How to Cite
Abstract
Diatoms are a successful taxonomic group of microbes, which exhibit a high diversity in marine habitats. Marine epibiont diatoms also display an important diversity of symbiotic associations. Net phytoplankton samples collected in the Mexican Pacific were analyzed, and apart from finding planktonic species, three epizoic diatom species were additionally observed: Protoraphis hustedtiana, Pseudohimantidium pacificum and Sceptronema orientale. The three species, usually found attached to copepods, were studied by light, scanning and transmission electron microscopy (ML, SEM and TEM), showing morphological characters such as shape of the valves, central (and sigmoid) sternum, fine striae, areolae shape, apical and aggregated rimoportulae, and slit fields at the apices (or poles). Morphological details found in Pseudohimantidium pacificum and in Sceptronema orientale include the type of velum in the areolae (rota type) and the external openings of the rimoportulae, respectively. Protoraphis hustedtiana and Sceptronema orientale are new records for the Mexican Pacific.References
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