Valve morphology of some species of Haslea Simonsen (Bacillariophyta) from southern Brazil
Palabras clave:
diatom, marennine, southern Brazil, taxonomyResumen
In Brazil, only five species of Haslea Simonsen have been found, probably due to their rarity and extremely hyaline valve, though presenting relatively large dimensions. In this study, three species from different localities in southern Brazil were investigated using transmission electron microscopy. Haslea cf. karadagensis Davidovich, Gastineau & Mouget has several discrepant features compared to the original description of H. karadagensis, such as fewer longitudinal striae. The specimens found did not completely conform to the diagnosis of H. ostrearia (Gaillon) Simonsen, a very close species recorded previously in the region, since there are differences regarding transapical and apical axes. Our material of Haslea wawrikae (Hustedt) Simonsen fit the dimensions of valves found elsewhere, except for a slightly higher number of striae. The newly reported species Haslea nautica (Cholnoky) Giffen resembled the valve structure of H. wawrikae regarding longitudinal strips and areolae.
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