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Encyonema aquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov.: two new freshwater diatom species (Cymbellales, Bacillariophyceae) from an oligotrophic reservoir in southeastern Brazil

Gisele Carolina Marquardt, Angélica Cristina Righetii da Rocha, Carlos Eduardo Wetzel, Luc Ector, Carlos Eduardo de Mattos Bicudo

Abstract


Recent research of the plankton and the surface sediments from Ribeirão do Campo reservoir (São Paulo, southeast Brazil) led to identification of two new cymbelloid diatom species: Encyonema acquasedis sp. nov. and Kurtkrammeria salesopolensis sp. nov. Their morphology was studied under both light and scanning electron microscopes aiming at describing the two species in detail. The morphology of each species is compared and discussed with morphologically similar taxa. The new species are different from all others in the Cymbellales due to a combination of characteristics including valve outline, striae, areolae structure, and raphe system. Both species were collected from an oligotrophic environment with both low pH and conductivity.


Keywords


Brazil, diatoms, Encyonema, Kurtkrammeria, new species, reservoir, São Paulo, taxonomy, Algae

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DOI: http://dx.doi.org/10.11646/phytotaxa.247.1.4

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ISSN 1179-3155 (print); ISSN 1179-3163 (online)

Published by Magnolia Press, Auckland, New Zealand