Fottea 2024, 24(1):61-72 | DOI: 10.5507/fot.2023.009

Three new Simonsenia species (Bacillariophyta) from Brazil

Eduardo Antonio Tusset1, *, Priscila Izabel Tremarin2, Maria Gabrielle Rodrigues Maciel3, Kaoli Pereira Cavalcante4, Thelma A.V. Ludwig3, Luciana de Souza Cardoso1
1 Universidade Federal do Rio Grande do Sul, Instituto de Biociências, Departamento de Botânica, Porto Alegre, RS, Brasil; *Corresponding author e-mail: eduardotu7@gmail.com; https://orcid.org/0000-0002-2289-045X
2 Acqua Diagnósticos Ambientais Ltda., Curitiba, PR, Brasil
3 Universidade Federal do Paraná, Setor de Ciências Biológicas, Departamento de Botânica, Centro Politécnico, Curitiba, PR, Brasil
4 Centro de Ciências Agrárias e Biológicas, Universidade Estadual Vale do Acaraú, Campus Betânia, Sobral, CE, Brasil

The genus Simonsenia is characterized by the raphe system that opens into a longitudinal channel over a marginal keel, and small circular areolae, occluded by hymens. So far, the occurrence of Simonsenia species in Brazil is known only by two records of S. delognei, documented in light microscopy. Here, are described three new species of Simonsenia, one from karst freshwater environments and two from an estuarine stream. Also, we report S. delicatula for the first time to Brazil, in a lotic freshwater body. The new species are distinguished from each other and from similar Simonsenia taxa mainly due to size, valve contour, apices shape, morphology of transapical ribs, and number of areolae rows of the striae. This study is an important contribution to the taxonomy, diversity and distribution of the genus, still underestimated, especially in estuaries and karst of tropical regions.

Keywords: Bacillariales, estuarine, freshwater, karstic, simonsenioid, South America

Received: October 28, 2022; Revised: February 1, 2023; Accepted: April 14, 2023; Prepublished online: March 12, 2024; Published: March 27, 2024Show citation

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Tusset, E.A., Izabel Tremarin, P., Rodrigues Maciel, M.G., Cavalcante, K.P., Ludwig, T.A.V., & de Souza Cardoso, L. (2024). Three new Simonsenia species (Bacillariophyta) from Brazil. Fottea, 24(1), 61-72. doi: 10.5507/fot.2023.009
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