PT  - JOURNAL ARTICLE
AU  - Tusset, Eduardo Antonio
AU  - Izabel Tremarin, Priscila
AU  - Rodrigues Maciel, Maria Gabrielle
AU  - Cavalcante, Kaoli Pereira
AU  - Ludwig, Thelma A.V.
AU  - de Souza Cardoso, Luciana
TI  - Three new Simonsenia species (Bacillariophyta) from Brazil
DP  - 2024 Mar 27
TA  - Fottea
PG  - 61--72
VI  - 24
IP  - 1
AID - 10.5507/fot.2023.009
IS  - 18025439
AB  - 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.