PT Journal
AU Tusset, AE
   Izabel Tremarin, P
   Rodrigues Maciel, GM
   Cavalcante, PK
   Ludwig, AT
   de Souza Cardoso, L
TI Three new Simonsenia species (Bacillariophyta) from Brazil
SO Fottea
PY 2024
BP 61
EP 72
VL 24
IS 1
DI 10.5507/fot.2023.009
DE Bacillariales; estuarine; freshwater; karstic; simonsenioid; South America
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.
ER