Taxonomic novelties, new records, and rare species of desmids from the Chapada Diamantina region, Brazil Author Ramos, Geraldo José Peixoto Laboratório de Ficologia, Universidade Estadual de Feira de Santana, Av. Transnordestina, s / nº, Novo Horizonte, 44036 - 900, Feira de Santana, BA, Brazil Author Costa, Fabiana De Matos Laboratório de Ficologia, Universidade Estadual de Feira de Santana, Av. Transnordestina, s / nº, Novo Horizonte, 44036 - 900, Feira de Santana, BA, Brazil Author Santos, Maria Aparecida Dos Laboratório de Ficologia, Universidade Estadual de Feira de Santana, Av. Transnordestina, s / nº, Novo Horizonte, 44036 - 900, Feira de Santana, BA, Brazil Author Moura, Carlos Wallace Do Nascimento Laboratório de Ficologia, Universidade Estadual de Feira de Santana, Av. Transnordestina, s / nº, Novo Horizonte, 44036 - 900, Feira de Santana, BA, Brazil text Phytotaxa 2019 2019-02-04 391 3 185 196 http://dx.doi.org/10.11646/phytotaxa.391.3.2 journal article 10.11646/phytotaxa.391.3.2 1179-3163 13726470 Euastrum subtrilobulatum var. laeve Kurt Först. & F.Eckert (1964: 370) ( Figs 43–46 ) Cell dimensions: length 25–30 μm, breadth 20–23 μm, 4–5 μm isthmus Habitat characteristics: River; quiet and warm waters, associated to filamentous algae. Material examined: HUEFS 244148. Notes: Taxon rare, reported only from the type locality in Goiás State , in central-western Brazil ( Förster 1964 ). It differs from the nominate variety by semicells not having a central pore. Another striking feature of this taxon is its cell wall thickening, which is quite visible on the margins in frontal view.