New species of the genus Encyonema (Cymbellales, Bacillariophyta) from the Descoberto River Basin, Central-western Brazil

Abstract

Two new species of Encyonema are described from Central-western Brazil, bringing the total number of species in this genus recorded in Brazil to 45. Encyonema menezesiae has lanceolate valves with the ends subcapitate to rostrate-capitate, whereas E. candangense has linear valves with indistinct ends. The two species show deep alveoli, linear foramina, and densely areolate striae. These characteristics, together with the narrow valves, distinguish E. menezesiae and E. candangense from related taxa. The new species occurred in slightly acid and mostly oligotrophic waters. Similar aquatic environments in this region are being drastically affected by the use of biocides and fertilizers for agriculture. The description of these two species and their ecological preferences may provide useful information for the preservation of aquatic systems and their communities in Brazil.

Update of the Brazilian floristic list of Algae and Cyanobacteria

“…(da Silva et al 2015) were described for For the Paraná hydrographic region while a species of Conjugatophyceae, Staurastrum Meyen ex Ralfs (Santos et al 2013) and a Cyanophyceae belonging to the genus Pannus Hickel (Malone et al 2014) were described for the Paraguay hydrographic region (pantanal of Nhecolândia, Mato Grosso do Sul state). For the Amazon hydrographic region the monotypic new genera Eunotioforma Kociolek & Burliga and Bicudoa C.E.Wetzel et al (Wetzel et al 2012a;Burliga et al 2013), as well as a species of Tursiocola R.W.Holmes et al (Wetzel et al 2012b) and another of Aulacoseira Thwaites (Tremarin et al 2013b) were described.…”

Morphology and distribution of Encyonema angustecapitatum Krammer species complex (Bacillariophyceae) with description of four new species from São Paulo, southeast Brazil

“…The biraphid diatom genus Encyonema Kützing (Cymbellales) has over 400 described taxa (Fourtanier & KoCioleK 2011); 17 species and 5 varieties were recorded for Brazil (eSKinazi-leça et al 2015), and five new taxa were recently described (treMarin et al 2011;Silva et al 2013a, b;Silva & Souza 2015;Marquardt et al 2016). Encyonema species are very common in freshwater benthic communities with low electrolyte content (round et al 1990;KraMMer 1997b).…”

Sellaphora tropicomadida sp. nov., a new freshwater diatom species (Bacillariophyta) from a tropical Brazilian reservoir

“…In Brazil, despite the increasing number of taxonomic studies in a number of published (e.g. Ferrari et al 2009Ferrari et al , 2014Garcia 2010;Wetzel et al 2010Wetzel et al , 2015Tremarin et al 2012Tremarin et al , 2013Tremarin et al , 2014Tremarin et al , 2015Tremarin et al , 2016Silva et al 2013;Marquardt and Bicudo 2014;Pereira et al 2014Pereira et al , 2015Talgatti et al 2014;Wetzel and Ector 2014;Almeida et al 2015Almeida et al , 2016Silva and Souza 2015;Wengrat et al 2015Wengrat et al , 2016Bertolli et al 2016;Marquardt et al 2016) and unpublished (e.g. master thesis and doctoral dissertations) articles on diatoms, no records of new Sellaphora species have been published.…”