A new genus and species in the diatom family Eunotiaceae Kützing (Bacillariophyceae) from the Amazonian hydrographic region, Brazil

Abstract

A new genus of the diatom family Eunotiaceae Kützing is described along with a new species. Eunotioforma Kociolek & Burliga gen. nov. shares asymmetry about the apical axis with other members of the family (except Peronia de Brébisson & Arnott ex Kitton), and is distinguished from other genera in the family by having its raphe system almost entirely on the valve face and transapical striae interrupted near the center line of the valve. Eunotioforma mattogrossiana sp. nov. is described from the Do Sangue River, an oligotrophic and acidic stream situated in the State of Mato Grosso, Central Western region of Brazil. When compared with previously described taxa, the new species differs with respect to size, striae densities, areolar densities and an uncommonly high number of rimoportulae per valve. Seven other taxa are assigned to the new genus, and the systematic position of Eunotioforma and the evolution of the raphe within the family is discussed.

Valve ultrastructure of two species of the diatom genus Gomphonema Ehrenberg (Bacillariophyta) from Yunnan Province, China

“…Diversity of internal stigma openings of a magnitude similar to Gomphonema is shown in the genus Cymbella, another genus, like Gomphonema, with over 2,000 named taxa (Kociolek et al 2019). The diversity of features demonstrated in Gomphonema by a wide range of authors seems to suggest that genus is ripe for a major revision, as was done for Cyclotella sensu lato (Lowe 1975;Theriot et al 1987;Hakansson & Khursevich 1997;Khursevich & Kociolek 2002;Houk & Klee 2004;Khursevich & Kociolek 2012;Kociolek et al 2016b;Acs et al 2016;), Navicula sensu lato (Lange-Bertalot 2001), Eunotia sensu lato (Metzeltin & Lange-Bertalot 2007;Taylor et al 2014;Burliga et al, 2013;Wetzel et al 2012;Wetzel & Kociolek 2018) and Cymbella Krammer 1997Krammer , 1999Krammer , 2003Metzeltin et al 2009;Bahls 2015;Kapustin et al 2017).…”

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. A new species of Oocystis A.Braun (Ramos et al 2015) was described from the West Atlantic hydrographic region.…”

“…New occurrences and, more noticeably, the description of new taxa of microalgae were also a result of the increase in collection efforts, particularly the work regarding diatoms and cyanobacteria carried out by Wetzel et al (2012a, b), Gama Jr. et al (2012, Burliga et al (2013), Caires et al (2013), Santos et al (2013) and Tremarin et al (2013).…”

Eunotia enigmatica sp. nov., a new planktonic diatom from Brazil and the transfer of Fragilaria braunii Hustedt to the genus Peronia (Bacillariophyceae)

“…In recent years, many new taxa have been described and revisions have mainly focused on the diversity of the genus which has clearly been underestimated (Wetzel et al 2010(Wetzel et al , 2011Furey et al 2011;lange-Bertalot et al 2011;Burliga et al 2013;Pavlov & levKov 2013;PotaPova et al 2014;van de vijver et al 2014;KuliKovsKiy et al 2015).…”

“…theriot et al 2010). The relationships amongst its various members, however, are anything but settled (Williams & reid 2006;Burliga et al 2013). This certainly has consequences for the genera currently recognized, especially since there are still many species in need of description.…”