Epiphytic Eunotia (Bacillariophyceae) on Podostemum from Santa Catarina, southern Brazil, including new observations on morphology and taxonomy of some rare recorded species

Abstract

) on Podostemum from Santa Catarina, southern Brazil, including new observations on morphology and taxonomy of some rare recorded species.http://dx.doi.org/10.1590/1676-06032014003414Abstract: Eunotia is a highly diverse diatom genus in the Neotropics. Considerable morphological variability of the valve showed in several species of the genus resulted in a quite confused taxonomy. Twelve Eunotia taxa attached to Podostemum spp. were investigated using the light microscopy (LM). Additionally, scanning electron microscopy (SEM) was used in order to investigate the fine morphology of most abundant taxa. Samples were collected from four rivers from the State of Santa Catarina between March 2009 and July 2010. The freshwater diatom flora from this south Brazilian state is poorly known in relation to its neighboring states. Eunotia biseriatoides has intermediate features between Eunotia and Perinotia, and the circumscription of these genera is discussed here. Eunotia odebrechtiana is very similar in morphology to E. biseriatoides, and the synonymy is proposed, as well as the transfer of the variety E. odebrechtiana var. essequiboensis to the species E. biseriatoides. The fine structure of E. epithemioides is showed for the first time in SEM, revealing the unusual position of the rimoportula in this genus. A new variety, E. pseudosudetica var. rotundata var. nov., was proposed and compared with the typical one.Except by E. veneris, all other eleven taxa presented here are new records for the State of Santa Catarina, Brazil. Keywords: Diatom, Eunotiaceae, lotic systems, periphyton, taxonomy.CAVALCANTE, K.P., TREMARIN, P.I., CASTRO, E.C., TIBIRIÇ Á , C.E.J.A., WOJCIECHOWSKI, J., LUDWIG, T.A.V. Eunotia (Bacillariophyceae) epífitas sobre Podostemum em Santa Catarina, sul do Brasil, incluindo novas observações sobre a morfologia e taxonomia de espécies raramente registradas. Biota http://dx.doi.org/10.1590/1676-06032014003414Resumo: Eunotia é um gênero de diatomá ceas altamente diverso na regiã o neotropical. A considerá vel variabilidade morfoló gica encontrada nas valvas de vá rias espécies deste gênero resultam em uma taxonomia muito confusa. Neste estudo, 12 tá xons de Eunotia aderidos a Podostemum spp. foram investigados usando microscopia ó ptica (MO). Adicionalmente, microscopia eletrô nica de varredura (MEV) foi utilizada para investigar a morfologia ultraestrutural de tá xons mais abundantes. Amostras foram coletadas em quatro rios do Estado de Santa Catarina entre março de 2009 e julho de 2010. A diatomofló rula deste estado é pobremente conhecida em relaçã o aos estados vizinhos no sul do país. Eunotia biseriatoides é um taxon com características intermediá rias entre Eunotia e Perinotia e a circunscriçã o destes gêneros é discutida aqui. Eunotia odebrechtiana é muito similar morfologicamente a E. biseriatoides e a sinonimização é proposta, bem como a transferência da variedade E. odebrechtiana var. essequiboensis à espécie E. biseriatoides. A ultraestrutura de E. epithemioides é apresentada pela primeira vez em M...

Eunotia (Bacillariophyceae) from a subtropical stream adjacent to Iguaçu National Park, Brazil, with the proposition of a new species

“…Taxonomic remarks: The population of Eunotia pseudosudetica analyzed here is similar to type material from Uruguay (Metzeltin et al 2005) and to southern Brazilian specimens described and illustrated by Cavalcante et al (2014). Frequency of occurrence: common (Table 3).…”

“…rotundata was originally found in macrophyte samples collected in the state of Santa Catarina. The more rounded ends and less pronounced dorsiventrality distinguish this variety from the typical (Cavalcante et al 2014).…”

“…Other studies about diatom flora based on samples collected in the state of Paraná included 44 taxa (Tremarin et al 2008), 16 taxa (Marra et al 2016), 13 taxa (Bichoff et al 2016), 10 taxa (Fürstenberger & Valente-Moreira 2000), and 8 taxa (Bertolli et al 2010). Bicudo et al (1995) identified 14 taxa on samples from Mato Grosso wetland, Cavalcante et al (2014) found 12 taxa in the state of Santa Catarina, and Ferrari et al (2007) registered 23 species in amazonian water bodies.…”

“…Eunotia is one of the most common and species-rich diatom genera in the Neotropics (Patrick 1940a, 1940b, Hustedt 1952a, 1952b, 1965, Sala et al 2002a, 2002b, Faustino et al 2016, Costa et al 2017, with remarkable diversity in Brazilian acidic environments (Ferrari et al 2007, Bicca et al 2011, Canani & Torgan 2013, Dunck et al 2013a, 2013b, Cavalcante et al 2014). In the state of Paraná, the genus were reported by Ludwig & Valente-Moreira (1989), Fürstenberger & Valente-Moreira (2000), Tremarin et al (2008), Faria et al (2010), Bertolli et al (2010), Santos et al (2011), Bartozek et al (2013), Marra et al (2016), Silva-Lehmkuhl et al (2019), and Bartozek et al (2020) recently proposed a new species.…”