New records of Cosmarium Corda ex Ralfs (Desmidiaceae, Zygnematophyceae) in a tributary of the Itaipu Reservoir, Paraná, Brazil

Abstract

Th is work is part of a survey of the desmid fl ora in a tributary of the Itaipu Reservoir, in the state of Paraná, Brazil. Th e objective was to expand the knowledge base regarding the genus Cosmarium (Desmidiaceae, Zygnematophyceae). We conducted a qualitative analysis of 60 samples of phytoplankton, which were collected from along the banks of the São Francisco Falso River between July of 2003 and June of 2004. We identifi ed, drew, and described 18 taxa of Cosmarium. Of those 18 taxa, 8 represent new records for the state of Paraná: C. angulosum Bréb. var. angulosum, C. bireme Nordst. var. bireme, C. clepsydra Nordst. var. clepsydra, C. cf. galeritum Nordst. var. borgei, C. ginzbergeri, C. norimbergense Reinsch var. norimbergense, C. protractum (Nägeli) De Bary var. protractum, and C. rectangulare var. hexagonum (Elfving) G.S. West & West.

New records of Cosmarium Corda ex Ralfs in lotic environment, adjacent to the Iguaçu National Park, Paraná State, Brazil

“…The individuals found showed cell measurements a bit smaller than the ones recorded by Prescott et al (1981), such as: L: 30-35 μm, W: 27-30 μm and I: 7.5-11 μm, however all the other characteristics are in accordance with the description. Geographic distribution in the Paraná State: Bittencourt-Oliveira (1993), Silva & Cecy (2004), Biolo et al (2013), Menezes et al (2013) and Aquino et al (2014). Geographic distribution in the Paraná State: First record of the taxon.…”

“…obsoletum, has great morphological similarity with C. ralfsii Breb., differing only because of its lower cell size, and by having an apical margin retuse and strongly rounded. Geographic distribution in the Paraná State: Bittencourt-Oliveira (1993), Bortolini et al (2010b), Felisberto & Rodrigues (2010b) and Menezes et al (2011b Geographic distribution in the Paraná State: Cecy et al (1997), Felisberto & Rodrigues (2005a, Bortolini et al (2010a), Biolo et al (2013) and Menezes et al (2013).…”

“…For the Paraná State 26 studies have contributed to the desmids knowledge until the present moment: Bittencourt-Oliveira (1993a, b), Bittencourt-Oliveira & Castro (1993), Cecy (1993), Bittencourt-Oliveira & Mecenas (1994), Cecy et al (1997), Picelli-Vicentim (2001), Cetto et al (2004), Silva & Cecy (2004), Biolo et al (2008Biolo et al ( , 2013, Felisberto & Rodrigues (2007, Moresco et al (2009), Bortolini et al (2008Bortolini et al ( , 2009Bortolini et al ( , 2010a, Menezes et al (2011aMenezes et al ( , b, 2013, Aquino et al(2014) and Carvalho et al (2015). Among them, only four comprise exclusively the Cosmarium genus: Felisberto & Rodrigues (2010b), Menezes et al (2011b), Biolo et al (2013) and Carvalho et al (2015).…”

“…Among them, only four comprise exclusively the Cosmarium genus: Felisberto & Rodrigues (2010b), Menezes et al (2011b), Biolo et al (2013) and Carvalho et al (2015).…”

Periphytic Cosmarium (Zygnematophyceae, Desmidiaceae) in lentic environments of the Upper Paraná River floodplain: Taxonomy and ecological aspects

“…Digital images were made using a 14.0 MP LOPT14003 camera and Image-Pro Premier 9.1.4 software. Species were identified based on specialized literature such as Prescott et al (1981) and Lenzenweger (1999), as well as local references (Aquino et al, 2016;Biolo et al, 2013;Felisberto & Rodrigues, 2008). The identified species were described using taxonomic characteristics, ecological aspects, and their occurrence records in the Upper Paraná River floodplain.…”