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

Abstract

This study aimed to document the Cosmarium (Desmiadiales, Zygnematophyceae) taxa at a subtropical stream located in an area adjacent to the Iguaçu National Park, an important environmental protection area in the further west of Paraná State. For this purpose, monthly samplings of periphytic material associated to Eleocharis minima Kunth were performed in the period of August 2012 to July 2013. This taxonomic inventory allowed the identification of 37 taxa at specific and infra-specific levels. There were 15 new records for Paraná State: Cosmarium bipunctatum Börgensen, C. clepsydra Nordstedt var. bicardia (Reinsch) Croasdale, C. crenatum var. crenatum Ralfs, C. difficile Lütkemüller var. dilatatum Borge, C. isthmochondrum var. isthmochondrum Nordstedt, C.obsoletum (Hantzsch) Reinsch var. obsoletum, C. ordinatum (Borge) West & West var. ordinatum, C.ornatum Ralfs var. ornatum f. ornatum, C. pseudoconnatum Nordstedt var. pluriradians Scott & Grönblad, C. pseudoretusum F. Ducell. var. pseudoretusum Krieger et Gerlof, C. pyramidatum var. borgei Krieger & Gerloff, C. regnellii var. minimum Eichler & Gutwinski, C. repandum var. minus (West & West) Krieger & Gerloff, C. securiforme Borge var. brasiliense Grönblad and C. variolatum var. variolatum Lundell.

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

“…Taxonomy comments: The individuals found in the present study were smaller than the ones described by Prescott et al (1981), with the following dimensions: L: 32-41 µm, W: 30-41 µm and I: 9-13 µm. However, the sizes documented in the present are in agreement with those described by Aquino et al (2016).…”

“…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.…”

Desmids (Zygnematophyceae) from the littoral zone of an urban artificial lake: taxonomic aspects and geographical distribution

“…L: 139 µm; W: 83.7 µm; I: 31 µm. Geographic distribution in the Paraná State: Aquino et al (2014Aquino et al ( , 2016 Basionym: Cosmarium pseudopyramidatum P. Lundell f. excavata Nordstedt., Acta Univ. Lund., 19: 13.…”

“…et al (1997);Cetto et al (2004);Silva & Cecy (2004);Bortolini et al (2010b);Menezes et al (2011b);Aquino et al (2014Aquino et al ( , 2016). Frequency of occurrence: Rare Cosmarium obsoletum (Hantzsch) Reinsch var.…”

“…L: 73.7-85.5 µm; W: 55-64.6 µm; I: 24.4-28.4 µm. Figure 22.Geographic distribution in the Paraná State: Felisberto & Rodrigues (2010a);Biolo et al (2013);Aquino et al (2014Aquino et al ( , 2016.…”