Die Identitat von Gomphonema entolejum Ostrup (Bacillariophyceae) sowie Revision ahnlicher Arten mit weiter Axialarea

Diatoms (Bacillariophyceae) of Iguaçu National Park, Foz do Iguaçu, Brazil

“…Th e terminology employed was that used by Round et al (1990) and Barber & Haworth (1981). Th e identifi cation of taxa was based on classic and recent works, including Krammer (2002), Metzeltin & Lange-Bertalot (1998, Metzeltin et al (2005), Reichardt (2005) and Siver et al (2005).…”

“…Subsequently, Ludwig & Flôres (1995 conducted surveys in rivers in the areas near the Segredo hydroelectric plant, and Brassac et al (1999) identifi ed centric diatoms in rivers in the region surrounding the Salto Caxias hydroelectric plant. Later, Brassac & Ludwig (2003, 2005 conducted a survey of the pennate diatoms of the Iguaçu River and of some tributaries in the Salto Caxias hydroelectric plant region. In the most recent taxonomic study of the Iguaçu River basin (in the Maurício River), Tremarin et al (2009a) identifi ed 19 taxa of Gomphonema Ehrenberg and one of Gomphosphenia Lange-Bertalot.…”

New Freshwater Gomphonemoid Diatoms from Streams in the Sierra Nevada Mountains, California, USA

“…In G. serrianum the volae extend over the opening and off the surface of the valve (e.g. Figs 43, 45 this study), a feature observed by Reichardt 2005 in G. moresbyanum Reichardt (2005), but missing in other species with wide axial areas (Metzeltin & Lange-Bertalot 1998;Kociolek et al 2016). Any phylogenetic (versus ecological) significance of this feature awaits future research.…”

“…For Gomphonema, the areolar structure of G. sierrianum is very similar to other species with wide axial area. Reichardt (2005) has showed species with wide axial areas that also possess not only external volae (flaps) (similar to many other Gomphonema species; e.g. Levkov et al 2016), but the volae cover most of the opening of the areolae (leaving a very narrow, c-shaped slit).…”

“…, and pH 7.6-8.8 (see Table 1). Comments: -The group of Gomphonema species with wide axial areas was reviewed by Reichardt (2005), where he documented 14 taxa with light and scanning electron microscopy. Many of these taxa were from Africa, Southeast Asia and Australasia.…”