Valve morphology of the benthic diatom Fallacia marnieri (Manguin) Witkowski (Sellaphoraceae - Bacillariophyta)

Procopiak, Letícia Knechtel; Fernandes, Luciano F.

doi:10.1590/s1519-69842003000100015

Cited by 10 publications

(3 citation statements)

References 7 publications

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“…The taxonomy of this genus has been studied by Sabbe et al (1999) and Garcia (2003). There also have other reports of the genus Fallacia (Witkowski 1991, 1993, Witkowski et al 2000, Procopiak & Fernandes 2003, Mann & Stickle 2009, Rakowska 2010. Diatoms in the genus Fallacia have a well-developed finely porous conopeum, elevated silica structure on the mantle and intricate structure of the valve.…”

Section: Introductionmentioning

confidence: 98%

Auxosporulation, morphology of vegetative cells and perizonium of Fallacia tenera (Hust.) D.G. Mann (Bacillariophyceae)

Suzuki

Nagumo

et al. 2014

Phytotaxa

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Specimens of Fallacia tenera were collected from the surface sediment at in a river estuary in Japan. Auxosporulation occurred in a rough culture. Morphological structures of vegetative cells and auxospores were observed in detail. The vegetative cells have one H-shaped chloroplast. The striae were interrupted by two depressed lateral sterna internally and partly covered by a finely porous conopeum on the external surface. The lateral sterna and porous conopea formed two more or less curved longitudinal canals connecting with the exterior via opening pores on both sides of a terminal fissure. This combination of characteristics is unique to the genus Fallacia. The cingulum was composed of three bands, such as an open valvocupula and two comparatively thin pleurae. The two pleurae could be distinguished by the shape of their ligulae. The second band had a triangular ligula, whereas the ligula of the third band is arc-shaped. The auxosporulation was type IA1a in Geitler's classification. Two paired gametangia formed two anisogametes in each of them. Two auxospores formed in the thecae of the gametangia after a trans physiological anisogamy. The perizonium of the auxospore consisted of a set of transverse bands and five longitudinal bands. The primary transverse band was about twice wider than the secondary ones. The circular incunabular scales were present on the two terminals of the auxospore and on the surface of the primary transverse band. The primary longitudinal band had an acute terminal and was flanked by secondary longitudinal bands. Each side had two secondary longitudinal bands. All longitudinal bands were immediately beneath the transverse bands. Morphological comparison between Fallacia and Pseudofallaica, and the taxonomic position of F. tenera is also discussed.

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Section: Introductionmentioning

confidence: 98%

Auxosporulation, morphology of vegetative cells and perizonium of Fallacia tenera (Hust.) D.G. Mann (Bacillariophyceae)

Suzuki

Nagumo

et al. 2014

Phytotaxa

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“…The vast majority of studies are related to the description of new taxa and are focused on King George Island (Van de Vijver and Beyens 1996;Kawecka et al 1998;Lobo et al 1998;Procopiak and Fernandes 2003;Vinocur and Maidana 2010;Luo et al 2016;Kochman-Kędziora et al 2018), Peninsula Antarctica (Vinocur and Izaguirre 1994;Van de Vijver and Beyens 1996;Pizarro and Vinocur 2000;Mataloni et al 2005;Bonaventura et al 2006), Prince Edward Islands , Deception Island (Van de Vijver and Mataloni 2008; Kopalová et al 2015), Livingston Island (Van de Vijver et al 2009Zidarova 2010;Zidarova et al 2012; Van de Vijver and Kopalová 2014; Kopalová et al 2015), and James Ross Island (Esposito et al 2008;Kopalová et al 2011;Kopalová 2012;Kopalová et al , 2015Van de Vijver and Kopalová 2014;Hamsher et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Geographic distribution of epilithic diatoms (Bacillariophyceae) in Antarctic lakes, South Shetland Islands, Maritime Antarctica Region

Silva¹,

Oliveira²,

Alves³

et al. 2019

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Organisms adapt to the environment by establishing themselves in suitable locations. Adaptation to the harsh Antarctic environment is no different. In this work the communities of epilithic diatoms in ice-free areas of water systems of five Antarctic islands are studied. The samples were oxidized, and permanent sheets were later prepared for analysis of the material. They were examined using an optical microscope and mounted on stubs for identification of the taxon in an electron microscope. Fifty-nine species distributed in 28 genera were collected. Only four species were observed in all study areas. Deception Island had unique species in comparison with those on other islands. Knowing the diatom community is a first step in understanding the systems that they inhabit. The polar environment is challenging due to the difficulty of sampling and low diversity and abundance.

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“…Currently, there are 89 Fallacia species recognized (Guiry & Guiry 2018). Taxa ascribed to the genus Fallacia have been increasing recently with transfer and description of several new species (e.g., Sabbe et al 1999, Witkowski 1991, Procopiak & Fernandes 2003, Metzeltin et al 2005, Li et al 2015, Van De Vijver & Cox 2015, Genkal & Yarushina 2017,…”

Section: Introductionmentioning

confidence: 99%

Fallacia californica sp. nov. (Bacillariophyta), a new freshwater diatom species from streams in California, USA

Stancheva

Manoylov

2018

Phytotaxa

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Small naviculoid diatoms remain largely taxonomically unexplored in the United States, due to the inability for clear differentiation of unique characteristics under light microscope magnification during routine identification. In a recent study of benthic stream diatoms from California and as a part of taxonomy data quality assurance and quality control process it became evident that taxonomic reevaluation of a common Fallacia species is needed. A new small-celled Fallacia species is described here and compared to similar taxa. Nomenclatural and ecological discussions, based on historical and current literature, are presented for each taxon. Type materials were consulted for taxonomic evaluation and comparison. The new taxon is described with light microscopy and scanning electron microscopy. Fallacia californica could be distinguished from other small Fallacia species with coarse areolae by the unique combination of following features: 1) distinct lyre-shaped sternum, 2) asymmetrical central area, and 3) variable central striae with one to four inner areolae absent, and unilateral gap between the central striae on the mantle. The new freshwater species was distributed in warm alkaline waters with medium conductivity and elevated nutrients content.The majority of populations have been recorded in coastal streams, where they could be abundant, but the species could be scattered in other inland running waters as well.

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Valve morphology of the benthic diatom Fallacia marnieri (Manguin) Witkowski (Sellaphoraceae - Bacillariophyta)

Cited by 10 publications

References 7 publications

Auxosporulation, morphology of vegetative cells and perizonium of Fallacia tenera (Hust.) D.G. Mann (Bacillariophyceae)

Auxosporulation, morphology of vegetative cells and perizonium of Fallacia tenera (Hust.) D.G. Mann (Bacillariophyceae)

Geographic distribution of epilithic diatoms (Bacillariophyceae) in Antarctic lakes, South Shetland Islands, Maritime Antarctica Region

Fallacia californica sp. nov. (Bacillariophyta), a new freshwater diatom species from streams in California, USA

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Valve morphology of the benthic diatom Fallacia marnieri (Manguin) Witkowski (Sellaphoraceae - Bacillariophyta)

Cited by 10 publications

References 7 publications

Auxosporulation, morphology of vegetative cells and perizonium of Fallacia tenera (Hust.) D.G. Mann (Bacillariophyceae)

Auxosporulation, morphology of vegetative cells and perizonium of Fallacia tenera (Hust.) D.G. Mann (Bacillariophyceae)

Geographic distribution of epilithic diatoms (Bacillariophyceae) in&nbsp;Antarctic lakes, South Shetland Islands, Maritime Antarctica Region

Fallacia californica sp. nov. (Bacillariophyta), a new freshwater diatom species from streams in California, USA

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Geographic distribution of epilithic diatoms (Bacillariophyceae) in Antarctic lakes, South Shetland Islands, Maritime Antarctica Region