Eunotia genuflexa Noerpel-Schempp in Lange-Bertalot and Metzeltin 1996: p. 50, pl. 9/figs 14-17. *^

Bukhtiyarova, Lyudmila N., 2019, The genus Eunotia Ehrenb. (Bacillariophyta) in the Cheremsky Nature Reserve, Ukrainian Polissya, and refined terminology relevant to the raphe system morphology, PhytoKeys 128, pp. 1-31 : 8

publication ID

https://dx.doi.org/10.3897/phytokeys.128.35566

persistent identifier

https://treatment.plazi.org/id/140EBEEA-DD62-57BD-AF05-77396E4CBFCA

treatment provided by

PhytoKeys by Pensoft

scientific name

Eunotia genuflexa Noerpel-Schempp in Lange-Bertalot and Metzeltin 1996: p. 50, pl. 9/figs 14-17. *^
status

 

Eunotia genuflexa Noerpel-Schempp in Lange-Bertalot and Metzeltin 1996: p. 50, pl. 9/figs 14-17. *^ Figs 4-6b (SEM) View Figures 4–6b

Eunotia flexuosa f. beta A. Berg, 1939

Eunotioforma genuflexa ( Nörpel-Schemp) Kociolek & Burliga in Burliga et al. 2013

Illustrations.

Bąk et al. 2012: p. 132, pl. 17/1, 2, 5 exemplars from left to right; Kulikovskiy et al. 2016: p. 121, pl. 20/figs 10-14.

Diagnosis.

Morphometric data: length 70-120 µm; width cm2-3, p1.5-2 µm; striae density c20, p23 in 10 µm. Lange-Bertalot and Metzeltin 1996: length 70-160 µm, width 1.5-2.6 µm, striae density 19-23 in 10 µm.

Frustule bi-symmetric, bipolar, biraphid with mirror-symmetric, mantle-offset, brevisslit type of raphe. Valves slightly dorsiventral, with narrowed rounded poles. Striae basal, uniserial, distant, uniformly spaced along the valve (Figs 4a View Figures 4–6b , 5a View Figures 4–6b , 6a, b View Figures 4–6b ). Areolae small with round outer foramina. Raphe system consists of two short filiform slits on ventral valve mantle; tr-fissures long, broadly curved, sited on 0.5 of valve width along 4-5 striae, end up by round lacunae (Figs 4a View Figures 4–6b , 5a View Figures 4–6b , 6a View Figures 4–6b ).

Ecology.

Freshwater benthic species occurs in moderately acidic, dystrophic or oligosaprobic waters. Type location had extremely low concentration of inorganic nutrient and pH = 6.5 ( Lange-Bertalot and Metzeltin 1996).

Distribution.

EUROPE: Type location: Finland, Lake Julma Olkky ( Lange-Bertalot and Metzeltin 1996); Poland ( Bąk et al. 2012); Russia ( Kulikovskiy et al. 2016); Ukraine (present paper). In Ukraine. The Cheremsky Nature Reserve, tract Obkopane, Lake Redychi, epiphyton on Fontinalis sp.

Comments.

Specimens with straight valve outline and subcapitate poles presented in Costa (2015: p. 55, pl. 14/figs 1-11) differ from type population significantly, therefore the author has presented other species under this name. In Bąk et al. (2012) morphology of only three exemplars corresponds to type population.

Type species of the genus Eunotioforma Kociolek & Burliga is Eunotioforma mattogrossiana Kociolek, Burliga & Salomoni ( Burliga et al. 2013) has several characters that differ from the genus Eunotia : axial area on valve surface (= sternum), large heli ctoglossae, different number of rimoportulae (2-8 per valve), small granules along all striae which are not present in E. genuflexa . Strongly curved long tr-fissures are the only common character with a new genus and it can be found in some other species of Eunotia , for instance, E. flexuosa ( Bréb.) Kütz. ( Pavlov and Levkov 2013: pl. 7/fig. 2), E. macedonica Pavlov & Levkov ( Pavlov and Levkov 2013: pl. 10/fig. 2). The only one character is not enough for transferring of E. genuflexa to the genus Eunotioforma .

Kingdom

Plantae

Phylum

Bacillariophyta

Class

Bacillariophyceae

Order

Eunotiales

Family

Eunotiaceae

Genus

Eunotia

Loc

Eunotia genuflexa Noerpel-Schempp in Lange-Bertalot and Metzeltin 1996: p. 50, pl. 9/figs 14-17. *^

Bukhtiyarova, Lyudmila N. 2019
2019
Loc

Eunotioforma genuflexa

J.P.Kociolek & A.L.Burliga 2013
2013
Loc

Eunotia flexuosa f. beta

A.Berg 1939
1939