Cymbella balkii C.N.Solak, S.Blanco & N.Balkis-Ozdelice

Solak, Cüneyt Nadir, Balkis-Ozdelice, Neslihan, Yilmaz, Elif, Durmus, Turgay & Blanco, Saúl, 2021, Description of two new Cymbella (Bacillariophyta) species from Sakarbaşı spring, Turkey, Phytotaxa 484 (2), pp. 195-206: 197-199

publication ID 10.11646/phytotaxa.484.2.4

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scientific name

Cymbella balkii C.N.Solak, S.Blanco & N.Balkis-Ozdelice

sp. nov.

Cymbella balkii C.N.Solak, S.Blanco & N.Balkis-Ozdelice   , sp. nov. ( Figs 2–15 View FIGURE 2–7 View FIGURE 8–15 )

Description: Valves moderately dorsiventral, lanceolate, dorsal margin moderately arched, ventral margin straight or very slightly convex. Ends not protracted and bluntly rounded. Length 51.3–83.2 μm, breadth 11.0–13.2 μm, maximal length/breadth ratio 6.4 (n=46). Axial area moderately narrow, linear or slightly tapering towards the ends, both branches form an obtuse angle to each other. Central area slightly distinct on the dorsal side, more pronounced on the ventral side. Raphe not or only slightly ventrally displaced, distinctly to strongly lateral, becoming filiform near the distal and reverse-lateral near the proximal ends. Striae moderately to strongly radiate, becoming more radiate near the ends, distinctly, however very finely punctate. Commonly 4, sometimes also 3–5 isolated stigmata on the ventral side of the central nodule. In the SEM, 3–6 large elliptical stigma foramina and 1–4 smaller round stigma foramina. The small round pore foramina are arranged irregularly. Parallel arranged pore field alveoli only on the valve end. The margins of the stigma alveoli are provided with teeth-like structures. Striae in the middle 8–9/10 μm (dorsal) and 10–12 (ventral), becoming up to 14/10 μm towards the ends, puncta 24–28/10 μm.

Type:— TURKEY, Sakarbaşı, Eskişehir ( GPS 39°21’10.04’’N, 31°03’33.24’’E), 872 m a.s.l., collector: Cüneyt Nadir Solak 24.11.2019. Holotype: slide number 27354 (holotype designated here on Fig. 1 View FIGURE 1 ) in the collection of Andrzej Witkowski the University of Szczecin. GoogleMaps  

Isotype:— Slide no. TR_ ESK _Sakarbası_ Nov2019 _EPF deposited at Kütahya Dumlupınar University ( Turkey)   .

Etymology:— The species was dedicated to scuba diver Mr. Erkan BALK who helped to collect the samples.

Differential diagnosis:— Cymbella simonsenii Krammer   in Krammer & Lange-Bertalot (1985: 33), C. pervarians Krammer (2002: 58)   , C. percymbiformis Krammer (2002: 75)   , C. vulgata Krammer (2002: 55)   , C. alpestris Krammer (2002: 52)   and C. perparva Krammer (2002: 38)   are similar taxa.Among them, Cymbella simonsenii   and C. pervarians   are the most similar taxa with similar outline and ending. However, C. simonsenii   and C. percymbiformis   (> 14.0 µm) are wider while, C. pervarians   is narrower than C. balkii   (8.0–12.6 µm and 11.0–13.2 µm respectively). C. balkii   has higher stigmata number (3–6) than C. pervarians   and C. vulgata   (1 isolated stigma on the ventral side). Striae density is higher than C. alpestris   (<8) and also, bigger than C. vulgata   and C. perparva   (> 50 µm).

Distribution:— Observed only in the type locality.

Ecology:— The water temperature ranged from 21.4–22.9 oC, pH was 7.8–7.9, dissolved oxygen (DO) was 5.2– 6.1 mg /L and electrolytic conductivity was 545–575 µS/ cm-1.

Associated diatom flora:— Cymbella cymbiformis   (21.2%), Encyonopsis minuta Krammer & E.Reichardt   in Krammer (1997: 95) (10.5%), Amphora pediculus (Kützing) Grunow   [described as Cymbella pediculus Kützing (1844: 80)   ] (5.3%), Navicula cryptotenella Lange-Bertalot   in Krammer & Lange-Bertalot (1985: 62) (4.1%), Eunotia arcubus Nörpel & Lange-Bertalot   in Lange-Bertalot (1993: 24) (3.8%), Nitzschia gracilis Hantzsch (1860: 40)   (2.9%), Staurosira construens Ehrenberg (1843: 424) (2.5%), Pseudostaurosira brevistriata (Grunow) D.M. Williams & Round (1988: 276)   (2.2%), Staurosirella pinnata (Ehrenberg) D.M. Williams & Round (1988: 274)   (1.9%), unidentified species of Achnanthidium Kützing   , Brachysira Kützing   , Cocconeis Ehrenberg   , Pseudostaurosira D.M.Williams & Round   and Sellaphora Kützing   were the most frequent taxa in the sample.


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