Abstract
A new species Surirella caljoniana sp. nov. is described from a unique microenvironment in the mountainous region of Türkiye. The taxon was found in a small soda spring which is an important water source for the Kızılırmak River. Surirella caljoniana is similar to Surirella brebissonii Krammer & Lange-Bertalot, S. brebissonii var. kuetzingii Krammer and Lange-Bertalot, S. lacrimula J.D.English, S. neglecta Reichardt and S. subsalsa W.Smith in morphology and shape. Unlike the other taxa, S. caljoniana has an oval-elliptic, slightly heteropolar outline, larger length/width ratio and a narrowly rounded, slightly protracted foot pole. Over the striae, distinct fimbriate silica protrusions are evident and similar to some marine species within the Pinnatae.
References
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Cocquyt, C. (2000) Biogeography and Species Diversity of Diatoms in the Northern Basin of Lake Tanganyika. Advances in Ecological Research 31: 125–150. https://doi.org/10.1016/S0065-2504(00)31010-8 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Cocquyt, C., Jüttner, I. & Kusber, W.H. (2013) Reinvestigation of West African Surirellaceae (Bacillariophyta) described by Woodhead & Tweed from Sierra Leone (West Africa). Diatom Research 28: 121–129. https://doi.org/10.1080/0269249X.2012.752411</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Cocquyt, C. & Taylor, J.C. (2015) New and interesting Surirella taxa (Surirellaceae, Bacillariophyta) from the Congo basin (DR Congo). European Journal of Taxonomy 133: 1–15. https://doi.org/10.5852/ejt.2015.133 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Cocquyt, C., Taylor, J.C. & Kusber, W.H. (2017) Reinvestigation of African Surirella taxa (Bacillariophyta) described by B.J. Cholnoky with some remarks on digitization of diatom types. Fottea 17: 34–56. https://doi.org/10.5507/fot.2016.012 </span></span></span>
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Cvetkoska, A., Levkov, Z. & Hamilton, P.B. (2014) Surirella subrotunda sp. nov and Surirella parahelvetica sp. nov., two new diatom (Bacillariophyta) species from Lake Prespa, Macedonia. Phytotaxa 156: 145–155. https://doi.org/10.11646/phytotaxa.156.3.5 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Cvetkoska, A., Hamilton, P.B. & Levkov, Z. (2015) Surirella prespanensis sp. nov. and Surirella hinziae sp. nov., two new diatom (Bacillariophyceae) species from ancient Lake Prespa (Macedonia/Albania/Greece). Fottea 15: 179–189. https://doi.org/10.1080/0269249X.2006.9705650 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">English, J.D. & Potapova, M.G. (2012) Ontogenetic and interspecific valve shape variation in the Pinnatae group of the genus Surirella and the description of S. lacrimula sp. nov. Diatom Research 27: 9–27. https://doi.org/10.1080/0269249X.2011.642950 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Foged, N. (1981) Diatoms in Alaska. Bibliotheca Phycologica 53: 1–317.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Guiry, M.D. & Guiry, G.M. (2022) AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Available from: http://www.algaebase.org (searched 14 December 2022) </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ferreira, T. & Rasband, W. (2012) ImageJ user guide. U.S. National Institute of Health, 185 pp.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hustedt, F. (1942a) Süßwasserdiatomeen des indomalayischen Archipels und der Hawaii-Inseln. Internationale Revue der gesamten Hydrobiologie 42: 1–252. https://doi.org/10.1002/iroh.19420420102</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hustedt, F. (1942b) Diatomeen. In: Huber Pestalozzi, G. (Ed.) Das Phytoplankton des Süsswasssers. Binnengewasser 16: 364–549.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Jahn, R., Kusber, W.-H., Cocquyt, C. (2017) Differentiating Iconella from Surirella (Bacillariophyceae): typifying four Ehrenberg names and a preliminary checklist of the African taxa. PhytoKeys 82: 73–112 https://doi.org/10.3897/phytokeys.82.13542 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Karthick, B., Hamilton, P.B. & Kociolek, J.P. (2012) Taxonomy and biogeography of some Surirella Turpin (Bacillariophyceae) taxa from Peninsular India. Nova Hedwigia 141: 81–116.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kociolek, J.P., Blanco, S., Coste, M., Ector, L., Liu, Y., Karthick, B., Kulikovskiy, M., Lundholm, N., Ludwig, T., Potapova, M., Rimet, F., Sabbe, K., Sala, S., Sar, E., Taylor, J., Van de Vijver, B., Wetzel, C.E., Williams, D.M., Witkowski, A., Witkowski, J. (2022) DiatomBase. Available at: https://www.diatombase.org (accessed 14 December 2022) https://doi.org/10.14284/504</span></span></span>
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kützing, F.T. (1844) Die Kieselschaligen Bacillarien oder Diatomeen. W. Köhne, Nordhausen, 152 pp., 20 pls. https://doi.org/10.5962/bhl.titke.64360</span></span></span>
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