Abstract
We describe Adlafia kociolekii sp. nov. from aerial habitats in Sikkim, India, a part of the Eastern Himalayas. The species is described based on light and scanning electron microscopic observations. The main diagnostic features include valves are clear elliptical, a narrow axial area at the centre, radiate to convergent striation, and distinctive Voigt discontinuity at both apices. In terms of ultrastructure, the features that identify this species as new are the internally presence of raphe on the elevated sternum, with distal raphe ends distinctly deflected to opposite sides of proximal ends, and distal ends terminating in long and thickened helictoglossae. The species was also recorded from wet walls and freshwater habitats of north-east India, in the present study. The morphological features of the species are compared with other closely similar taxa of Adalfia and other naviculoid genera.
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;">Chudaev, D., Jüttenr, I., Glushchenko, A., Kulikovskiy, M., Gurung, S. & Williams, D.M. (2020) On the geographical distribution of Navicula nielsfogedii J.C.Taylor & Cocquyt. Diatom Research 35: 185–192. https://doi.org/10.1080/0269249X.2020.1758794</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;">Das, S.K., Radhakrishnan, C., Kociolek, J.P. & Karthick, B. (2018) Three new species of Gomphonema Ehrenberg (Bacillariophyta), from Eastern Himalayas, with a note on the unique girdle band structure. Nova Hedwigia 147: 359–371. https://doi.org/10.1127/nova-suppl/2018/025</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Das, S.K., Radhakrishnan, C., Kulikovskiy, M., Glushchenko, A., Kociolek, J.P. & Karthick, B. (2020) Pinnularia sikkimensis sp. nov. (Bacillariophyceae), from Eastern Himalayas and its distribution in Southeast Asia. Phytotaxa 447: 163–175. https://doi.org/10.11646/phytotaxa.447.3.2</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Dhar, U. (2002) Conservation implications of plant endemism in high-altitude Himalaya. Current Science 82: 141–148. https://www.jstor.org/stable/24106104 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Glushchenko, A.M., Kociolek, J.P., Kuznetsova, I.V. & Kulikovskiy, M.S. (2020) Four new species from the diatom (Bacillariophyceae) genus Adlafia Moser, Lange-Bertalot & Metzeltin from waterbodies of Vietnam. PhytoKeys 162: 13–27. https://doi.org/10.3897/phytokeys.162.57657 </span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Gregory, W. (1856) Notice of some new species of British freshwater Diatomaceae. Quarterly Journal of Microscopical Society, new series 4: 1–14. https://doi.org/10.1242/jcs.s1-4.13.1</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: https://www.algaebase.org (accessed 24 March 2023).</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Jüttner, I., Gurung, S., Sharma, C., Sharma, S., de Haan, M. & Van de Vijer, B. (2010a) Morphology of new taxa in the Cymbella aspera and Cymbella neocistula groups, Cymbella yakii sp. nov. and Cymbella cf. hantzschiana from Everest National Park, Nepal. Polish Botanical Journal 55: 73–92.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ju?ttner, I., Krammer, K., Van de Vijver, B., Tuji, A., Simkhada, B., Gurung, S. & Cox, E.J. (2010b) Oricymba (Cymbellales, Bacillariophyceae), a new cymbelloid genus and three new species from the Nepalese Himalaya. Phycologia 49: 407–423. https://doi.org/10.2216/09-77.1</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Jüttner, I., Kociolek, J.P., Gurung, S., Gurung, A., Sharma, C.M., Levkov, Z., Williams, D.M. & Ector, L. (2018) The genus Gomphonema (Bacillariophyta) in Rara Lake, Nepal: taxonomy, morphology, habitat distribution and description of five new species, and a new record for Gomphoneis qii. Diatom Research 33: 283–320. https://doi.org/10.1080/0269249X.2018.1528182</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Jüttner, I., Williams, D.M., Gurung, S., Van de Vijver, B., Levkov, Z., Sharma, C.M., Sharma, S. & Cox, E.J. (2017) The genus Odontidium (Bacillariophyta) in the Himalaya – a preliminary account of some taxa and their distribution. Phytotaxa 332: 1–21. https://doi.org/10.11646/phytotaxa.332.1.1</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. (2021) DiatomBase. Adlafia G. Moser, H. Lange-Bertalot & D. Metzeltin, 1998. Available from: http://diatombase.org/aphia.php?p=taxdetails&id=601327 (accessed 24 March 2023)</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. & de Reviers, B. (1996) The diatom types of Emile Manguin. II. Validating descriptions and designation of types for the New Caledonia species. Cryptogamie, Algologie 17: 193–215.</span></span></span>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Krsti?, S.S., Pavlov, A., Levkov, Z. & Jüttner, I. (2013) New Eunotia taxa in core samples from Lake Panch Pokhari in the Nepalese Himalaya. Diatom Research 28: 203–217. https://doi.org/10.1080/0269249X.2013.782343</span></span></span>
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