Abstract
Two new species of Meridion (Bacillariophyta, Tabellariaceae) are described from Unalaska Island (Aleutian Islands, USA) based on light and scanning electron microscope investigations. Meridion tenuipes sp. nov. is characterized by very slender valves with capitate headpole, lack of costae at the footpole and rimoportula positioned close to valve apex. Meridion humerosum sp. nov. possesses more robust valves with capitate poles, separated by distinct shoulders, costae distributed through the whole valve length and rimoportula displaced some distance from the apex. Comparison of these new species with other heteropolar representatives of the genus is provided. Our data indicate that the degree of Meridion endemism in North America is even higher than it was previously supposed.
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;">Brant, L.A. (2003) A new species of <em>Meridion</em> (Bacillariophyceae) from western North Carolina. <em>Southeastern Naturalist</em> 2 (3): 409–418. https://doi.org/10.1656/1528-7092(2003)002[0409:ANSOMB]2.0.CO;2</span></span></span></p>
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<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Ehrenberg, C.G. (1843) Verbreitung und Einfluss des mikroskopischen Lebens in Süd- und Nord-Amerika. <em>Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin</em> 1841: 291–445.</span></span></span></p>
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<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. <em>Bibliotheca Phycologica</em> 53: 1–317.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Gogorev, R.M., Chudaev, D.A., Stepanova, V.A. & Kulikovskiy, M.S. (2018) Russian and English terminological glossary on morphology of diatoms. <em>Novosti sistematiki nizshikh rastenii</em> 52 (2): 265–309. https://doi.org/10.31111/nsnr/2018.52.2.265</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Greville, R.K. (1822) A description of two new plants of the order Algae, found in Scotalnd. <em>Memoirs of the Wernerian Natural History Society</em> 4: 213–217.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hein, M.K. (1990) Flora of Adak Island, Alaska: Bacillariophyceae (Diatoms). <em>Bibliotheca Diatomologica</em> 21: 1–133.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Heudre, D., Wetzel, C.E., Lange-Bertalot, H., Van de Vijver, B., Moreau, L. & Ector, L. (2021) A review of <em>Tabellaria</em> species from freshwater environments in Europe. <em>Fottea, Olomouc</em> 21 (2): 180–205. https://doi.org/10.5507/fot.2021.005</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hustedt, F. (1930) Bacillariophyta (Diatomeae) Zweite Auflage. <em>In</em>: Pascher, A. (Ed.) <em>Die Süsswasser-Flora Mitteleuropas. Heft 10.</em> Verlag von Gustav Fischer, Jena, vii pp., 466 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Hustedt, F. (1959) Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. 2.Teil. <em>In</em>: <em>Dr. L. Rabenhorst’s Kryptogamen-Flora von Deutschland, Österreich und der Schweiz</em>. Akademische Verlagsgesellschaft Geest & Portig KG, Leipzig, 845 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kelly, M.G., Adams, C., Graves, A.C., Jamieson, J., Krokowski, J., Lycett, E.B., Murray-Bligh, J., Prichard, S. & Wilkins, C. (2001) <em>The trophic diatom index: a user’s manual. Revised edition</em>. Environment Agency, Bristol, 135 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Krammer, K. & Lange-Bertalot, H. (1991) Bacillariophyceae. 3 Teil: Centrales, Fragilariaceae, Eunotiaceae. <em>In</em>: Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.) <em>Süsswasserflora von Mitteleuropa Band 2/3</em>. Gustav Fischer Verlag, Stuttgart, Jena, xiii pp., 576 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kützing, F.T. (1844) <em>Die Kieselschaligen Bacillarien oder Diatomeen</em>. Zu finden bei W. Köhne, Nordhausen, vii pp., 152 pp., 30 pls. https://doi.org/10.5962/bhl.title.64360</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Kützing, F.T. (1849) <em>Species algarum</em>. F.A. Brockhaus, Lipsiae, vi pp., 922 pp.</span></span></span></p>
<p align="justify"><span style="color: #000000;"><span style="font-family: Times New Roman, serif;"><span style="font-size: small;">Lange-Bertalot, H. (1988) Die Gattung <em>Tabellaria</em> unter besonderer Berücksichtigung von <em>Tabellaria ventricosa</em> Kützing (Bacillariophyceae). <em>Nova Hedwigia</em> 46 (3–4): 413–431.</span></span></span></p>
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