Abstract
We describe Frustulia hengduanensis sp. nov., a new species of Frustulia from the Hengduan Mountains in China, based on morphological examinations using light and scanning electron microscopy. Frustulia hengduanensis is characterized by elliptico-lanceolate to rhomboid valves with slightly undulate margins, narrowly rounded and moderately protracted apices, slightly curved longitudinal ribs and raphe, wavy striae along the length of the valve, and an absence of striae within the central part of the valve, forming a dumbbell-shaped hyaline area, this is the main feature that distinguishes the new species from others in the genus. We compared F. hengduanensis sp. nov. with similar taxa and discussed its biogeographical distribution.
References
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<p>Yu, P., You, Q.M., Kociolek, J.P. & Wang, Q.X. (2019) Three new freshwater species of the genus <em>Achnanthidium</em> (bacillariophyta, achnanthidiaceae) from Taiping Lake, China. <em>Journal of the Czech Phycological Society</em> 19: 33–49. https://doi.org/10.5507/fot.2018.015</p>
<p>Zhang, D.C., Zhang, Y.H., Boufford, D.E. & Hang, S. (2009) Elevational patterns of species richness and endemism for some important taxa in the Hengduan Mountains, southwestern China. <em>Biodiversity & Conservation</em> 18: 699–716. https://doi.org/10.1007/s10531-008-9534-x</p>
<p>Zhu, H.Z. & Chen, J.Y. (2000) <em>Diatoms in Tibet, China</em>. Science Press, Beijing, 353 pp.</p>
<p>Casa, V., Mataloni, G. & Van de Vijver, B. (2018) Six new<em> Frustulia</em> species (bacillariophyta) in tierra del fuego peatbogs, Patagonia, Argentina.<em> Journal of the Czech Phycological Society</em> 18: 55–71. https://doi.org/10.5507/fot.2017.016</p>
<p>Cleve, P.T. (1894) Synopsis of the Naviculoid diatoms. Part I. <em>Kongliga Svenska Vetenskaps akademiens Handlingar Series</em> 426: 1–194.</p>
<p>De Toni, G.B. (1891) <em>Sylloge algarum omnium hucusque cognitarum. Vol. II. Sylloge Bacillariearum</em>.<em> Sectio I. Rhaphideae</em>. Sumptibus auctoris, Patavii, pp. 277–280.</p>
<p>Flower, R.J. (2005) A taxonomic and ecological study of diatoms from freshwater habitats in the Falkland Islands, South Atlantic. <em>Diatom Research </em>20 (1): 23–96. https://doi.org/10.1080/0269249X.2005.9705620</p>
<p>Guiry, M.D. & Guiry, G.M. (2022) <em>AlgaeBase</em>. World-wide electronic publication, National University of Ireland, Galway. Available from: http://www.algaebase.org (accessed 22 August 2022)</p>
<p>Hustedt, F. (1930) <em>Bacillariophyta (Diatomeae) Zweite in Die Süsswasser-Flora Mitteleuropas.</em> Heft 10, Otto Koeltz Science Publisher, Koenigstein, 466 pp.</p>
<p>Kociolek, J.P. (2019) A worldwide listing and biogeography of freshwater diatom genera: a phylogenetic perspective. <em>Diatom Research</em> 33: 1–26. https://doi.org/10.1080/0269249X.2019.1574243</p>
<p>Krasske, G. (1923) Die Diatomeen des Casseler Beckens und seiner Randgebirge nebst einigen wichtigen Funden aus Niederhessen. <em>Botanisches Archiv </em>3: 185–209.</p>
<p>Lange–Bertalot, H. (2001) <em>Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. </em>Diatoms of Europe Diatoma of Europian Inland Waters & Comparable Habitats. Vol. 2. Ruggell, 526 pp.</p>
<p>Lange-Bertalot, H. & Metzeltin, D. (1996) <em>Indicators of oligotrophy. 800 taxa representative of three ecologically distinct lake types, carbonate buffered-Oligodystrophic-weakly buffered soft water with 2428 figures on 125 plates. Oligotrophie-Indikatoren. 800 Taxa repräsentativ für drei diverse Seen–Typen: Kalkreich – Oligodystroph - Schwach gepuffertes Weichwasser mit 2428 Figuren auf 125 Tafeln.</em> Iconographia Diatomologica 2. 57 pp.</p>
<p>Luo, F., You, Q.M., Zhang, L.X., Yu, P., Pang, W.T., Bixby, R.J. & Wang, Q.X. (2021) Three new species of the diatom genus <em>Hannaea</em> Patrick (bacillariophyta) from the Hengduan Mountains, China, with notes on <em>Hannaea</em> diversity in the region. <em>Diatom Research </em>36: 25–38. https://doi.org/10.1080/0269249X.2021.1873193</p>
<p>Manguin, E. (1957) Premier inventaire des diatomées de la Terre Adélie antarctique. Espèces nouvelles. <em>Revue Algologique</em> 3: 111–134.</p>
<p>Rabenhorst, L. (1853) <em>Die Süsswasser-Diatomaceen (Bacillarien.): für Freunde der Mikroskopie</em>. Leipzig, 72 pp. https://doi.org/10.5962/bhl.title.8348</p>
<p>Round, F.E., Crawford, R.M. & Mann, D.G. (1990) <em>The diatoms. Biology and morphology of the genera</em>. Cambridge University Press, Bath, 747 pp.</p>
<p>Rumrich, U., Lange-Bertalot, H. & Rumrich, M. (2000) <em>Diatomeen der Anden von Venezuela bis Patagonien/Feuerland und zwei weitere Beiträge. Diatoms of the Andes. From Venezuela to Patagonia/Tierra del Fuego. And two additional contributions.</em> Iconographia Diatomologica 9. 673 pp.</p>
<p>Shi, Z.X. (1994) <em>A survey of algae resources in Southwest China</em>. Science Press, Beijing, pp. 228–361.</p>
<p>Siver, P.A. & Baskette, G. (2004) A morphological examination of <em>Frustulia </em>(Bacillariophyceae) from the Ocala National Forest, Florida, USA. <em>Canadian Journal of Botany</em> 82: 629–644. https://doi.org/10.1139/b04-035</p>
<p>Skuja, H. (1937) <em>Symbolae Sinicae: Botanische ergebnisse der Expedition der Akademie der Wissenschaften in Wien nach Sudwest-China, 1914/1918: Algae. 1.</em> Verlag von Julius Springer, Wien, 105 pp.</p>
<p>Urbánková, P., Kulichová, J. & Kilroy, C. (2014) <em>Frustulia curvata </em>and <em>Frustulia paulii</em>, two diatom species new to science. <em>Diatom Research </em>30: 65–73. https://doi.org/10.1080/0269249X.2014.968625</p>
<p>Van de Vijver, B. (2002) <em>Frustulia cirisiae sp. nov.</em>, a new aerophilous diatom from Ile de la Possession (Crozet Archipelago, Subantarctica). <em>Diatom Research </em>17: 415–421. https://doi.org/10.1080/0269249X.2002.9705558</p>
<p>Yu, P., You, Q.M., Kociolek, J.P. & Wang, Q.X. (2019) Three new freshwater species of the genus <em>Achnanthidium</em> (bacillariophyta, achnanthidiaceae) from Taiping Lake, China. <em>Journal of the Czech Phycological Society</em> 19: 33–49. https://doi.org/10.5507/fot.2018.015</p>
<p>Zhang, D.C., Zhang, Y.H., Boufford, D.E. & Hang, S. (2009) Elevational patterns of species richness and endemism for some important taxa in the Hengduan Mountains, southwestern China. <em>Biodiversity & Conservation</em> 18: 699–716. https://doi.org/10.1007/s10531-008-9534-x</p>
<p>Zhu, H.Z. & Chen, J.Y. (2000) <em>Diatoms in Tibet, China</em>. Science Press, Beijing, 353 pp.</p>