Fottea 2020, 20(1):58-67 | DOI: 10.5507/fot.2019.014

Platebaikalia - a new monoraphid diatom genus from ancient Lake Baikal with comments on the genus Platessa

Maxim S. Kulikovskiy1 *, Anton M. Glushchenko1, Sergei I. Genkal2, Irina V. Kuznetsova1, John P. Kociolek3,4
1 К.А. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia; *Corresponding author e-mail: max-kulikovsky@yandex.ru
2 Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Yaroslavl, Nekouz, Borok, Russia
3 Museum of Natural History and
4 Department of Ecology and Evolutionary Biology University of Colorado, Boulder, Colorado, 80309 USA

A new monoraphid diatom genus, Platebaikalia gen. nov., was described based on a detailed morphological investigation using light and scanning electron microscopy. Previously Platessa elegans Kulikovskiy et Lange-Bertalot was described from ancient Lake Baikal, and this species serves as the generitype for the newly-described genus. Platebaikalia elegans is a rare taxon found in the deeper parts of Lake Baikal. Platebaikalia elegans is characterized by having multiseriate striae on the raphe valves with biseriate striae on the rapheless valves, though in some specimens a short third row of areolae may be present in some striae. Morphology of striae is helpful to distinguish the genus Platebaikalia from Platessa and other monoraphid genera. Other morphological features that differentiate our new genus from other monoraphid taxa are discussed. We review the morphological data on Platessa species, and based on these data can recognize eight groups of taxa in the genus. Our analysis shows that Platessa as currently circumscribed may contain groups of species that are quite different from one another morphologically, and possibly includes taxa that could be recognized as different at the genus level. A few new combinations are suggested when taxa from the genus Platessa transferred to genera Psammothidium and Planothidium. Some problems of taxonomy of monoraphid taxa are discussed and we believe that taxonomy of this group of diatoms is in need of special attention in future.

Keywords: diatoms, Platebaikalia, Platessa, new genus, morphology, monoraphid, taxonomy, ancient lakes, Baikal

Received: September 15, 2019; Accepted: October 29, 2019; Prepublished online: February 18, 2020; Published: April 1, 2020  Show citation

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Kulikovskiy, M.S., Glushchenko, A.M., Genkal, S.I., Kuznetsova, I.V., & Kociolek, J.P. (2020). Platebaikalia - a new monoraphid diatom genus from ancient Lake Baikal with comments on the genus Platessa. Fottea, 20(1), 58-67. doi: 10.5507/fot.2019.014
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