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Issue: Vol. 659 No. 1: 9 Jul. 2024
Type: Article
Published: 2024-07-09
DOI: 10.11646/phytotaxa.659.1.2
Page range: 24-40
Abstract views: 130
PDF downloaded: 1

Tolypella mongolica (Charophyceae, Characeae): A new dioecious charophyte species from the center of Eurasia and implications for charophyte taxonomy, including the validation of T. porteri and the new combination for T. jwalae

Komarov Botanical Institute of the Russian Academy of Sciences, Professora Popova Str., 2, 197376 St. Petersburg, Russia
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 100-letiya Vladivostoka Ave., 159, 690022 Vladivostok, Russia
Papanin Institute for Biology of Inland Waters of the Russian Academy of Sciences, 109, Borok, Nekouz District, Yaroslavl Region, 152742, Russia. Cherepovets State University, Lunacharsky Prosp. 5, Cherepovets, Vologda Region, 162600, Russia.
Laboratory of Plant Systematics and Phylogeny, Botanic Garden and Research Institute, Mongolian Academy of Sciences, Enkhtaivan Ave. 54a, Ulaanbaatar 13330, Mongolia
Research Center for Fundamental and Applied Problems of Bioeсology and Biotechnology, Ulyanovsk State Pedagogical University, Lenin Sq., 4/5, Ulyanovsk, 432071, Russia
Zoological Institute, Russian Academy of Sciences, University Embankment, 1, St. Petersburg, 199034, Russia
Federal Scientific Center of the East Asia Terrestrial Biodiversity, Far Eastern Branch of the Russian Academy of Sciences, 100-letiya Vladivostoka Ave., 159, 690022 Vladivostok, Russia
Mongolia Altai Mountains Caspian Lowland new combination typification phylogeny oospores Nitella jwalae Tolypella glomerata Tolypella hispanica Tolypella porteri Algae

Abstract

A new dioecious species of Tolypella, T. mongolica sp. nov. from the section Tolypella, was described using an integrative taxonomy. It was found in three distant localities – shallows of a brackish small lake and a channel in the midland steppe in Mongolia and the Altai Mountains, and a small brackish water body in the dry steppe in Southeast Europe. It differs from other species in rbcL and ITS sequences and in distinct complex ornamentation of the oospore surface, varying from sparsely coarsely tuberculate to having the appearance of an aerial view of mountain landscape with acute to mostly sharp edges of elements at probably the ripest stage. Wide intrapopulation variability of expression of this trait, only partly explainable by oospore ripening stage, was found and illustrated for two populations, indicating previous underestimation of this phenomenon in taxonomic research. T. mongolica is richly fertile and appears to be ephemeral as most species of this genus. Only female plants were found in all localities. The absence of male plants could be referred to either their earlier development during the growing season or, less likely, parthenogenesis in this species. The description of the new species suggests taxonomic changes for two dioecious species of charophytes. Tolypella porteri stat. et comb. nov. was validated here. T. jwalae was recognized as a species of Nitella, N. jwalae comb. nov.

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