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Title
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A critical analysis of the type material and taxonomic revision of the Indian Stauroneis acuta complex (Bacillariophyta) with the separation of two new species
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Author
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Abstract
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| The identification of Stauroneis acuta W.Smith was problematic for diatom taxonomists worldwide and led to the assumption that it is a cosmopolitan species. In the nineteenth century, several infraspecific taxa of S. acuta were described as varieties and forms across continents. In India, H.P. Gandhi reported S. acuta and described S. acuta var. tenuis Gonzalves & H.P.Gandhi. The present study attempts to revise Gandhi's S. acuta complex using his collections. In addition, the Van Heurck diatom collection (BR, Meise Botanic Garden, Belgium) has multiple syntype materials of S. acuta and was examined to elucidate the original concept and taxonomy of S. acuta, as an aid for resolving the Indian taxa. The morphology and ultrastructural details were analysed employing light and scanning electron microscopy observations. Our analysis of the Indian S. acuta complex reveals one new species: Stauroneis chemburensis Wadmare & B.Karthick sp. nov. Stauroneis acuta var. tenuis is validated as Stauroneis acutopsis Wadmare & B.Karthick nom. nov. stat. nov. Both taxa S. chemburensis and S. acutopsis can be differentiated from S. acuta based on valve outline, valve dimensions, the structure of the proximal raphe endings, and striae density. The current observations addresses the lectotypification of S. acuta W.Smith, clarifies the typification of Gandhi's specimens and provides new information about the morphology of the species. |
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Language
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English
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Source (journal)
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Nova Hedwigia: Zeitschrift für Kryptogamenkunde. - Berlin
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Publication
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Berlin
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2023
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ISSN
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0029-5035
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DOI
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10.1127/NOVA_HEDWIGIA/2023/0844
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Volume/pages
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117
:1-4
(2023)
, p. 351-380
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ISI
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001101051400001
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Full text (Publisher's DOI)
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