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Issue: Vol. 712 No. 1: 29 Jul. 2025
Type: Article
Published: 2025-07-29
DOI: 10.11646/phytotaxa.712.1.1
Page range: 1-17
Abstract views: 235
PDF downloaded: 10

A reinvestigation of Stephanodiscus triporus (Stephanodiscaceae, Mediophyceae) with the description of Stephanoarcus gen. nov.

Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, 152742 Borok, Russia
Timiryazev Institute of Plant Physiology RAS, 35 Botanicheskaya St., 127276 Moscow, Russia
Timiryazev Institute of Plant Physiology RAS, 35 Botanicheskaya St., 127276 Moscow, Russia
Timiryazev Institute of Plant Physiology RAS, 35 Botanicheskaya St., 127276 Moscow, Russia
centric diatoms morphology new genus Stephanoarcus Stephanodiscus triporus Algae

Abstract

A new genus Stephanoarcus gen. nov. is described based on the presence of arch-like structures around the marginal fultoportulae, the fascicles continuing from the valve face to mantle without changes in areolae structure, and the position of marginal fultoportulae at the very edge of the valve mantle. Five species are transferred to the new genus: S. triporus, S. vestibulis, S. lacustris, S. hashiensis and S. moraviensis. The descriptions of S. triporus, S. vestibulis and S. lacustris are amended based on the study of material from multiple locations throughout Russia, as well as literature data. The variability and taxonomic significance of some morphological features, both quantitative and qualitative, are discussed.

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How to Cite

Genkal, S., Glushchenko, A., Tseplik, N. & Kulikovskiy, M. (2025) A reinvestigation of Stephanodiscus triporus (Stephanodiscaceae, Mediophyceae) with the description of Stephanoarcus gen. nov.. Phytotaxa 712 (1): 1–17. https://doi.org/10.11646/phytotaxa.712.1.1