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Issue: Vol. 664 No. 2: 5 Sept. 2024
Type: Article
Published: 2024-09-05
DOI: 10.11646/phytotaxa.664.2.3
Page range: 111-122
Abstract views: 167
PDF downloaded: 8

Two new Planothidium (Achnanthidiaceae, Bacillariophyceae) species with a sinus from the Kamchatka Peninsula, Russia

Timiryazev Institute of Plant Physiology RAS, 35 Botanicheskaya St., 127276 Moscow, Russia. Department of Mycology and Algology, Faculty of Biology, Lomonosov Moscow State University, 119234 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
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
Planothidium new species monoraphid diatoms Kamchatka Peninsula molecular investigation Algae

Abstract

Two new species from the genus Planothidium are described from the Kamchatka Peninsula, Russia, based on morphological and molecular analysis: Planothidium piipii and P. novograblenovii. The new species are characterised by a horseshoe-shaped structure in the form of a sinus on the rapheless valve. Comparison with closely related species is provided; the new species are distinguished by various traits, including valve outline and dimensions, striation patterns, and sinus shape. According to molecular data, strains of the new species form a subclade within a clade that includes species of the Planothidium lanceolatum complex.

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