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Issue: Vol. 705 No. 1: 11 Jun. 2025
Type: Article
Published: 2025-06-11
DOI: 10.11646/phytotaxa.705.1.7
Page range: 86-96
Abstract views: 45
PDF downloaded: 5

Two new species of the genus Mallomonas (Chrysophyceae) from ephemeral pools in the steppe zone of the Southern Urals, Russia

Institute for Cellular and Intracellular Symbiosis of the Ural Branch of the Russian Academy of Sciences of the Orenburg Federal Research Center RAS, Pionerskaya Street, 11, 460000, Orenburg, Russia
Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Leninsky Prospect, 33, 119071, Moscow, Russia
Institute for Cellular and Intracellular Symbiosis of the Ural Branch of the Russian Academy of Sciences of the Orenburg Federal Research Center RAS, Pionerskaya Street, 11, 460000, Orenburg, Russia
Mallomonas new species section Torquatae Southern Urals silica-scaled chrysophytes Algae

Abstract

Two new species, Mallomonas kalmykovae and M. prominentia, are described from small ephemeral pools, located in the steppe zone of the Southern Urals (Russia), based on silica-scale morphology observed using scanning and transmission electron microscopy. Both species belong to section Torquatae, series Mangoferae, and are similar to M. favosa. For M. kalmykovae, characteristic features include oval-rhombic scales, the presence of three longitudinal ribs on the wide arms of the posterior submarginal rib, and 2–3 rows of meshes on the shield arranged in parallel rows along the posterior submarginal rib. Scales of M. prominentia are characterized by the presence of a raised shield, a groove between the shield and the posterior submarginal rib and a wide anterior flange. The shield on the body scales of M. prominentia is raised to a greater extent in the proximal part, forming a protrusion over the posterior submarginal rib.

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How to Cite

Ignatenko, M., Gusev, E. & Yatsenko-Stepanova, T. (2025) Two new species of the genus Mallomonas (Chrysophyceae) from ephemeral pools in the steppe zone of the Southern Urals, Russia. Phytotaxa 705 (1): 86–96. https://doi.org/10.11646/phytotaxa.705.1.7