What does this research mean for the field?

The diatom species Surirella barrowcliffia is reported for the first time in the flora of Russia, and both S. barrowcliffia and S. didyma exhibit greater morphological variability than previously documented. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.ESTABLISHES_NEW_DIRECTION.

What question did this study set out to answer?

To investigate the morphology of two species of Surirella and assess their variability based on quantitative characters.

March 1, 2026

Morphological Variability of Two Species of the Genus Surirella (Bacillariophyta) From Udmurtia

Key Points

To investigate the morphology of two species of Surirella and assess their variability based on quantitative characters.
Utilized scanning electron microscopy for morphological analysis.
Analyzed quantitative characters, including valve length and width and number of costae per 10 μm.
Compared findings with literature data for diagnosis refinement.
Identified greater morphological variability compared to existing literature.
Refined diagnoses of both Surirella species based on new observations.
Documented the first occurrence of S. barrowcliffia in the Kilmez River for Russian flora.

Abstract

This scanning electron microscopy study investigates the morphology of two species of the diatom genus Surirella (S. barrowcliffia, S. didyma) from phytobenthos of the Kilmez River (Udmurtia). Some analyzed quantitative characters (valve length and width, number of costae in 10 μm) manifested greater variability in comparison with the literature data, which allowed us to refine their diagnoses. Analysis of the literature showed that the discovery of S. barrowcliffia in the Kilmez River is the first for the flora of Russia.

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Morphological Variability of Two Species of the Genus Surirella (Bacillariophyta) From Udmurtia

Key Points

Abstract

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