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. 2023 Nov 17;12(22):3890.
doi: 10.3390/plants12223890.

Is Sellaphora the New Navicula? Cymbosellaphora (Cymbellales), a New Genus Based on Taxa Previously Assigned to Sellaphora

Maxim S Kulikovskiy  1 , Anton M Glushchenko  1 , Sergei I Genkal  2 , Irina V Kuznetsova  1 , Yevhen I Maltsev  1 , John Patrick Kociolek  3
Affiliations

Is Sellaphora the New Navicula? Cymbosellaphora (Cymbellales), a New Genus Based on Taxa Previously Assigned to Sellaphora

Maxim S Kulikovskiy et al. Plants (Basel). .

Abstract

A new diatom genus Cymbosellaphora Kulikovskiy, Glushchenko, Genkal and Kociolek gen. nov., was described with species Cymbosellaphora vietnamensis Glushchenko, Kulikovskiy and Kociolek sp. nov. C. vietnamensis sp. nov. was described from Vietnam and characterized by the presence of morphological features such as valves with naviculoid symmetry, slight dorsiventrality, the presence of tectula as pore occlusions, uniseriate striae, and a very broad mantle. Four species were transferred to the new genus. These are C. absoluta comb. nov., C. circumborealis comb. nov., C. geisslerae comb. nov., and C. laterostrata comb. nov. Previously, these species were members of genera Navicula Bory, Sellaphora Mereschkowsky, and Naviculadicta Lange-Bertalot. The taxonomic history of these species and genera are discussed. The tectulum is known only from the cymbelloid diatoms, and our new genus is placed within the Cymbellaceae. The presence of a tectulum demonstrates that these species cannot be placed in Sellaphora, as indicated in the literature. The recent proposal to transfer a large number of species with different morphologies to the genus Sellaphora is also discussed. Additionally, we compare pore occlusions with tectula between different genera of the Cymbellaceae with naviculoid symmetry.

Keywords: Cymbella; Cymbosellaphora; Navicula; Sellaphora; diatoms; morphology; new genus.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
(A–L) Cymbosellaphora vietnamensis Glushchenko, Kulikovskiy and Kociolek sp. nov. Light microscopy, differential interference contrast, size diminution series. Vietnam. Slide no. 02151. (A) Holotype. Scale bar = 10 μm.
Figure 2
Figure 2
(A–H) Cymbosellaphora vietnamensis Glushchenko, Kulikovskiy and Kociolek sp. nov. Scanning electron microscopy, external views. (A,B) The whole valve. (C–E) Central area. (F) Central raphe end. (G,H) Valve ends. Scale bar (A,B) = 2 μm; (C–E) = 1 μm; (G,H) = 0.5 μm (F) = 0.2 μm.
Figure 3
Figure 3
(A–F) Cymbosellaphora vietnamensis Glushchenko, Kulikovskiy and Kociolek sp. nov. Scanning electron microscopy, internal views. (A,B) The whole valve. (C,D) Central area. (E,F) Valve ends. Tectula, as small struts, are present between areolar openings within each stria. Voigt discontinuity is clearly visible. Scale bar (A,B) = 2 μm; (C–F) = 0.5 μm.
Figure 4
Figure 4
(A–P) Cymbosellaphora absoluta Kulikovskiy, Glushchenko, Genkal and Kociolek comb. nov. Light microscopy, differential interference contrast, size diminution series. Mongolia. Slide no. 02431 (L,P); 02440 (A,J); 02441 (C,M); 02442 (E); 02445 (H); 02446 (K); 02447 (B,F,N,O); 02451 (I); 02457 (D,G). Scale bar = 10 μm.
Figure 5
Figure 5
(A–F) Cymbosellaphora absoluta Kulikovskiy, Glushchenko, Genkal and Kociolek comb. nov. Scanning electron microscopy, external views. (A–E) The whole valve. (F) Fragment of valve. Scale bar (B,D) = 5 μm; (A,C,E,F) = 2 μm.
Figure 6
Figure 6
(A–F) Cymbosellaphora absoluta Kulikovskiy, Glushchenko, Genkal and Kociolek comb. nov. Scanning electron microscopy, external views. (A–C) Central area. (D–F) Valve ends. Scale bar (A–F) = 0.5 μm.
Figure 7
Figure 7
(A–D) Cymbosellaphora absoluta Kulikovskiy, Glushchenko, Genkal and Kociolek comb. nov. Scanning electron microscopy, internal views. (A–C) The whole valve. Voigt discontinuity is clearly visible. (D) Fragment of valve. Scale bar (C) = 5 μm; (A,B,D) = 2 μm.
Figure 8
Figure 8
(A–D) Cymbosellaphora absoluta Kulikovskiy, Glushchenko, Genkal and Kociolek comb. nov. Scanning electron microscopy, internal views. (A–C) Central area. (D) Valve end. Tectula, as struts, are present between areolar openings within each stria. Scale bar (C) = 1 μm; (A,B,D) = 0.5 μm.
Figure 9
Figure 9
(A–L) Cymbosellaphora circumborealis Kulikovskiy, Glushchenko, Genkal and Kociolek comb. nov. (A–D) Light microscopy, differential interference contrast, size diminution series. Mongolia. Slide no. 02663 (B); 02684 (A); 02695 (C); 03009 (D). (E–H) SEM, external view. (I–L) SEM, internal view. (E,F,I,J) The whole valve. (G,K) Central area. (H,L) Valve ends. Scale bar = (A–D) = 10 μm; (E,F) = 2 μm; (I,J) = 1 μm; (G,H,K,L) = 0.5 μm.
Figure 10
Figure 10
(A–K) Cymbosellaphora geisslerae (Jahn) Kulikovskiy, Glushchenko, Genkal, and Kociolek comb. nov. Light microscopy, differential interference contrast, size diminution series. Mongolia. Slide no. 02642 (A–C,E–G,I–K); 02684 (D,H). Scale bar = 10 μm.
Figure 11
Figure 11
(A–F) Cymbosellaphora geisslerae Kulikovskiy, Glushchenko, Genkal and Kociolek comb. nov. Scanning electron microscopy. (A,B) External views. (C–F) Internal views. (A–E) The whole valve. (B) Valve end. (F) Central area. Tectula, as small struts, are present between areolar openings within each stria. Scale bar (A,C,D) = 2 μm; (B,E) = 1 μm; (F) = 0.5 μm.
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