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. 2022 Sep 3;11(17):2314.
doi: 10.3390/plants11172314.

Planoplatessa gen. nov.-A New, Neglected Monoraphid Diatom Genus with a Cavum

Maxim S Kulikovskiy  1 , Anton M Glushchenko  1 , Irina V Kuznetsova  1 , John Patrick Kociolek  2
Affiliations

Planoplatessa gen. nov.-A New, Neglected Monoraphid Diatom Genus with a Cavum

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

Abstract

A new monoraphid diatom genus, Planoplatessa gen. nov., is described on the basis of a detailed morphological investigation using light and scanning electron microscopy. We transferred Achnanthes joursacensis Héribaud, a species described from fossil deposits in France, to our new genus. We investigated material from Mongolia from Recent populations. This taxon is known from fossils to Recent across the Holarctic. Achnanthes joursacensis was previously transferred to the genera Planothidium and Platessa, but the morphology of A. joursacensis does not share all morphological features with these two genera. We discuss important morphological features for the delimitation of monoraphid genera based on careful morphological and molecular investigations we presented previously. Planoplatessa gen. nov. as a genus is characterized by having uniseriate striae on both the raphe and the rapheless valves, a cavum in rapheless valves only, and straight distal raphe ends on the valve face.

Keywords: Lake Khövsgöl; Mongolia; Planoplatessa; Platessa; 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 result.

Figures

Figure 1
Figure 1
Planoplatessa joursacensis (Héribaud) Kulikovskiy, Glushchenko & Kociolek comb. nov. Slide no. 02605. Light microscopy, differential interference contrast, size diminution series. (A–I). Raphe valves. (J–R). Rapheless valves. Scale bar = 10 μm.
Figure 2
Figure 2
Planoplatessa joursacensis (Héribaud) Kulikovskiy, Glushchenko & Kociolek comb. nov. Scanning electron microscopy. Raphe valves. (A). The entire valve, external view. Black arrows show the filiform and straight raphe. White arrow shows the uniseriate stria. Black arrowhead shows the valve mantle. White arrowhead shows the interstria. (B). Central area, external view. Black arrows show the central raphe ends. (C). Valve end, external view. White arrow shows the distal raphe end. (D). The whole valve, internal views. Black arrows show the filiform and straight raphe. White arrow shows the uniseriate stria. White arrowhead shows the interstria. (E). Central area, internal view. Black arrows show the deflected in opposite directions central raphe ends. (F). Valve end, internal view. Black arrow shows the helictoglossa. Scale bar (A,D) = 2 μm; (B,E) = 1 μm; (C,F) = 0.5 μm.
Figure 3
Figure 3
Planoplatessa joursacensis (Héribaud) Kulikovskiy, Glushchenko & Kociolek comb. nov. Scanning electron microscopy. Rapheless valves. (A). The entire valve, external view. Black arrow shows the shortened central stria. White arrow shows the central area. White arrowhead shows the interstria. (B). Central area, external view. Black arrow shows the shortened central stria. White arrow shows the central area. (C). Valve end, external view. Black arrow shows the uniseriate stria. Black (D). The whole valve, internal view. Black arrow shows the uniseriate stria, situated in deep alveola. White arrowhead shows the interstria. (E). Internal view. Black arrow shows the cavum. (F). Valve end, internal views. Black arrow shows the uniseriate stria, situated in deep alveola. Scale bar (A,D) = 2 μm; (B,E) = 1 μm; (C,F) = 0.5 μm.
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References

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