Planoplatessa M.S.Kulikovskiy, A.M.Glushchenko & J.P.Kociolek, 2022

Holotype species: Planoplatessa joursacensis (Héribaud) Kulikovskiy, Glushchenko & Kociolek

Original publication and holotype designation: Kulikovskiy, M.S., Glushchenko, A.M., Kuznetsova, I.V. & Kociolek, J.P. (2022). Planoplatessa gen. nov. A new, neglected monoraphid diatom genus with a cavum. Plants [MDPI] 11(2314): 1-9, 3 figs, 1 table.

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Description: Light microscopy (LM), raphe valves. Valves broadly elliptic with broadly rounded ends. Length 9.3–19.3 ?m, width 5.5–8.4 ?m. Raphe straight and filiform. Central area small and roundish. Axial area moderately narrow, almost linear. Striae 17– 19 in 10 ?m. Striae radiate at the center of the valve; very strongly radiate and curved toward the ends. LM, rapheless valves (Figure 1J–R). Axial area narrowly lanceolate. Striae spaced slightly wider than in raphe valves. Visible horseshoe-shaped structure is present. Scanning electron microscopy (SEM), raphe valves . Striae uniseriate. Raphe filiform and straight. Distal raphe ends straight and present on valve face outside. Central raphe ends straight and tear-shaped outside. Mantle is short, with two small areolae present in prolongation of every striae . Interstriae are wider than striae inside and outside . Inside, distal raphe ends in smaller helictoglossae and curved in opposite direction. Central raphe ends are slim and curved to different sides . Distal and central raphe ends are curved opposite to another. Areolae ? 60 in 10 ?m. SEM, rapheless valves. Striae uniseriate. Interstriae are wider than striae. Areolae covered by silica membrane internally. Externally, central area large and flat on one side of valve ; in another part, all striae are normally present or one central stria is slightly shorter. Internally, a large cavum is present (Figure 3E, black arrow). Striae are situated in deep alveoli.

Information contributed by: Original description.. The most recent alteration to this page was made on 2023-12-24 by Salvador Valenzuela Miranda.

Taxonomic status: This name is of an entity that is currently accepted taxonomically.

Gender: This genus name is currently treated as feminine.

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Contributors
Some of the descriptions included in AlgaeBase were originally from the unpublished Encyclopedia of Algal Genera, organised in the 1990s by Dr Bruce Parker on behalf of the Phycological Society of America (PSA) and intended to be published in CD format. These AlgaeBase descriptions are now being continually updated, and each current contributor is identified above. The PSA and AlgaeBase warmly acknowledge the generosity of all past and present contributors and particularly the work of Dr Parker.

Descriptions of chrysophyte genera were subsequently published in J. Kristiansen & H.R. Preisig (eds.). 2001. Encyclopedia of Chrysophyte Genera. Bibliotheca Phycologica 110: 1-260.

Linking to this page: https://www.algaebase.org/search/genus/detail/?genus_id=54912

Citing AlgaeBase
Cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 24 December 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 10 May 2024