Fottea 2020, 20(1):75-85 | DOI: 10.5507/fot.2019.017

Analysis and critical evaluation of structural features in four Cymbellaceae taxa from New Caledonia

René Le Cohu1, Horst Lange-Bertalot2, Bart Van de Viver3,4, Loïc Tudesque5
1 ECOLAB, Université de Toulouse, CNRS, INP, UPS, Toulouse, France
2 University of Frankfurt & Senckenberg Museum, Seckenberganlage 31-33, 60054 Frankfurt am Main, Germany
3 Jardin botanique de Meise, Département de Recherche, Nieuwelaan 38, B-1860 Meise, Belgique
4 Université d'Anvers, Département de Biologie-ECOBE, Universiteitsplein, B-2610 Wilrijk, Belgique
5 Laboratoire Évolution & Diversité Biologique (EDB UMR 5174), Université de Toulouse Midi-Pyrénées, CNRS, IRD, UPS. 118 route de Narbonne, Bat 4R1, 31062 Toulouse cedex 9, France

Delicatophycus costei (Lange-Bertalot et Moser) Wynne, Cymbella bourrellyi Maillard, Cymbella latarea Maillard and Cymbella pernodensis Maillard are endemic to New Caledonia and show uncommon morphological features compared to the "sensu stricto" definition of their respective genus. Delicatophycus costei was described based on light microscopy and scanning electron microscopy (SEM) observations, confirming the generic LM diagnosis. However, the external view in SEM is atypical as both valve face and mantle are covered by longitudinal ribs, overlaying part of the zig-zag striae, generally accepted as the determinant generic feature. The three species of Cymbella have both apical pore fields and "stigmata". However, they show some specific morphological features compared to the more classically shaped Cymbella species. Cymbella bourrellyi has a narrow hyaline area on the valve face and the areolae are bordered internally by small outgrowths. Cymbella pernodensis is distinguished by internal biseriate striae. The internal morphology of Cymbella latarea is characteristic in having typical biseriate striae and bisected apical pore fields. In these three species, internally, the stigmata are continuous with the striae and appear as simple and only weakly separated structures at the end of the striae. The three species are also characterized by differences in the number of areola rows per stria externally and internally.

Keywords: Cymbella, Delicatophycus, New Caledonia, taxonomy, ultrastructure

Received: October 11, 2019; Accepted: November 12, 2019; Prepublished online: February 19, 2020; Published: April 1, 2020Show citation

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Le Cohu, R., Lange-Bertalot, H., Van de Viver, B., & Tudesque, L. (2020). Analysis and critical evaluation of structural features in four Cymbellaceae taxa from New Caledonia. Fottea, 20(1), 75-85. doi: 10.5507/fot.2019.017
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