<i>Planoplatessa</i> gen. nov.—A New, Neglected Monoraphid Diatom Genus with a Cavum
2022
Maxim S. Kulikovskiy | Anton M. Glushchenko | Irina V. Kuznetsova | John Patrick Kociolek
A new monoraphid diatom genus, <i>Planoplatessa</i> gen. nov., is described on the basis of a detailed morphological investigation using light and scanning electron microscopy. We transferred <i>Achnanthes joursacensis</i> 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. <i>Achnanthes joursacensis</i> was previously transferred to the genera <i>Planothidium</i> and <i>Platessa</i>, but the morphology of <i>A. joursacensis</i> 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. <i>Planoplatessa</i> 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.
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