Fottea 2019, 19(1):50-89 | DOI: 10.5507/fot.2018.016

On some common and new cavum-bearing Planothidium (Bacillariophyta) species from freshwater

Carlos E. Wetzel1*, Bart Van de Vijver2,3, Saúl Blanco4, Luc Ector1
1 Luxembourg Institute of Science and Technology (LIST), Environmental Research and Innovation Department (ERIN), 41 rue du Brill, L-4422 Belvaux, Luxembourg; *Corresponding author e-mail: carlos.wetzel@list.lu
2 Meise Botanic Garden, Research Department, Nieuwelaan 38, B-1860 Meise, Belgium
3 University of Antwerp, Department of Biology, ECOBE, Universiteitsplein 1, B-2610 Wilrijk, Antwerpen, Belgium
4 Diatom Lab. IMARENABIO, La Serna 58, 24007 León, Spain

Thirteen Planothidium species are illustrated and discussed in a detailed morphological account based on light and scanning electron microscopy analysis of modern and historic materials related to the names Planothidium rostratum (Østrup) Lange-Bertalot and Planothidium frequentissimum (Lange-Bertalot) Lange-Bertalot. Eight species from freshwater environments in Europe, Asia and South America are proposed as new. All taxa here discussed and illustrated belong to the group of species characterized by the presence of a cavum in the rapheless valve. Additional information concerning their distribution and ecology is briefly commented based on a thorough literature revision.

Keywords: Taxonomy, new species, Planothidium, Achnanthes, Achnanthidiaceae, morphology, type material

Received: October 18, 2018; Accepted: December 30, 2018; Prepublished online: March 4, 2019; Published: April 1, 2019  Show citation

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Wetzel, C.E., Van de Vijver, B., Blanco, S., & Ector, L. (2019). On some common and new cavum-bearing Planothidium (Bacillariophyta) species from freshwater. Fottea, 19(1), 50-89. doi: 10.5507/fot.2018.016
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