Fottea 13(2): 105-117, 2013 | DOI: 10.5507/fot.2013.010

Analysis of the type material of Achnanthidium lanceolatum Brébisson ex
Kützing (Bacillariophyta) with the description of two new Planothidium species from the Antarctic Region.

Bart Van de Vijver1,2, Carlos Wetzel3, Kateřina Kopalová4,5, Ralitsa Zidarova6, Luc Ector3
1 National Botanic Garden of Belgium, Department of Bryophyta & Thallophyta, Domein van Bouchout, B-1860 Meise, Bel- gium
2 University of Antwerp, Department of Biology, ECOBE, Universiteitsplein 1, B-2610 Wilrijk, Antwerpen, Belgium
3 Public Research Centre - Gabriel Lippmann, Department of Environment and Agro-biotechnologies (EVA), Rue du Brill, 41, L-4422 Belvaux, Grand-Duchy of Luxembourg
4 Charles University in Prague, Faculty of Science, Department of Ecology, Viničná 7, CZ-12844 Prague 2, Czech Republic
5 Academy of Sciences of the Czech Republic, Institute of Botany, Section of Plant Ecology, Dukelská 135, CZ-37982 Třeboň, Czech Republic
6 St."Kliment Ohridski" University of Sofia, Faculty of Biology, Department of Botany, 8 Dragan Tzankov Blvd., Sofia 1164, Bulgaria

The type material of Achnanthidium lanceolatum (transferred in 1999 to the genus Planothidium) is investigated to reveal the identity of several Planothidium populations from the Antarctic Region. The morphology and the ultrastructure was analysed using light and scanning electron microscopy. The results of this analysis revealed the presence of two so far undescribed Planothidium species in the investigated Antarctic material. Both species are described as new to science: P. rostrolanceolatum Van de Vijver, Kopalová et Zidarova sp. nov. and P. subantarcticum Van de Vijver et C.E.Wetzel sp. nov. The new species can be differentiated based on differences in valve outline and the shape and size of the central area. Planothidium lanceolatum is formally lectotypified. Notes on the ecology and distribution of the new Antarctic species are added.

Keywords: Achnanthidium lanceolatum, Antarctic Region, morphology, new species, Planothidium, type material

Received: February 10, 2013; Accepted: May 17, 2013; Published: September 1, 2013Show citation

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Van de Vijver, B., Wetzel, C., Kopalová, K., Zidarova, R., & Ector, L. (2013). Analysis of the type material of Achnanthidium lanceolatum Brébisson ex
Kützing (Bacillariophyta) with the description of two new Planothidium species from the Antarctic Region. Fottea, 13(2), 105-117. doi: 10.5507/fot.2013.010
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