Fottea 2016, 16(2):145-156 | DOI: 10.5507/fot.2016.008

Revision of the Psammothidium germainii complex (Bacillariophyta) in the Maritime Antarctic Region

Bart Van de Vijver1,2,*, Kateĝina Kopalová3, Ralitsa Zidarova4
1 Botanic Garden Meise, Department of Bryophyta & Thallophyta, Nieuwelaan 38, B-1860 Meise, Belgium; *Corresponding author e-mail:bart.vandevijver@plantentuinmeise.be
2 University of Antwerp, Department of Biology, ECOBE, Universiteitsplein 1, B-2610 Wilrijk, Antwerpen, Belgium
3 Charles University in Prague, Faculty of Science, Department of Ecology, Vinièná 7, 12844 Prague 2, Czech Republic; e-mail: k.kopalova@hotmail.com
4 "St. Kliment Ohridski" Univeristy of Sofia, Faculty of Biology, Department of Botany, 8 Dragan Tzankov Blvd., 1164 Sofia, Bulgaria; e-mail: zidarova.r@gmail.com

Psammothidium germainii is a widespread freshwater monoraphid diatom species in the Antarctic Region. Detailed analysis of the populations in the different parts of the Antarctic Region revealed the presence of several species that were lumped under the name 'P. germainii'. The type material of both Achnanthes germainii and Achnanthes ninckei has been investigated to allow a better morphological delimitation of both taxa and to better characterize the new taxa. Two new taxa are proposed: Psammothidium rostrogermainii sp. nov., typical for its rostrate apices and its rather distantly spaced stria pattern, and Psammothidium germainioides sp. nov., formerly identified in Antarctica as Achnanthes ninckei. Both new taxa are illustrated using light and scanning electron micrographs and are compared with similar taxa worldwide. Additionally, two populations of Psammothidium germainii lacking a raphe on the raphevalve are illustrated and discussed.

Keywords: Psammothidium, monoraphid diatoms, Antarctic Region, type material, morphology

Received: January 20, 2016; Accepted: March 21, 2016; Prepublished online: May 16, 2016; Published: October 14, 2016Show citation

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Van de Vijver, B., Kopalová, K., & Zidarova, R. (2016). Revision of the Psammothidium germainii complex (Bacillariophyta) in the Maritime Antarctic Region. Fottea, 16(2), 145-156. doi: 10.5507/fot.2016.008
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