Abstract
Four monoraphid taxa belonging to the genera Achnanthes , Psammothidium and Planothidium were found during the ongoing taxonomic revision of the freshwater and limno-terrestrial diatoms of the Maritime Antarctic region. The present paper describes these four taxa as new based on detailed light and scanning electron microscopy observations: Achnanthes kohleriana Kopalova, Zidarova & Van de Vijver sp. nov., Planothidium wetzelectorianum Kopalova, Zidarova & Van de Vijver sp. nov., Psammothidium confusoneglectum Kopalova, Zidarova & Van de Vijver sp. nov. and Psammothidium superpapilio Kopalova, Zidarova & Van de Vijver sp. nov. The morphology and ecology of all four taxa are discussed and the species are compared with morphologically similar taxa.
Highlights
The past 10 years, the non-marine diatom flora of the Maritime Antarctic Region has been undergoing a serious revision following a fine-grained taxonomy that has been widely accepted nowadays
Five genera have been regularly observed in Antarctic samples: Achnanthes Bory s.s., Achnanthidium Kütz., Karayevia Round & Bukht., Planothidium Round & Bukht. and Psammothidium Bukht. & Round representing a total of 38 different species (Oppenheim 1994; Van de Vijver et al 2002; Sabbe et al 2003; Le Cohu 2005; Ohtsuka et al 2006)
The present paper continues the studies on monoraphid diatom species in Antarctica and describes four new monoraphid taxa belonging to the genera Achnanthes s.s., Planothidium and Psammothidium based on detailed light and scanning electron microscopy observations: Achnanthes kohleriana Kopalová, Zidarova & Van de Vijver sp. nov., Planothidium wetzelectorianum Kopalová, Zidarova & Van de Vijver sp. nov., Psammothidium confusoneglectum Kopalová, Zidarova & Van de Vijver sp. nov. and Psammothidium superpapilio Kopalová, Zidarova & Van de Vijver sp. nov
Summary
The past 10 years, the non-marine diatom flora of the Maritime Antarctic Region has been undergoing a serious revision following a fine-grained taxonomy that has been widely accepted nowadays. In 2014, Van de Vijver & Kopalová revised the genus Achnanthidium in the entire Antarctic region describing two new species. The present paper continues the studies on monoraphid diatom species in Antarctica and describes four new monoraphid taxa belonging to the genera Achnanthes s.s., Planothidium and Psammothidium based on detailed light and scanning electron microscopy observations: Achnanthes kohleriana Kopalová, Zidarova & Van de Vijver sp. The present paper continues the studies on monoraphid diatom species in Antarctica and describes four new monoraphid taxa belonging to the genera Achnanthes s.s., Planothidium and Psammothidium based on detailed light and scanning electron microscopy observations: Achnanthes kohleriana Kopalová, Zidarova & Van de Vijver sp. nov., Planothidium wetzelectorianum Kopalová, Zidarova & Van de Vijver sp. nov., Psammothidium confusoneglectum Kopalová, Zidarova & Van de Vijver sp. nov. and Psammothidium superpapilio Kopalová, Zidarova & Van de Vijver sp. nov
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