Young ISDR

PINSEEL, E. , VAN DE VIJVER, B. & KOPALOVÁ, K. 2015.    Achanthidium petuniabuktianum sp. nov. ( Achnanthidiaceae, Bacillariophyta ), a new representative of the  A. pyrenaicum  group from Spitsbergen (Svalbard, Archipelago, High Arctic).   Phytotaxa  During a survey of the freshwater littoral diatom flora from lakes and ponds in the region of Petuniabukta on Spitsbergen (Svalbard Archipelago, High Arctic region), a new Achnanthidium species, A . petuniabuktianum sp. nov., has been recorded. Achnanthidium petuniabuktianum is a new representative of the A . pyrenaicum group as evidenced by its curved distal raphe fissures. The present paper describes in detail the morphology of A . petuniabuktianum based on light and scanning electron microscopy. The new taxon is characterized in having linear valves with parallel margins and broadly rounded, never protracted apices and a characteristic—in light microscopy hardly dis...

PINSEEL, E. , KOPALOVÁ, K. & VAN DE VIJVER, B. 2014.    Gomphonema svalbardense  sp. nov, a new freshwater diatom species from the Arctic Region.  Phytotaxa  During a survey of freshwater diatoms from lakes in the region of Petuniabukta on Spitsbergen (Svalbard Archipelago) a new Gomphonema species, G. svalbardense sp. nov., has been recorded. The new taxon was previously cited in the literature as G. angustatum var. undulatum but this identification proved to be erroneous. Detailed morphology description of G. svalbardense based on light and scanning electron microscopy is presented in this paper and the morphological features of the taxon have been compared with similar species. Gomphonema svalbardense is characterized by its typical linear, almost naviculoid outline with undulating margins, with clearly inflated central part,  asymmetric central area, lateral raphe with simple straight proximal endings and the weakly radiate str...

PINSEEL, E. , VANORMELINGEN, P., HAMILTON, P.B., VYVERMAN, W., VAN DE VIJVER, B. & KOPALOVÁ K. 2017.  Molecular and morphological characterization of the Achnanthidium minutissimum complex (Bacillariophyta) in Petuniabukta (Spitsbergen, High Arctic) including the description of A. digitatum sp. nov.   European Journal of Phycology   Recent morphology-based investigations of freshwater Arctic diatoms suggest that many species remain to be discovered, reflecting a unique polar flora. During a survey of the freshwater diatom flora of northern Billefjorden, including the Petuniabukta fjord region (Spitsbergen), several morphodemes belonging to the Achnanthidium minutissimum species complex were recorded. Molecular phylogenies based on rbc L, 28S and 18S sequences, including single cells from Canada and strains from Marion Island (sub-Antarctica) and GenBank revealed the presence of 12 distinct A. minutissimum complex lineages, of which t...