First record of Pinnularia bullacostae Krammer & Lange-Bertalot 1999 in proglacial lakes of the European Alps (Italy)

Pinnularia bullacostae Krammer & Lange-Bertalot 1999 is known to colonise soils, lakes and pools mainly in Arctic and Subarctic regions. We describe the first record of Pinnularia bullacostae in the European Alps, including morphological observations and habitat characterisa- tion. The particular environmental conditions induced by the activity of the glacier in proglacial lakes allow for the occurrence of suitable habitats for Pinnularia bullacostae in the Alpine land- scape.