P. crassicauda (Tullberg, 1871)

– Isotoma crassicauda Tullberg, 1871: 152

AK Hurd & Lindquist 1958; Christiansen & Bellinger 1980, 1998; Danks 1981; Skidmore 1995; Babenko & Fjellberg 2006 NS Babenko, unpubl.

Remarks: The specimens from Alaska slightly differ from the main European form in the mucro shape (Christiansen & Bellinger 1980) and may represent a separate species.

General distribution: Holarctic.