Subgenus-bothriopterus
Guides
Pterostichus adstrictus
Upland Blackclock
Pterostichus adstrictus is a cold-adapted ground beetle with a Holarctic-circumpolar distribution, occurring across subarctic and alpine regions of North America and Eurasia. In North America it ranges from the Bering Sea coast to Newfoundland and south to Pennsylvania, Indiana, South Dakota, New Mexico, and California's Sierra Nevada. European populations were historically known only from northern peripheries (Northern Ireland, Wales, Scandinavia) until discovery in the Austrian Alps, representing a glacial relict with arctic-alpine distribution. The species exhibits stenotopic habitat specificity and has been observed to form locally dense populations despite restricted geographic occurrence.