Crestless Column

Pupilla hebes. Vicinity of Isaac Lakes, Ruby Range, southern Yukon (Forsyth collection no. 11.007.3920); height of shell: 2.9 mm.

Across much of northern Canada, from the Yukon and northern British Columbia, east through the Northwest Territories to northern Ontario, there is a Pupilla sp. quite unlike Pupilla muscorum of southern Ontario, Quebec, and elsewhere. I’ve provisionally used the name P. hebes for these. Compare with a specimen of Pupilla muscorum in an earlier post.

Update. “Pupilla hebes” was used for this and similar materials that didn’t really match Pupilla muscorum. Recently, P. alaskensis was described from (where else) Alaska; the specimen photographed is this species.