Tag Archives: Pupilla

NWT snails 1

Cochlicopa lubrica & Pupilla hudsoniana

Cochlicopa lubrica (left) and Pupilla hudsoniana.

This post begins a series that will cover the land snails of the Northwest Territories, Canada.

Cochlicopa lubrica. Waiting for the rest of the group to finish, and scratching around in the hope to find something, I found this specimen, one of several, around the roots at the base of a tuft of grasses, in a grassy/sedgy swale parallel to the Fort Smith Hwy 5 but also on the highway’s shoulder.


Pupilla hudsoniana. Among the small pupilloids in the NWT is P. hudsoniana. Until recently, this species has been called Pupilla hebes (e.g., Forsyth 2004), and before that P. muscorum of some authors.  A calciphicole (or calciphile), this species is probably common along the Hay River. This specimen was from a dry slope in leaf litter and broken limestone along the river.

 

Hay River near Alexandra Falls, NWT.

Pupilla hebes

Crestless Column

Pupilla hebes

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.

Pupilla muscorum

Widespread Column

Pupilla muscorum

Pupilla muscorum: Along the Saint Lawrence River and chemin des Ancêtres, northeast of quay, Grondines, Portneuf MRC, Québec. Snails were on small pieces of stone along a low bank/outcrop, as well as lower, in areas that clearly would be inundated during spring flood.