Pupilla alaskensis

Pupilla (Pupilla) alaskensis Nekola & Coles in Nekola, Coles & Horsák, 2014
Alaska Column

  • Pupilla alaskensis Nekola & Coles in Nekola et al. 2015 [first made available online, 2014]: 209, fig. 6A–H, K.
Pupilla hebes; Isaac Lakes, Ruby Range, Yukon (RGF 11.007.3920), height 2.9 mm.

Identification. Shell subcylindrical-ovoid. Spire tall, with convex sides; apex bluntly rounded. Whorls ca 6, rather convex. Periphery medial, less so on last whorl. Suture moderate to deep. Protoconch microscopically granular. Teleoconch with widely spaced, sharp irregular, anastomosing colabral threads, usually minutely lamellar. Aperture ca ¼ of shell height, subovate, usually edentulous, occasionally with a small, plate-like columellar lamella. Last whorl ascending to adult peristome. Adult lip flared, thin-edged. Last whorl slightly contracted behind adult lip. Crest absent or weak but not callused. Umbilicus rimate (closed). Shell with silky-dull lustre; opaque to translucent; yellow- to cinnamon-brown; lip pale. Height to 2.6–3.3 mm (higher than wide).

Animal presumably like Pupilla muscorum.

Habitat. Under dead wood and rocks, especially common in open, dry habitats such as roadsides. Calcareous habitats.

Canadian range. Yukon and northwest British Columbia (near Atlin) (unpubl. data).

Etymology. Named after Alaska.

Remarks. This species was recently described from Alaska (Nekola et al. 2015). Some specimens from north-western British Columbia and all from Yukon, previously identified as P. hebes (Forsyth 2004), are this species. Indications of P. muscorum in Yukon (Henderson 1927) are likely P. alaskensis, although P. hudsoniana cannot be ruled out.

  • Forsyth RG (2004) Land Snails of British Columbia. Royal BC Museum Handbook. Royal British Columbia Museum, Victoria, iv + 188 + [8] pp.
  • Henderson J (1927) Mollusk notes from the northwest. The Nautilus 40: 75–78.
  • Nekola JC, Coles BF, Horsák M (2015) Species assignment in Pupilla (Gastropoda: Pulmonata: Pupillidae): integration of DNA-sequence data and conchology. Journal of Molluscan Studies 81: 196–216