A “pulmonate” snail, this species have evolved their mantle cavity into a lung (instead of gills as still found in some snails). Breathing is through a single opening on the right side of the body which either remains open or opens and closes. One of the largest land snails in BC, the shell has 5 to 6 whorls (spirals) with lighter colored axial ribs (thin bands that cross each whorl). The uppermost whorls are often pale from wear. Shell colour ranges from gold to dark brown, lightening to amber around the aperture (shell opening). As the snail matures the shell can become bleached looking and begin to flake. This species lacks the ‘hairs’ found on the shell of other land snail species like the Pygmy Oregonian and Northwestern Hesperian. The thick white aperture lip of adult snails is evident when viewing the snail from below; juveniles lack this thickened aperture lip. Shell diameter 2.8-3.5 cm, shell diameter is 1.4 to 1.7 times shell height.
A Field Guide to the Lowland Northwest. 2010. [Internet]. Slugs and Snails. - B.C. Conservation Data Centre. 2015. [Internet] Conservation Status Report: Allogona townsendiana. BC MoE. - BC Ministry of Environment, Lands and Parks. 1998. [Internet] Inventory Methods for Terrestrial Arthropods Standards for Components of British Columbia’s Biodiversity No. 40. Resources Inventory Branch for the Terrestrial Ecosystems Task Force. - BC Ministry of Environment. 2007. Draft Gastropod Best Management Practices Guidebook Oregon Forestsnail and Other Land Snails at Risk in the Coastal Lowlands. - Bureau of Land Management. 1999. [Internet] Field Guide to Survey and Manage Terrestrial Mollusk Species from the Northwest Forest Plan. Oregon State Office. - Burke, T.E. 1999. Management recommendations for terrestrial mollusk species. Cryptomastix devia, Puget Oregonian snail. V. 2.0. Prepared for Oregon Bureau Land Management. - COSEWIC. 2013. COSEWIC assessment and status report on the Oregon Forestsnail Allogona townsendiana in Canada. Committee on the Status of Endangered Wildlife in Canada. Ottawa . xii+87pp. - Durand, Ryan,. 2006. Habitat Assessment of the Endangered Oregon Forestsnail, Allogona townsendiani, In the Lower Fraser Valley of British Columbia. Taara Environmental. Prepared for the Fraser Valley Conservancy. - Edworthy, A.B., K.M.M. Steensma, H.M. Zandberg, and P.L. Lilley. 2012. Dispersal, home-range size, and habitat use of an endangered land snail, the Oregon forestsnail (Allogona townsendiana). Can. J. Zool. 90: 875–884. - Environment Canada. 2014. Recovery Strategy for the Oregon Forestsnail (Allogona townsendiana) in Canada [Proposed]. Species at Risk Act Recovery Strategy Series. Environment Canada, Ottawa. XXI pp. + Appendix . - Environment Canada. 2010. Recovery Strategy for the Puget Oregonian Snail (Cryptomastix devia) in Canada. Species at Risk Act Recovery Strategy Series. Environment Canada, Ottawa. iv pp. + Appendix. - Forsyth, Robert G. 2004. Land Snails of British Columbia. Royal BC Museum Handbook. Victoria: Royal BC Museum. 188 pages +  colour plates. - Ovaska, K. and L. Sopuck. 2003. Inventory of rare gastropods in southwestern British Columbia. Report prepared by Biolinx Environmental Research Ltd. for BC Ministry of Water, Land and Air Protection, Victoria, BC. - Ovaska, K. and L. Sopuck. 2003. [Internet] Terrestrial Gastropods as Indicators for Monitoring Ecological Effects of Variable Retention Logging Practices. Pre-disturbance Surveys at Experimental Sites, May –October 2002 Annual Progress Report. Biolinx Environmental Research Ltd. - Ovaska, K. and L. Sopuck. 2006. Surveys of potential Wildlife Habitat Areas for terrestrial gastropods at risk in southwest British Columbia, March 2006. Report prepared by Biolinx Environmental Research Ltd. for the Ministry of Environment, Victoria, BC. - Proulx, Gilbert et al. 2003. A Field Guide to Species at Risk in the Coast Forest Region of British Columbia. Published by International Forest Products and BC Ministry of Environment. Victoria (BC). - Steensma, Karen M.M. et al. 2009. [Internet] Life history and habitat requirements of the Oregon forestsnail, Allogona townsendiana (Mollusca, Gastropoda, Pulmonata, Polygyridae), in a British Columbia population. Invertebrate Biology. 1-11. 2009. - Wikipedia the Free Encyclopedia. 2010. [Internet] The Pulmonata snails. Updated December 29 2010. Sources
First edition prepared in 2010 by Pamela Zevit RPBio for the South Coast Conservation Program (SCCP) with Kristiina Ovaska and Lennart, Sopuck Biolinx Environmental, in partnership with: International Forest Products (Interfor), Capacity Forestry (CapFor). Original funding was made possible through the Sustainable Forestry Initiative (SFI) Revised 2015 by Isabelle Houde, RPBio in consultation with the SCCP.
This project was undertaken with the financial support of the Government of Canada. Ce projet a été réalisé avec l’appui financier du Gouvernement du Canada. Every effort has been made to ensure content accuracy. Comments or corrections should be directed to the South Coast Conservation Program: firstname.lastname@example.org. Only images sourced from “creative commons” sources (e.g. Wikipedia, Flickr, U.S. Government) can be used without permission and for non-commercial purposes only. All other images have been contributed for use by the SCCP and its partners/funders only.
Last updated June 2017