E-Fauna BC: Electronic Atlas of the Wildlife of British Columbia

Planogyra clappi (Pilsbry, 1864)
Western Flat-Whorl
Family: Valloniidae
Species account author: Robert Forsyth.
Photo of species

© Robert Forsyth  Email the photographer   (Photo ID #7361)

E-Fauna BC Static Map
Distribution of Planogyra clappi in British Columbia
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Species Information


Shell minute, brown, flat-spired, and bearing widely and rather evenly spaced lamellar ribs. The shell is smaller, with a flatter spire and broader umbilicus than for Paralaoma servilis which it resembles. Shell minute, disc-shaped; brown, with widely spaced lamellar ribs and finer growth and spiral lines; umbilicus ca. 1/3 of the shell width; apertural lip thin.


Planogyra clappi lives in rich, moist, predominantly deciduous forests. It is usually found by searching in leaf litter (Forsyth 2004). It has been found from near sea level to elevations up to 560 m in BC.


Global range

Haida Gwaii, BC (Forsyth 2004), to Trinity and Mendocino counties, California (Roth 1985, Roth and Sadeghian 2006); northern Idaho (Frest and Johannes 2001).

BC range

Haida Gwaii and northern Vancouver Island, south along the BC coast. The species also likely occurs on the mainland North Coast of BC, an area that is under-surveyed for terrestrial molluscs, especially micro-snails. Planogyra clappi should also be expected from the wet southern Interior mountains.


Pacific Maritime.


Early records of Patula asteriscus or Pyramidula asteriscus from BC and Washington state (e.g., Dall 1905) refer to this species instead. Planogyra asteriscus is the eastern North American species.



Genus name is from the Latin, "planus" (flat) and Greek "gyros" (whorl or turn); the gender is masculine. The species is named after George W. Clapp (1859-1949), an American naturalist.

Status Information

Origin StatusProvincial StatusBC List
(Red Blue List)
NativeS4YellowNot Listed
BC Ministry of Environment: BC Species and Ecosystems Explorer--the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

Punctum clappi Pilsbry, 1898

Additional Range and Status Information Links

Additional Photo Sources

General References

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2021. E-Fauna BC: Electronic Atlas of the Fauna of British Columbia [efauna.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2022-01-21 11:37:55 PM]
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© E-Fauna BC 2021: An initiative of the Spatial Data Lab, Department of Geography, UBC