Planorbella columbiensis

Planorbella columbiensis
Conservation status
	; Critically endangered, possibly extinct (IUCN 3.1)
	; Possibly Extinct (NatureServe)
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Superorder:	Hygrophila
Family:	Planorbidae
Genus:	Planorbella
Species:	P. columbiensis
Binomial name
	Planorbella columbiensis; (F.C.Baker, 1945)
Synonyms
	Helisoma columbiense F. C. Baker, 1945 ; Planorbella columbiense (F. C. Baker, 1945) ;

Planorbella columbiensis, commonly known as the caribou ramshorn, is a species of freshwater snail found in only one site, on Lac la Hache, in British Columbia, Canada.^[1]^[3]

This species is listed as "possibly extinct".^[1] Its first and last observations were in 1945.^[1]^[4]

Description

Based on the original description, the height of the shell can be as much as 8.7 mm (0.34 in), and its greater diameter 19.1 mm (0.75 in).^[5]^: 222

^ ^a ^b ^c ^d Ormes, M.; Lepitzki, D. (2018) [errata version of 2017 assessment]. "Planorbella columbiensis". IUCN Red List of Threatened Species. 2017 e.T69626424A123785622. doi:10.2305/IUCN.UK.2017-3.RLTS.T69626424A69633178.en.
^ NatureServe. "Planorbella columbiensis". NatureServe Explorer. Arlington, Virginia. Retrieved 16 March 2026.
^ ^a ^b Bieler R, Bouchet P, Gofas S, Marshall B, Rosenberg G, La Perna R, Neubauer TA, Sartori AF, Schneider S, Vos C, ter Poorten JJ, Taylor J, Dijkstra H, Finn J, Bank R, Neubert E, Moretzsohn F, Faber M, Houart R, Picton B, Garcia-Alvarez O, eds. (2024). "Planorbella columbiensis (F. C. Baker, 1945)". MolluscaBase. World Register of Marine Species. Retrieved 23 July 2024.
^ Johnson, P.D.; Bogan, A.E.; Brown, K.M.; Burkhead, N.M.; Cordeiro, J.R.; Garner, J.T.; Hartfield, P.D.; Lepitzki, D.A.W.; Mackie, G.L.; Pip, E.; Tarpley, T.A.; Tiemann, J.S.; Whelan, N.V.; Strong, E.E (2013). "Conservation status of freshwater gastropods of Canada and the United States". Fisheries. 38 (6): 247–282. Bibcode:2013Fish...38..247J. doi:10.1080/03632415.2013.785396.
^ Baker, F.C. (1945). The molluscan family Planorbidae. Urbana: University of Illinois Press. pp. 1–530. doi:10.5962/bhl.title.7026.