Planorbella multivolvis, the acorn ramshorn, was a species of small freshwater air-breathing snail, a pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.
| Planorbella multivolvis | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Superorder: | Hygrophila |
| Family: | Planorbidae |
| Genus: | Planorbella |
| Species: | †P. multivolvis
|
| Binomial name | |
| †Planorbella multivolvis (Case, 1847)
| |
This species was endemic to the state of Michigan in the United States.[2] It was last documented in 1907 and is now considered to be extinct.[3][4]
The species was described to science in 1847 by William Case, who used the specific epithet "multivolvis" because the shells of this snail have a greater number of whorls than other members of the genus.[5] The known range of the species was Howe Lake, in Marquette County, Michigan.[2][3] It is thought that the species lived in the deeper waters of the lake, and came to shallow water only for the purposes of spawning.[2] A possible cause of population decline is the introduction of sport fish to Howe Lake, which began in 1905, two years prior to the last known sighting of the species.[3][6] A survey was conducted in 1989 and failed to locate any individuals.[6]
References
edit- ^ Bogan, A.E. (2000). "Planorbella multivolvis". IUCN Red List of Threatened Species. 2000: e.T17480A7093880. doi:10.2305/IUCN.UK.2000.RLTS.T17480A7093880.en. Retrieved 17 November 2021.
- ^ a b c Walker, Bryant (1907). "Notes on Planorbis". The Nautilus. 21: 61–67 – via Biodiversity Heritage Library.
- ^ a b c "Planorbella multivolvis (Acorn ramshorn) - Michigan Natural Features Inventory". mnfi.anr.msu.edu. Retrieved 2020-10-29.
- ^ Bogan, A. E. (2000-06-30). "IUCN Red List of Threatened Species: Planorbella multivolvis". IUCN Red List of Threatened Species. Retrieved 2020-10-29.
- ^ Case, William (1847). "Description of two new species of shells". The American Journal of Science and Arts. 2nd Series. 3: 101 – via Biodiversity Heritage Library.
- ^ a b "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 2020-10-29.
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