Planorbella multivolvis
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Superorder: Hygrophila
Family: Planorbidae
Genus: Planorbella
Species:
†P. multivolvis
Binomial name
†Planorbella multivolvis
(Case, 1847)

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.

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

  1. ↑ 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.
  2. 1 2 3 Walker, Bryant (1907). "Notes on Planorbis". The Nautilus. 21: 61–67 – via Biodiversity Heritage Library.
  3. 1 2 3 "Planorbella multivolvis (Acorn ramshorn) - Michigan Natural Features Inventory". mnfi.anr.msu.edu. Retrieved 2020-10-29.
  4. ↑ Bogan, A. E. (2000-06-30). "IUCN Red List of Threatened Species: Planorbella multivolvis". IUCN Red List of Threatened Species. Retrieved 2020-10-29.
  5. ↑ 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.
  6. 1 2 "NatureServe Explorer 2.0". explorer.natureserve.org. Retrieved 2020-10-29.


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