Planorbella multivolvis
Species of gastropod
From Wikipedia, the free encyclopedia
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  | |
| 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.[3] It was last documented in 1907 and is now considered to be extinct.[4][1]
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.[3][4] 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.[3] 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.[4][2] A survey was conducted in 1989 and failed to locate any individuals.[2]
