Cerion nanus

Cerion nanus is a species of medium-sized air-breathing land snail, a terrestrial pulmonate gastropod in the family Cerionidae.

Cerion nanus

Critically Endangered  (IUCN 2.3)[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
clade Eupulmonata
clade Stylommatophora
informal group Sigmurethra
Superfamily:
Urocoptoidea
Family:
Cerionidae
Genus:
Cerion
Species:
C. nanus
Binomial name
Cerion nanus

Distribution and Ecology

This species is endemic to the island of Little Cayman, Cayman Islands in the Caribbean Sea[3], where it is found among Evolvulus arbuscula and E. squamosum plants[4], which grow in this coastal dry limestone shrub. Shells were found in 1975 at three sites, encompassing a total area of 35,000 m2 surrounding the North Shore Track. It is sympatric throughout its range with Cerion pannosum, a species with a much larger distribution and shell-size, which has probably ecologically replaced C. nanus. However, this replacement has not yet occurred, suggesting that this species may have never had a larger population. Currently several small populations exist along the Spot Bay Road in numbers far larger than originally suspected.[5]

gollark: Task Manager in Windows, loads of programs under GNU/Linux, some sort of insanity on Mac OS(X).
gollark: Have you *never* looked at that?
gollark: Surely you must have some idea. They're in Task Manager.
gollark: What are the actual *specs*, though?
gollark: For example, because of a better scheduler and stuff Threadripper (some Ryzen stuff too?) ran significantly better under Linux for a while, I think.

References
  1. Hounsome M. (1996). Cerion nanus. 2006 IUCN Red List of Threatened Species. Archived June 27, 2014, at the Wayback Machine Downloaded on 6 August 2007.
  2. "The Rarest Snail in the World". American Scientist. Archived from the original on 14 May 2014. Retrieved 14 May 2014.
  3. "The IUCN Red List of Threatened Species". IUCN Red List of Threatened Species. Retrieved 2019-02-04.
  4. "The Rarest Snail in the World". American Scientist. 2017-02-06. Retrieved 2019-02-04.
  5. Hounsome; Askew (1980). "CERION NANUS (MAYNARD) (MOLLUSCA : CERIONIDAE ) ON LITTLE CAYMAN" (PDF). Atoll Research Bulletin. 241: 91–96. doi:10.5479/si.00775630.241-9.91 – via Smithsonian National Museum of Natural History.

Further reading


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