Theliderma stapes

Theliderma stapes, the stirrup shell or stirrupshell, is a species of bivalve in the family Unionidae. It is endemic to eastern Mississippi and western Alabama in the United States, though it is potentially extinct, as it was last observed in 1987.[1][2]

Theliderma stapes

Possibly Extinct  (NatureServe)[1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Unionida
Family: Unionidae
Genus: Theliderma
Species:
T. stapes
Binomial name
Theliderma stapes
(Lea, 1831)
Synonyms

Quadrula stapes (Lea, 1831)

Conservation

This species experienced a population collapse primarily due to river modification in the form of canal construction. In 1976, it was predicted that the construction of the Tennessee–Tombigbee Waterway would cause the extinction of this species. This prediction would quickly come to fruition after the waterway was completed in 1984. Freshly dead shells of this species were last observed in 1987 and further surveys have failed to find any evidence of a surviving population.[1][2]

In 2015, it was proposed to delist this species from the Endangered Species Act. This is done when further efforts to recover a species would almost certainly be futile, and there is no evidence of currently surviving individuals. This species is likely now extinct.[1][2]

gollark: It's an inverted index thingoid. Each term has a compressed bitmap of document IDs. Each document lists the terms in it and their count, and has a probabilistic filter thing for nearness queries.
gollark: There are only a few MB of stuff in there (big documents, not lots of small ones).
gollark: I also haven't checked if it breaks horribly with more than 3 data.
gollark: The code quality of the entire thing is *not ideal*, and it has a few mildly apiaristic limitations, but whatever.
gollark: Muahahaha. At last my pythonous program can submit documents for indexing, ish.

References
  1. Quadrula stapes. The Nature Conservancy.
  2. Stirrupshell (Quadrula stapes) 5-Year Review: Summary and Evaluation. U.S. Fish and Wildlife Service, September 2015


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