Northern riffleshell

The northern riffleshell (Epioblasma torulosa rangiana), is a subspecies of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

Northern riffleshell
Epioblasma torulosa rangiana

Critically Endangered  (IUCN 2.3)[1]
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Bivalvia
Order: Unionida
Family: Unionidae
Genus: Epioblasma
Species:
E. torulosa
Subspecies:
E. t. rangiana
Trinomial name
Epioblasma torulosa rangiana
(I. Lea, 1838)

This subspecies is endangered.

This species was formerly found widely in the Ohio River basin, but now the population is fragmented into only three viable groups.

This river mussel needs gravel river beds and swift-flowing, well-oxygenated water. The reduction in range seems to be principally due to damming and the consequential silting up of rivers below the dam and competition from zebra mussels.[2]

Distribution and conservation status

This species lives in Ontario in Canada. It was classified as endangered by COSEWIC. The Canadian Species at Risk Act listed it in the List of Wildlife Species at Risk as being endangered in Canada.[3]

gollark: Also, the latest update to something doesn't show on the user-visible revisions page, which is a minor nitpick but I mildly dislike it.
gollark: This isn't really ideal, as I think I'm duplicating data a bit (timestamps), updating a page involves more work, and more importantly the `revisions` thing doesn't have any relevant information beyond what's available from `pages`.
gollark: Basically, when there's a new revision, the apiosystem reads the current content out of `pages`, compresses it, generates and serializes the metadata, then shoves in a row into `revisions`.
gollark: As of now I do this:```sqlCREATE TABLE pages ( title TEXT NOT NULL UNIQUE, content TEXT NOT NULL, updated INTEGER NOT NULL, created INTEGER NOT NULL);CREATE TABLE revisions ( page TEXT NOT NULL REFERENCES pages(title), timestamp INTEGER NOT NULL, meta BLOB NOT NULL, -- contains revision metadata and type -- ChangeContent { size } is the only one here for now full_data BLOB -- contains optionally compressed text);```but it is not ideal.
gollark: Yes. Please hold on while I post the schæma.

References
  1. Bogan (2000). "Epioblasma torulosa ssp. rangiana". IUCN Red List of Threatened Species. 2000. Retrieved 11 May 2006.CS1 maint: ref=harv (link) Database entry includes a brief justification of why this subspecies is critically endangered and the criteria used
  2. Report from NatureServe Explorer
  3. COSEWIC. 2005. Canadian Species at Risk. Committee on the Status of Endangered Wildlife in Canada. 64 pp., page 13.


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