Threeridge

Amblema plicata

DIAGNOSTICS 16

SHELL

  • size: large to very large, maximum around 200mm
  • thickness: thick to very thick
  • shape: oval to quadrate, with low wing common on posterior slope
  • width: compressed to moderately inflated
  • surface: three or four, usually well defined and heavy diagonal ridges at mid-shell
  • beaks: anterior, slightly elevated above hinge line.
  • sculptures: about 5 simple looped ridges
  • color/markings: brown to blackish, lacking rays
  • sexual dimorphism: none
  • pseudocardinal teeth: heavy, triangular and serrated. two or three in right valve, two in left.
  • lateral teeth: moderately long and relatively straight
  • nacre: white

Soft parts:

Similar species/lookalikes: The wide diagonal ridges of the discs are diagnostic on their own for this taxon.

DISTRIBUTION/WATERSHEDS 17

ONTARIO

  • Sydenham R.
  • Thames R.
  • Grand R.

Sources and Credits

  1. (c) Jeff Garner, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/53324379
  2. Daderot, no known copyright restrictions (public domain), http://commons.wikimedia.org/wiki/File:Amblema_plicata_-_Royal_Ontario_Museum_-_DSC00194.JPG
  3. (c) pagojoe, some rights reserved (CC BY-NC), uploaded by dbarclay, http://www.inaturalist.org/photos/4432981
  4. (c) pagojoe, some rights reserved (CC BY-NC), uploaded by dbarclay, http://www.inaturalist.org/photos/4432993
  5. (c) Philippe Blais, some rights reserved (CC BY-NC-ND), https://www.inaturalist.org/photos/44043011
  6. (c) Philippe Blais, some rights reserved (CC BY-NC-ND), https://www.inaturalist.org/photos/44045229
  7. (c) Philippe Blais, some rights reserved (CC BY-NC-ND), https://www.inaturalist.org/photos/44045237
  8. (c) Mary Mirasola, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/49334284
  9. (c) Mary Mirasola, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/49334594
  10. (c) Scott Gibson, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/10071881
  11. (c) Jeff Garner, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/53324615
  12. (c) John, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/27776561
  13. (c) John, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/27776564
  14. (c) willbird, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/39350037
  15. (c) willbird, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/39350071
  16. Adapted by Philippe Blais from a work by (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Amblema_plicata
  17. (c) Philippe Blais, some rights reserved (CC BY-SA)

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