salamander mussel

Simpsonaias ambigua

Diagnostics 10

SHELL

  • size: very small to small
  • thickness: thin in posterior, thickened in anterior
  • shape: elliptical, elongate, both ends rounded. dorsal and ventral margins straight and parallel.
  • width: lightly inflated
  • surface: smooth
  • beaks: slightly elevated. sculptures: 4-5 fine/obscured V-shaped ridges
  • color/markings: uniform tan to dark brown; rayless
  • sexual dimorphism: none
  • pseudocardinal teeth: very small, flattened
  • lateral teeth: absent
  • nacre: white, salmon towards beaks

Soft parts: white

Similar species/lookalikes: The diminutive size, hinge dentition and thickened anterior shell usually makes identification of this rare species straightforward. Could initially resemble young floaters, but only one of those, the alewife floater, shares a thickened anterior shell but lacks any hinge teeth, and its distribution is far removed from the former.

DISTRIBUTION/WATERSHEDS 11

ONTARIO

  • Sydenham R.

Sources and Credits

  1. (c) Philippe Blais, some rights reserved (CC BY-NC-ND), https://www.inaturalist.org/photos/56846766
  2. (c) Matthew Ireland, some rights reserved (CC BY-NC), http://inaturalist.ca/photos/7613397
  3. (c) Andrew Hoffman, some rights reserved (CC BY-NC-ND), https://www.flickr.com/photos/71701055@N00/8955448724/
  4. (c) Andrew Hoffman2013, some rights reserved (CC BY-NC-ND), uploaded by Philippe Blais, https://www.inaturalist.org/photos/13731699
  5. (c) Pat Deacon, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/7926976
  6. (c) Pat Deacon, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/7926983
  7. (c) Philippe Blais, some rights reserved (CC BY-NC-ND), https://www.inaturalist.org/photos/56846754
  8. (c) Philippe Blais, some rights reserved (CC BY-NC-ND), https://www.inaturalist.org/photos/56846759
  9. (c) Scott Gibson, some rights reserved (CC BY-NC), https://www.inaturalist.org/photos/10071862
  10. Adapted by Philippe Blais from a work by (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Simpsonaias_ambigua
  11. (c) Philippe Blais, some rights reserved (CC BY-SA)

More Info

iNatCA Map