Round Pigtoe

Pleurobema sintoxia

DIAGNOSTICS 5

SHELL

  • size: mid-sized: maximum 130 mm, most under 70 mm
  • thickness: thick
  • shape: triangular to oval; rounded ventral edge, more rarely straight or slightly concave
  • width: moderately compressed to inflated
  • surface: smooth
  • color/markings: pale to dark brown
  • beaks: elevated, close to anterior; sculptures: few, faint ridges
  • sexual dimorphism: none
  • pseudocardinal teeth: large, heavy
  • lateral teeth: strong
  • nacre: white, occasionally pink

Soft parts: white

Similar species/lookalikes: Most similar with Fusconaia flava, with which it is most often confused. In F. flava the beaks are situated closer to mid-shell, and the posterior ventral edge is usually concave in mature specimens, more rarely straight. Nacre in F. flava is usually white, more rarely with a salmon tinge, and periostracum is paler brown.

DISTRIBUTION/WATERSHEDS 6

ONTARIO
Lake Huron-St-Clair dr.:

  • Ausable R.
  • Sydenham R.
  • Thames R.
    Lake Erie dr.:

  • Grand R.

Sources and Credits

  1. (c) Philippe Blais, some rights reserved (CC BY-NC-ND), uploaded by Philippe Blais
  2. (c) Matthew Ireland, all rights reserved, uploaded by Matthew Ireland
  3. (c) Jesse Weinzinger, some rights reserved (CC BY-NC), uploaded by Jesse Weinzinger
  4. (c) dbarclay, some rights reserved (CC BY-NC), uploaded by dbarclay
  5. Adapted by Philippe Blais from a work by (c) Wikipedia, some rights reserved (CC BY-SA), http://en.wikipedia.org/wiki/Pleurobema_sintoxia
  6. (c) Philippe Blais, some rights reserved (CC BY-SA)

More Info

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