Mussel Shell ID

[ToddsPoint]

I PM'd rockyredbaron about id'ing this shell and thought I'd post it here. Fresh water mussel but I've never seen one quite like this. Anyone know the species? Gary

 

[Red James Cash]

Abalone shell.

 

[HuntinDog]

Not an abalone.
It has a mussel scar in the upper right and pseudocardinal tooth on the upper left.
So definitely a clam or mussel.
I don't know what type, but it's a cool one.

 

[Charlie P. (NY)]

Amblema or Ptychobranchus genus?

A mussel of the Uniondae family (both found in US freshwater rivers, as well)

 

[d2]

I'm guessing either a 3 ridge or washboard mussel...d2

 

[ToddsPoint]

I believe it is a washboard. Thanks! Gary