Great thread! Awesome collection of photos.
Happy to report the two clams pictures attributed to me are of clams I still have, a couple years later. Interestingly enough, the crocea has changed quite a bit in appearance. It's lost most of its grey. I'll see if I can do a "then" and "now" sequence on it.
Here are some additional photos I can add to this thread:
.. And on the topic of clams in public aquariums ... these pictures are a couple years old now, but FWIW, these are some pics I got of a couple clams in Moody Gardens in Galveston, TX: