Ohio Pigtoe - Pleurobema cordatum, with its larger offering of tender succulent flesh.
Okay JV. Ya got me. I propose a swap. A pick-up load of them there pig-feet clams, and I'll swap you for a 9"X14" pan of huckleberry cheesecake. That should be about an even swap. I'll even toss in a hundredweight of 'taters if you'll deliver.