It's safe to assume that Mercenaria is incorrect (oldest species are
Oligocene of eastern North America, largely confined to Americas) but
probably is a venerid. Unfortunately, that's among the most diverse
families of bivalves. I've worked a lot on the Eocene but don't have
anything on Madagascar.
--
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"
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