I guess it all depends on your measurement criteria. What is the largest
living bivalve?  Everyone knows the answer to that one - Tridacna gigas!
However, the largest recorded Kuphus polythalamia is about 160 mm (more than
6 inches) longer than the largest known Tridacna.  So maybe Kuphus is the
"largest" bivalve?  Of course, the weight of the record Tridacna would be
about 200 times the weight of the record Kuphus. So, if weight if the
criterion, Tridacna is the clear winner.

Again, are a 300 mm Cassis madagascariensis and a 300 mm Fusinus longissimus
"the same size"?  They sure don't look the same size, since the Cassis is
over 250 mm in diameter, while the Fusinus is about 70 mm in diameter.

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