There are a variety of fossil and Recent taxa in the Juliidae. If known only from the shells, they are often misidentified as lepton clams. Abbott (1974) lists four species for the U.S.
A few other gastropods may be loosely described as bivalved. The most peculiar is probably Rothpletzia, originally described as an Oligocene rudist. It was a capulid gastropod that secreted an extensive base.
Dr. David Campbell
"Old Seashells"
Biology Department
Saint Mary's College of Maryland
18952 E. Fisher Road
St. Mary's City, MD 20686-3001 USA
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"Mollusks murmured 'Morning!'. And salmon chanted 'Evening!'."-Frank Muir, Oh My Word!