The article reviews the degree of the main taxonomic features expression in the shell of fossil bivalves for various forms of preservation. It is shown that a combination of such forms of preservation as an internal mold and an imprint can often be more preferable than the shell form of preservation for a more complete taxon characterization. For the first time, an image of a bivalve shell with a preserved color pattern is given for the Permian deposits in Northeast Russia.
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