Classification of the genus Costaglycymeris
G. †Costaglycymeris Ward 1992
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†Costaglycymeris drymanos Gardner 1926
†Costaglycymeris mixoni Ward 1992
†Costaglycymeris subovata Say 1824
†Costaglycymeris virginiae Wagner 1848
†Costaglycymeris waltonensis Gardner 1947