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Valid name
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Laevicardium crassum
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| Synonym | Cardium crassum Gmelin, 1791 |
| Synonym | Cardium norvegicum var. rotunda Jeffreys, 1864 |
| Synonym | Cardium serratum sensu Lamarck, 1819 non Linné, 1758 |
| Synonym | Cardium pennanti Reeve, 1844 ; Reeve, 1844 ex Beck ms |
| Synonym | Cardium norvegicum var. mediterranea B.D.D., 1892 |
| Synonym | Cardium norvegicum var. pallida Jeffreys, 1864 non Cardium pallidum Reeve, 1845 |
| Synonym | Cardium laevigatum sensu auct. non Linné, 1758 |
| Synonym | Cardium norvegicum Spengler, 1799 |
| Synonym | Cardium norvegicum var. marmorata B.D.D., 1892 |
| Synonym | Cardium vitellinum Reeve, 1844 |
| Synonym | Cardium norvegicum var. lineolata B.D.D., 1892 non Cardium lineolatum Reuss, 1844 |
| Synonym | Cardium europeum Swainson, 1840 |
| Synonym | Cardium norvegicum var. devians B.D.D., 1892 |
| Synonym | Cardium norvegicum var. gibba Jeffreys, 1864 non Cardium gibbum Defrance, 1817 |
| Synonym | Cardium norvegicum var. ponderosa B.D.D., 1892 |