Mactridae, also known as trough shells or duck clams, is a family of marine bivalve clams of the order Veneroida. Genera Anatina Schumacher, 1817 Lutraria Lamarck, 1799 Longimactra Finlay, 1928 Mactra Linnaeus, 1767 Mactrellona Mactromeris Conrad, 1868 Mactrotoma Dall, 1894 Mulinia Gray, 1837 Raeta Gray, 1853 Rangia Desmoulins, 1832 Resania Gray, 1852 Scalpomactra Finlay, 1928 Simomactra Dall, 1894 Spisula Gray, 1837 Tresus Gray, 1853 Zenatia Gray, 1853… (More on Mactridae)