It contains the families:

• Alexiidae Imhoff 1856
• Biphyllidae LeConte 1861 (false skin beetles)
• Boganiidae Sen Gupta and Crowson 1966
• Bothrideridae Erichson 1845 (dry bark beetles, bark beetle parasites)
• Byturidae Jacquelin du Val 1858 (fruitworm beetles)
• Cavognathidae Sen Gupta and Crowson 1966
• Cerylonidae Billberg 1820 (minute bark beetles)
• Coccinellidae Latreille 1807 (lady beetles)
• Corylophidae LeConte 1852 (minute fungus beetles)
• Cryptophagidae Kirby 1937 (silken fungus beetles)
• Cucujidae Latreille 1802 (flat bark beetles)
• Discolomatidae Horn 1878
• Endomychidae Leach 1815 (handsome fungus beetles)
• Erotylidae Latreille 1802 (pleasing fungus beetles; include former Languriidae)
• Helotidae Reitter 1876
• Hobartiidae Sen Gupta and Crowson 1966
• Kateretidae Erichson in Agassiz 1846 (short-winged flower beetles) (= Brachypteridae. ICZN Op. 1916, 1999).
• Laemophloeidae Ganglbauer 1899 (lined flat bark beetles)
• Lamingtoniidae Sen Gupta and Crowson 1966
• Latridiidae Erichson 1842 (minute brown scavenger beetles)
• Monotomidae Laporte 1840 (root-eating beetles)
• Myraboliidae
• Nitidulidae Latreille 1802 (sap-feeding beetles)
• Passandridae Erichson 1845 (parasitic flat bark beetles)
• Phalacridae Leach 1815 (shining flower beetles)
• Phloeostichidae Reitter 1911
• Propalticidae Crowson 1952
• Protocucujidae Crowson 1954
• Silvanidae Kirby 1937 (silvanid flat bark beetles)
• Smicripidae Horn 1879 (palmetto beetles)
• Sphindidae Jacquelin du Val 1860 (dry-fungus beetles)