A large and diverse group of beetles, about 30 families. About 20 families are represented in Russia, including Nitidulidae (300 species in Russia), Cryptophagidae (180 species in Russia), Coccinellidae (152 species in Russia) and others.
- † Family: Parandrexidae Kirejtshuk, 1993
- Family: Protocucujidae Crowson, 1954
- Family: Tinder ( Sphindidae Jacquelin du Val, 1858 )
- Family: Helotidae Reitter / Chapuis, 1876
- Family: Sparkle (bug) ( Nitidulidae Latreille , 1802 )
- Family: Boganiidae Gupta & Crowson, 1966
- Family: Monotomids ( Monotomidae Laporte, 1840 )
- Family: Catheterids ( Kateretidae Erichson, 1844 )
- Family: Smicripidae Horn, 1879
- Family: Phloeostichidae Reitter, 1911
- Family: Silvanids ( Silvanidae Kirby, 1837 )
- Family: Passandridae Erichson / Blanchard, 1845
- Family: Flatbodies ( Cucujidae Latreille, 1802 )
- Family: Laemophloeidae Ganglbauer, 1899
- Family: Propalticidae Crowson, 1952
- Family: Bilys (bugs) ( Phalacridae Leach, 1815 ) (Falacrida)
- Family: Hobartiidae Gupta & Crowson, 1966
- Family: Cavognathidae Gupta & Crowson, 1966
- Family: Sneaky Eaters ( Cryptophagidae Kirby, 1837 )
- Family: Lamingtoniidae Sen Gupta & Crowson, 1966
- Family: Lizard Beetles ( Languriidae Crotch, 1873 ) (Langurids)
- Family: Cryptophilidae Casey, 1900
- Family: Mushrooms ( Erotylidae Latreille , 1802 ) (including Cryptophilidae, Dacnidae, Languriidae, Loberidae, Pharaxonothidae, Tritomidae, and Xenoscelidae)
- Family: Dacnidae Gistel, 1856
- Family: Raspberries (beetles) ( Byturidae Jacquelin du Val, 1858 ) (Raspberry beetles)
- Family: Bifillids ( Biphyllidae LeConte, 1861 )
- Family: Bothrideridae Erichson, 1845
- Family: Cerilonids ( Cerylonidae Billberg, 1820 ) (Sharousy)
- Family: Alexiidae Imhoff, 1856
- Family: Discolomatidae Horn, 1878
- Family: Moldworms ( Endomychidae Leach, 1815 )
- Family: Ladybugs ( Coccinellidae Latreille , 1807 )
- Family: Rotters ( Corylophidae LeConte, 1852 )
- Family: Latridiidae Erichson, 1842
- Family: Akalyptoischiidae Lord et al. , 2010 [2]
