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1 a. Body elongate and narrow with shortened elytra, leaving 5-6 tergites uncovered; prothorax without lateral edges, distinct notopleural and sternopleural sutures; abdomen with 6-7 ventrites; elytra with diffuse true punctation; maxillary lobes reduced . . . Micromalthidae Barber, 1913
1 b. Body more or less oval with complete elytra, completely covering abdominal tergites; prothorax with distinct lateral edges, notopleural and sternopleural sutures; abdomen with 5 ventrites or also with a small ventrite 6; elytra as a rule with seriate remnants of primary cell or rows of punctures (only Crowsoniella Pace, 1976 with indistinct rows of punctures); maxillary lobes raised or reduced . . . 2
2 (1) a. Elytra with trace of primary membrane between thickened veins . . . 3
2 (1) b. Elytra with true punctation, i.e. without trace of primary membrane between heavily sclerotized veins . . . 5
3 (2) a. Procoxal cavities contiguous; abdominal ventrites rather flattened; antennal insertions lateral; tarsomere 4 simple; thoracic underside without grooves for reception of legs; maxillary lobes reduced . . . Ommatidae Sharp et Muir, 1912
3 (2) b. Procoxal cavities separated; abdominal ventrites more or less convex . . . 4
4 (3) a. Prosternum with raised intercoxal process which is narrower than procoxae; antennal insertions dorsal; tarsomere 4 lobed beneath; thoracic underside with distinct grooves for reception of legs; maxillary lobes well raised . . . Cupedidae Laporte, 1836
4 (3) b. Prosternum without distinct intercoxal process and distance between procoxae not narrower than procoxae; antennal insertions lateral; tarsomere 4 simple; thoracic underside without traced grooves for reception of legs . . . Triadocupedidae Ponomarenko, 1966
5 (2) a. Prosternum with distinct process between coxae; metepisternum narrowed posteriorly; abdomen with 5 visible ventrites; antennae with 7 segments; labrum fused with frons; elytra with indistinct rows of punctures; maxillary lobes reduced . . . Crowsonielliidae Iablokoff-Khnzoryan, 1983
5 (2) b. Prosternum without process between contiguous coxae; metepisternum widened posteriorly; abdomen with 6 visible ventrites; antennae with 11 segments; large and free labrum clearly exposed from under frons; elytra with regular rows of dense punctures; maxillary lobes well raised . . . Jurodidae Ponomarenko, 1985