| Contents | Classes | Subclasses | Orders | Suborders | Families |
Family MICROTHORACIDAE Wrzesniowski, 1870
| Syns. | Conchophryidae, Discotrichidae, Drepanomonadidae, Trochiliopsidae |
With characteristics of suborder s.s. (above); but Discotricha dorsoventrally flattened, etc.
| Drepanomonas Fresenius, 1858 (syn. Pseudocristigera). Several spp. |
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| Hemicyclium Eberhard, 1862. Single species. |
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| Microthorax Engelmann, 1862. Many species. |
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| Trochiliopsis Penard, 1922. Single species. |
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| Incertae sedis: | |
| Conchophrys Chatton, 1911, single species; |
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| Discotricha Tuffrau, 1954, single named species (probably two) [quite likely deserves family of its own?] |
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| Hexotricha Conn in Conn & Edmondson, 1918 (syn. Hexotrichia), few species; |
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| Kreyella Kahl, 1931, single species; |
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| Microdiaphanosoma Wenzel, 1953 (for Diaphanosoma), single species. |