| Actinoposthiidae Actinoposthia An der Lan, 1936 | [with synonyms] | w | latest taxonomic authority | |
| Actinoposthiidae Archactinoposthia Dörjes, 1968 | [with synonyms] | w | latest taxonomic authority | |
| Actinoposthiidae Atriofronta Dörjes, 1968 | [with synonyms] | w | latest taxonomic authority | |
| Mecynostomidae Childia Graff, 1910 | [with synonyms] | w | other taxonomic work | |
| Childia groenlandica (Levinsen, 1879) | [with synonyms] | w | other taxonomic work | |
| Actinoposthiidae Microposthia Faubel, 1974 | [with synonyms] | w | latest taxonomic authority | |
| Actinoposthiidae Paraproporus Westblad, 1945 | [with synonyms] | w | latest taxonomic authority | |
| Actinoposthiidae Paractinoposthia Ehlers & Doerjes, 1981 | [with synonyms] | w | latest taxonomic authority | |
| Actinoposthiidae Pelophila Dörjes, 1968 | | w | other taxonomic work | |
| Dakuidae Philactinoposthia Dörjes, 1968 | [with synonyms] | w | other taxonomic work | |
| Actinoposthiidae Pseudactinoposthia Dörjes, 1968 | [with synonyms] | w | latest taxonomic authority | |
| Actinoposthiidae Tetraposthia An der Lan, 1936 | | w | latest taxonomic authority | |
| Pseudactinoposthia sanguineum (Beklemischev, 1915) | [with synonyms] | w | latest taxonomic authority | |
| Eumecynostomum sanguineum (Beklemischev, 1915) | | w | latest taxonomic authority | |
| Actinoposthiidae Childianea Faubel & Cameron, 2001 | [with synonyms] | w | latest taxonomic authority | |
| Childiidae Actinoposthia An der Lan, 1936 | | - | latest taxonomic authority | |
| Childiidae Archactinoposthia Dörjes, 1968 | | - | latest taxonomic authority | |
| Childiidae Atriofronta Dörjes, 1968 | | - | latest taxonomic authority | |
| Childiidae Childianea Faubel & Cameron, 2001 | | - | latest taxonomic authority | |
| Childiidae Microposthia Faubel, 1974 | | - | latest taxonomic authority | |
| Childiidae Paractinoposthia Ehlers & Dörjes, 1981 | | - | latest taxonomic authority | |
| Childiidae Paraproporus Westblad, 1945 | | - | latest taxonomic authority | |
| Childiidae Pelophila (Dörjes, 1968) | | - | latest taxonomic authority | |
| Childiidae Philactinoposthia Dörjes, 1968 | | - | latest taxonomic authority | |
| Childiidae Pseudactinoposthia Dörjes, 1968 | | - | latest taxonomic authority | |
| Acoela Actinoposthiidae Hooge, 2001 | | w | primary taxonomic authority (describer) | |
| Praeconvoluta tigrinus Hooge, 2001 | | w | primary taxonomic authority (describer) | |
| Conaperta hortula Hooge, 2001 | | w | primary taxonomic authority (describer) | |
| Aphanostoma brusca Hooge, 2001 | | w | primary taxonomic authority (describer) | |
| Pseudmecynostomum phocum Hooge, 2001 | | w | primary taxonomic authority (describer) | |
| Microdalyellia blodgetti (Silliman, 1884) | | w | other taxonomic work | |