| author | date | title | journal / publication | Ax P | 1974 | Die Acoela (Turbellaria) eines Sandstrandes der Nordseeinsel Sylt. | Mikrofauna Meeresboden 32:1-58 |
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| Proxenetes modestus Graff, 1911 | w | latest taxonomic authority | ||
| Unguiphora Nematoplanidae Meixner, 1938 | w | other taxonomic work | ||
| Nematoplanidae Nematoplana Meixner, 1938 | w | latest taxonomic authority | ||
| Trigonostomidae Cryptostiopera Ax, 1974 | w | primary taxonomic authority (describer) | ||
| Cryptostiopera cornuta Ax, 1974 | w | primary taxonomic authority (describer) | ||
| Messoplana falcata valida Ax, 1974 | w | primary taxonomic authority (describer) |