| author | date | title | journal / publication | Rieger RM, Ladurner P | 2001 | Searching for the stem species of the Bilateria. | Belg J Zool 131 (Suppl 1): 27-34 |
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| Xenacoela Acoela Uljanin, 1870 | w | other research on this sp. | 27-34 | |
| Macrostomorpha Macrostomida Karling, 1940 | w | other research on this sp. | 27-34 |