| author | date | title | journal / publication | Obst M, Nakano H, Bourlat SJ, Thorndyke MC, Telford MJ, Nyengaard JR, et al. | 2011 | Spermatozoon ultrastructure of Xenoturbella bocki (Westblad 1949). | Acta Zool. 92: 109–15 |
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| Xenoturbella bocki Westblad, 1949 | [with synonyms] | w | other research on this sp. |