References
Faubel, A. (1983) The Polycladida, Turbellaria. Proposal and establishment of a new system. Part I. The Acotylea. Mitteilungenaus dem hamburgischenzoologischen Museum und Institut, 80, 17–121.
ICZN (1999) International Code of Zoological Nomenclature. 4th Edition. The International Trust for Zoological Nomenclature, London, 306 pp.
Scanferla, A., Zaher, H., Novas, F.E., de Muizon, C. & Céspedes, R. (2013) A new snake skull from the Paleocene of Bolivia sheds light on the evolution of Macrostomatans. PLoS ONE, 8 (3), e57583. https://doi.org/10.1371/journal.pone.0057583