↑ abAndreas Hejnol and Mark Q Martindale (2008) Acoel development supports a simple planula-like urbilaterian Philos Trans R Soc Lond B Biol Sci. 2008 April 27; 363(1496): 1493-1501. Published online 2008 January 11. doi: 10.1098/rstb.2007.2239
↑ abAndreas Wallberg, Mikael Thollesson, James S. Farris & Ulf Jondelius (2004). «The phylogenetic position of the comb jellies (Ctenophora) and the importance of taxonomic sampling». Cladistics20 (6): 558-578. doi:10.1111/j.1096-0031.2004.00041.x.
↑von Graff L. von Wilhelm Engelmann; Leipzig, Germany: 1891. Die Organisation der Turbellaria Acoela.
↑Wallberg A, Thollesson M, Farris J.S, Jondelius U. The phylogenetic position of the comb jellies (Ctenophora) and the importance of taxonomic sampling. Cladistics. 2004;20:558–578. doi:10.1111/j.1096-0031.2004.00041.x