Belongs within: Xenacoelomorpha.Contains: Actinoposthiidae, Convolutidae. Our faceless cousins? Published 13 August 2007 A paper has appeared in PLoS One by Philippe et al. on the phylogenetic position of Acoela in the animal evolutionary tree (freely available at the link). Acoela are a smallish group (only a few hundred described species) of marine “worms”, superficially similar… Continue reading Acoela