A phylogenetic tree based on genetic analyses using partial sequences of the COI gene from 14 botryllid ascidians. The numbers in bold represent bootstrapping values (the likelihood, out of 100 phylogenetic reconstructions, that the same branch would be observed). The coloured frames indicate species that have very similar sequences that are below the 2-3% threshold used to discriminate species (copied from Reem, Douek & Rinkevich, 2018).