Figure 17. Phylogenetic trees. A) The thecostracan phylogeny. (Adapted from Ewers-Saucedo et al. 2019) B) The thoracican phylogeny. Sessilia evolved more than once from the pedunculate barnacles and thus it is not monophyletic. This is because the sessile Neoverrucidae (within Verrucomorpha) and the monophyletic group, Verrucidae (within Verrucomorpha) and Balanomorpha evolved independently from the pedunculate ancestors. (Adapted from Pérez-Losada et al. 2008)