Student Project Figures Figure 26 The phylogenetic position of the Tunicata based on 18S RNA (18S ribosomal RNA is a component of all eukaryotes and the genes that comprise it are often used to reconstruct phylogenies). The Vertebrata are denoted by the red box and the Styelidae, the family to which the genus Botrylloides belongs, is demarcated by a blue box (adapted from Holland, 2016).  Figure 26