Fig. 3

Phylogenetic tree to illustrate the evolution of the Tektin complement in metazoan species. This phylogenetic analysis includes the full Tektin complements identified in selected metazoan species including four xenacoelamorphans (Cma, Ipu, Mst, Xbo), six ecdysozoans (Ae, Ame, Bt, Dm, Tc, Zn), four spiralian species (Cg, Ct, La, Pd), three invertebrate deuterostomes (Sk, Sp, Bf), and six vertebrate deuterostomes (Ap, Cpb, Gg, Mm, Oa, Hs), as well as two nonbilaterians (Aq, Nv), one choanoflagellate (Sr) and a green algae (Chr) as an outgroup. Both Bayesian and Maximum Likelihood analyses were performed using Mr. Bayes and RAxML, respectively. The Bayesian tree topology is shown. Node support is shown for non-terminal nodes. Posterior probability values from Mr. Bayes and bootstrap values from RAxML are shown above or below each node, respectively. Diamonds indicate support less than 80%. “X” under a node indicates that this node was not recovered in the RAxML maximum likelihood tree. Tree was rooted with green algae (Chr) Tektin. The large colored boxes highlight the four major Tektin classes that exist in bilaterians, Tektin-2 (green), Tektin-4 (light blue), Tektin-1 (yellow), and Tektin-3/5 (purple), the nonbilaterian class Tektin-1/4/3/5 (orange) and the ancestral non-metazoan Tektin-2/1/4/3/5 (pink). The smaller colored boxes within the Tektin-3/5 class group Tektins that belong to higher taxa as indicated to highlight the three independent duplications of Tektin-3/5 at the base of the ecdysozoan hymenopterans (Tektin-3/5a and − 3/5b), the spiralians (Tektin-3/5A and 3/5B), and the deuterostome vertebrates (Tektin-3 and Tektin-5). All metazoans share Tektin-2 while the nonbilaterian Tektin-1/4/3/5 is sister group to the three exclusively bilaterian Tektin classes Tektin-1, Tektin-4, and Tektin-3/5. Tektins are named according to the groups recovered by this phylogenetic analysis. Species abbreviations and accession numbers for each sequence are provided in Additional file 5