Analyses of single copy orthologs
We used OrthoFinder v.1.0.6 (Emms & Kelly, 2019) with a Diamond search (Buchfink, Xie, & Huson, 2015) to identify orthologous groups of genes. All single copy orthologs were aligned with MAFFT (Katoh & Standley, 2013), concatenated with FASconCAT-G (Kück & Longo, 2014), and their relationships visualised with a neighbour net in SplitsTree.