Fig. 1
From: Massive gene presence-absence variation shapes an open pan-genome in the Mediterranean mussel
Species tree obtained from the concatenation of 177 widespread single-gene families. In bold, we highlight the genome sequenced in this study. All branches were very well supported (aLRT > 0.99) except those with a number in red. In the tree, Bivalvia is a sister lineage to Gastropoda, with both molluscan classes forming a clade sister to Cephalopoda. Mollusca appears as a sister branch of a clade containing Phoronida (Phoronis), Nemertea (Notospermus), and Brachiopoda (Lingula) with low support (0.50). Open circles represent duplication rates (genome-wide average number of duplications per gene). Yellow circles represent the estimated duplication rates before removing large expansions consisting of more than 20 paralogs appearing in a single node. Green circles represent the duplication rates obtained after the removal of such events. Black circles serve as a scale and correspond to a duplication rate of 1