Fig. 1

Comparative genomics analyses of Lindaspio polybranchiata and other annelids. A Phylogenetic tree and divergence times of annelids. Gray lines indicate the divergence time with the highest posterior density (HPD); red dots, fossil calibrations. B Venn diagram of spionid and siboglinid gene families. C The top 20 enriched gene ontology (GO) terms among expanded L. polybranchiata gene families