Fig. 2

Genomic characteristics of Conchocele bisecta. A Circos view of 17 linkage groups (corresponding to “pseudo-chromosomes”) showing marker distributions at 2-Mb sliding windows from outer to inner circle: GC content, TE density, tandem repeat density, gene density. B Maximum-likelihood phylogenetic relationships were constructed using the LG+F+R6 substitution model among 28 mollusks with an annelid (Helobdella robusta) as an outgroup. The tree was calibrated at nine nodes (indicated by red dots) using divergence times from TimeTree (http://www.timetree.org). Blue lines indicate 95% confidence intervals for divergence times