Fig. 1: Genome assembly of the earthworm.

a A earthworm strain (E. andrei) sequenced by the PacBio platform. b Karyotype of the earthworm. 2n = 22. Chromosomes were classed into three subtypes according to their morphological differences. The karyotype was obtained from metaphase cells in the earthworm clitellum. These analyses were performed by Conservation Genetics CAS Kunming Cell Bank. c Hi–C interactions among 11 chromosomes. Strong interactions were indicated in dark green and weak interactions were indicated in light green. d Circos diagram depicting the characteristics of the earthworm genome. The tracks from outer to inner circles indicated the following: chromosomes, TE coverage, gene coverage, GC contents, gene expression and syntenic block >5 Mb among homologous chromosomes, respectively.