Pseudochromosome construction
To anchor the initial assembly to the chromosome level, a total of 0.69 Gb Hi-C sequencing data were used. Reads pairs are first independently aligned on the reference genome, achieving a mapping ratio between 83% and 89% (Table S1 ). The proportions of unique pairs, total ratio of the multiple and singleton pairs, ratio of unmapping pairs is 58.28%, 39.43%, 2.29%, respectively (Figure S1 ). After filter, the remaining pairs of valid reads is 122,392,006, about 40.18% of the total. At last, the initial assembly was further anchored onto 24 chromosomes (Fig. 1a , b and c ), of which 8 chromosomes have telomeres at both ends, and only 2 chromosomes have 3 gaps in totally (Fig. 1b ).