High-quality genome of provides insights into molecular basis of its broad ecological adaptation.

Manuilova, 1964, is a widespread planktonic water flea in Asian freshwater. Although sharing similar ecological roles with species of , studies on . and its congeners are still few and lacking a genome for the further studies. Here, we assembled a high quality and chromosome level genome of by combining long reads sequencing and Hi-C technologies. The total length of assembled genome was 101.8 Mb, with 98.92 Mb (97.2%) anchored into 22 chromosomes. Through comparative genomic analysis, we found the genes, involved in anti-ROS, detoxification, protein digestion, germ cells regulation and protection, underwent expansion in . These genes and their expansion helpfully explain its widespread geographical distribution and dominance in eutrophic waters. This study provides insight into the adaptive evolution of at genomic perspectives, and the present high quality genomic resource will be a footstone for future omics studies of the species and its congeners.