Chromosome-level genome assembly of the clam, Xishi tongue Coelomactra antiquata.

Xishi tongue (Coelomactra antiquata), a commercially valuable marine bivalve, is distributed along the coastal waters of East Asia. In China, significant morphological and genetic differences have been observed between northern and southern populations. Overfishing and pollution have caused a severe decline in its natural populations, rendering the species endangered. In this study, we constructed the first chromosome-level genome of C. antiquata based on PacBio HiFi and Hi-C sequencing data. The assembled genome was 791.83 Mb in size, with the scaffold N50 of 44.05 Mb, and 99.79% of the sequences (790.13 Mb) were anchored to 19 chromosomes. A total of 24,592 protein-coding genes were predicted in the final assembly, of which 89.88% were functionally annotated. The BUSCO analysis revealed a genome completeness of 97.69%. The high-quality genome serves as a critical resource for advancing research on population genetics and germplasm conservation of this commercial shellfish, thereby facilitating sustainable management and conservation efforts.