Chromosome-level genome assembly and annotation of the transverse lady beetle Coccinella transversoguttata

The transverse lady beetle Coccinella transversoguttata Faldermann, 1835 is an ecologically important aphid predator and a declining native biocontrol agent in parts of its range. To provide a genomic resource for evolutionary, ecological, and applied research, we generated a chromosome-level genome assembly using PacBio HiFi long reads, Illumina whole-genome short reads, Hi-C chromatin conformation capture, and full-length transcriptome sequencing. The final assembly spans 376.3 Mb and comprises 58 scaffolds ≥1 kb, of which 363.4 Mb (96.6%) was anchored onto 10 chromosome-scale pseudomolecules. Assembly contiguity was high (contig N50 = 41.6 Mb; scaffold N50 = 41.6 Mb), and completeness was supported by 98.4% complete arthropod BUSCOs. Repetitive sequences constituted 58.2% of the genome, and 13,808 protein-coding genes were annotated with strong transcriptomic and homology-based support. Comparative analysis with a recently published conspecific genome revealed strong chromosome-scale collinearity but notable differences in total assembly size, repeat content, and local structural variation, suggesting either population-level genomic divergence or methodological differences in repeat resolution. Cross-species synteny with Coccinella septempunctata Linnaeus, 1758 further demonstrated substantial conservation of chromosome architecture across the genus. This resource provides a high-quality reference genome with broad utility for comparative genomics, predator ecology, biological control, and genome evolution studies in Coccinellidae.