The genome sequence of the Osiris Blue, <i>Cupido osiris</i> (Meigen, 1830) (Lepidoptera: Lycaenidae)

We present a genome assembly from a male <i>Cupido osiris</i> (Osiris Blue; Arthropoda; Insecta; Lepidoptera; Lycaenidae). The assembly contains two haplotypes with total lengths of 481.43 megabases and 479.83 megabases. Most of haplotype 1 (98.72%) is scaffolded into 24 chromosomal pseudomolecules, including the Z sex chromosome. Haplotype 2 was assembled to scaffold level. The mitochondrial genome has also been assembled, with a length of 15.36 kilobases. This work is part of Project Psyche, a collaborative programme generating genomes for European butterflies and moths.