Abstract
We present a genome assembly from a female Phengaris arion (the Large Blue butterfly; Arthropoda; Insecta; Lepidoptera; Lycaenidae). The genome sequence is 544.50 megabases in length. Most of the assembly is scaffolded into 23 chromosomal pseudomolecules, including the Z sex chromosome. The mitochondrial genome has also been assembled and is 15.7 kilobases in length.