The genome sequence of the Plain Longtail butterfly, Spicauda simplicius (Stoll, 1807).

We present a genome assembly from an individual female Spicauda simplicius (the Plain Longtail butterfly; Arthropoda; Insecta; Lepidoptera; Hesperiidae). The genome sequence is 610.1 megabases in span. Most of the assembly is scaffolded into 32 chromosomal pseudomolecules, including the Z and W sex chromosomes. The mitochondrial genome has also been assembled and is 15.54 kilobases in length. Gene annotation of this assembly on Ensembl identified 18,506 protein coding genes.