We present a genome assembly from an individual female Spialia rosae (Iberian Red Underwing Skipper; Arthropoda; Insecta; Lepidoptera; Hesperiidae). The assembly contains two haplotypes with total lengths of 384.95 megabases and 329.86 megabases. Most of haplotype 1 (99.98%) is scaffolded into 32 chromosomal pseudomolecules, including the W and Z sex chromosomes. 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.
Hinojosa et al. (2026) studied this question.