Abstract
We present a genome assembly from a female specimen of Ectoedemia decentella (Sycamore-seed Pygmy; Arthropoda; Insecta; Lepidoptera; Nepticulidae). The genome sequence has a total length of 418.14 megabases. Most of the assembly (99.59%) is scaffolded into 31 chromosomal pseudomolecules, including the W and Z sex chromosomes. The mitochondrial genome has also been assembled, with a length of 15.25 kilobases.