The genome sequence of a stiletto fly, Thereva unica (Harris, 1780).

We present a genome assembly from an individual female Thereva unica (a stiletto fly; Arthropoda; Insecta; Diptera; Therevidae). The genome sequence is 910.1 megabases in span. Most of the assembly is scaffolded into 6 chromosomal pseudomolecules. The mitochondrial genome has also been assembled and is 17.66 kilobases in length.