We present a genome assembly from an individual Haliclystus octoradiatus (the spotted kaleidoscope jellyfish; Cnidaria; Staurozoa; Stauromedusae; Haliclystidae). The genome sequence is 262 megabases in span. Most of the assembly (98.3\%) is scaffolded into nine (9) chromosomal pseudomolecules. The mitochondrial genome was also assembled and is 18.3 kilobases in length.