We present a genome assembly from an individual male Siphlonurus alternatus (the Northern Summer Mayfly; Arthropoda; Insecta; Ephemeroptera; Siphlonuridae). The genome sequence is 455.8 megabases in span. Most of the assembly is scaffolded into 11 chromosomal pseudomolecules, including the X sex chromosome. The mitochondrial genome has also been assembled and is 19.36 kilobases in length.
Keywords: Ephemeroptera; Northern Summer Mayfly; Siphlonurus alternatus; chromosomal; genome sequence.
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