Selenocheir arcuata is a species of Xystodesmid millipede found in Northern California.

[1][2] The species was first described by Rowland M. Shelley in 1994 based on samples collected by C. Smith, J. Clover, and F. Ennik in 1972.

[3] Selenocheir arcuata is typically brown to black in ground color with yellow paranota.

[3] The shape of the paranota distinguishes S. arcuata from Harpaphe haydeniana which is also present in most of its distribution; H. haydeniana has been described to have acutely angled caudolateral corners.

[4] S. arcuata is found in the foothills northwest of the Sacramento Valley and down into the northern Coast Range as far south as Mendocino County.