Arctic and North Atlantic.
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Yano, K., J.D. Stevens and L.J.V. Compagno 2004 A review of the systematics of the sleeper shark genus Somniosus with redescriptions of Somniosus (Somniosus) antarcticus and Somniosus (Rhinoscymnus) longus (Squaliformes: Somniosidae). Ichthyol. Res. 51:360-373. (Ref. 50224)
http://www.fishbase.org/references/FBRefSummary.php?id=50224&speccode=138
