Somniosus microcephalus is found in the north Atlantic, from the coast of New England and Canada to Scandinavian waters. They occasionally venture as far south as the mouth of the Seine River in France. (Compagno and Fowler, 2005; Compagno, 1984)
- Compagno, L. 1984. FAO Species Catalogue Volume 4:Sharks of the World. Rome: United Nations Development Programme.
- Compagno, L., S. Fowler. 2005. Sharks of the World. Princeton, New Jersey: Princeton University Press.