Pfleger, M.O., Grubbs, R.D., Cotton, C.F. & Daly-Engel, T.S. (2018) Squalus clarkae sp. nov., a new dogfish shark from the Northwest Atlantic and Gulf of Mexico, with comments on the Squalus mitsukurii species complex. Zootaxa, 4444 (2), 101–119.