Pfleger, M.O., Grubbs, R.D., Cotton, C.F. and 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 (Jul. 2018), 101–119. DOI:https://doi.org/10.11646/zootaxa.4444.2.1.