Pfleger, Mariah O., R. Dean Grubbs, Charles F. Cotton, and Toby S. Daly-Engel. 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). Auckland, New Zealand:101–119. https://doi.org/10.11646/zootaxa.4444.2.1.