Squatina hassei from the Maastrichtian Fox Hills Fm. of Adams County, Colorado (FHSMVP 17990). Squatina hassei from the Maastrichtian Fox Hills Fm. of North Dakota. Image is derived from Hoganson et al. (2019; Bulletins of American Paleontology No. 398) and is used here with permission of the Paleontological Research Institution, which retains the copyright.