Underwood, C.J. (2002)
Sharks, rays and a chimaeroid from the Kimmeridgian (Late Jurassic) of Ringstead, Southern England. Palaeontology, 45(2), 297–325
DOI: 10.1111/1475-4983.00238
Klug, S. & Kriwet, J. (2013)
Node age estimations and the origin of angel sharks, Squatiniformes (Neoselachii, Squalomorphii). Journal of Systematic Palaeontology, 11(1), 91–110
DOI: 10.1080/14772019.2012.674066
Flammensbeck, C.K. & Pollerspöck, J. & Schedel, F.D.B. & Matzke, N.J. & Straube, N. (2018)
Of teeth and trees: A fossil tip-dating approach to infer divergence times of extinct and extant squaliform sharks. Zoologica Scripta, 47(5), 539–557
DOI: 10.1111/zsc.12299