Gillis, J.A. & Rawlinson, K.A. & Bell, J. & Lyon, W.S. & Baker, C.V.H. & Shubin, N.H. (2011)
Holocephalan embryos provide evidence for gill arch appendage reduction and opercular evolution in cartilaginous fishes.
Proceedings of the National Academy of Sciences of the United States of America, 108(4), 1507–1512 DOI: 10.1073/pnas.1012968108