Mannering, A.A. & Hiller, N. (2008)
An Early Cenozoic neoselachian shark fauna from the Southwest Pacific. Palaeontology, 51(6), 1341–1365
DOI: 10.1111/j.1475-4983.2008.00812.x

Kanno, S. & Nakajima, Y. & Hikida, Y. & Sato, T. (2017)
Sphenodus (Chondrichthyes, Neoselachii) from the Upper Cretaceous in Nakagawa Town, Hokkaido, Japan. Paleontological Research, 21(2), 122–130
DOI: 10.2517/2016PR009

Kanno, S. & Tokumaru, S. & Nakagaki, S. & Nakajima, Y. & Misaki, A. & Hikida, Y. & Sato, T. (2022)
Santonian-Campanian neoselachian faunas of the Upper Cretaceous Yezo Group in Nakagawa Town, Hokkaido, Japan. Cretaceous Research, 133, Article 105139
DOI: 10.1016/j.cretres.2022.105139