Takakuwa, Y. & Hirose, K. & Kurosu, H. (2020)
The first occurrence of fossil sharpnose sevengill shark (Heptranchias; Hexanchiformes) from the Eocene Sakasegawa Formation, Amakusa, Kumamoto, Japan. Bulletin of Gunma Museum of Natural History, 24, 25–30

Ando, Y. & Kawano, S. & Nakatani, D. & Ugai, H. & Hirose, K. & Kurosu, H. (2014)
Fossil Elasmobranch Carcharhinus plumbeus (Nardo, 1827) from the Pleistocene Ogushi Formation, Amakusa City, Kumamoto, Japan. Bulletin of Goshoura Cretaceous Museum, 15, 1–4