1. Osaka Museum of Natural History, Osaka, Japan
2. Hokkaido University Museum, Hokkaido, Japan
3. Numata Fossil Museum, Hokkaido, Japan
4. ExxonMobil Corporation, Irving, TX, USA
5. Department of Geology, University of Otago, Dunedin, New Zealand
6. Departments of Paleobiology and Vertebrate Zoology, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA