FIGURE 1. 1, Locality maps, 2, stratigraphic sections of the locality based on previous studies which are mentioned in the text. This figure is modified from Tanaka (2016).

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FIGURE 2. The skull, NFL 2074, referred specimen of Numataphocoena yamashitai in dorsal view. 1, photo, 2, line art.

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FIGURE 3. The skull, NFL 2074, referred specimen of Numataphocoena yamashitai in ventral view. 1, photo, 2, line art.

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FIGURE 4. The skull, NFL 2074, referred specimen of Numataphocoena yamashitai in lateral view. 1, photo, 2, line art.

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FIGURE 5. The skull, NFL 2074, referred specimen of Numataphocoena yamashitai in anterior view. 1, photo, 2, line art.

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FIGURE 6. Life restoration of Numataphocoena yamashitai. Art work by Tatsuya Shinmura (Ashoro Museum of Paleontology).

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FIGURE 7. A cladogram showing relationships of the Phocoenidae. Numbers represent branch lengths.

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FIGURE 8. The maxillary terrace from the posterior dorsal infraorbital foramen on the maxilla. 1 and 2, NFL 7, the type of Numataphocoena yamashitai. 3 and 4, NFL 2074, the referred specimen.

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FIGURE 9. Geochronological distributions and postulated phylogeny of the Phocoenidae.

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