FIGURE 1. Maps showing the locality of TTM-1, Ziphiidae gen. et sp. indet. at Tomamae Town, Hokkaido, Japan.

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FIGURE 2. Fragmentary skull of TTM-1, Ziphiidae gen. et sp. indet. in dorsal view.

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FIGURE 3. 1-6, Left periotic of TTM-1, Ziphiidae gen. et sp. indet., lateral (1), ventral (2), anterior (3), posterior (4), dorsal (5), medial (6).

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FIGURE 4. 1-6, Key features of the left periotic of TTM-1, Ziphiidae gen. et sp. indet., lateral (1), ventral (2), anterior (3), posterior (4), dorsal (5), medial (6).

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FIGURE 5. 1-6, Left tympanic bulla of TTM-1, Ziphiidae gen. et sp. indet. dorsal (1), medial (2), anterior (3), lateral (4), ventral (5), posterior (6).

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FIGURE 6. 1-6, Key features of the left tympanic bulla of TTM-1, Ziphiidae gen. et sp. indet. dorsal (1), medial (2), anterior (3), lateral (4), ventral (5), posterior (6).

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FIGURE 7. 1-34, Teeth of TTM-1, Ziphiidae gen. et sp. indet., anterior or posterior view (1-8 and 10-17), other side of view of each teeth (18-25 and 27-34), apical view of tooth number 2 (8), lateral view of tooth number 2 (26).

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FIGURE 8. 1-3, The vertebrae of TTM-1, Ziphiidae gen. et sp. indet., vertebra number A anteroposterior view (1), vertebra number A dorsoventral view (2), vertebra number B in dorsoventral view (3).

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FIGURE 9. Morphological changes of the periotics among the Ziphiidae. The cladogram is modified from figure 13 of Bianucci et al. (2016).

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