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A new periotic of Numataphocoena yamashitai from the upper part of the HorokaoshirarikaFormation (lower Pliocene), Numata, Hokkaido, Japan shows younger ontogenetic features in comparison tothe matured holotype (NFL 7). The referred specimen of N. yamashitai is smaller (approximately 90% in size)than the physically and sexually matured holotype periotic. The holotype (NFL 7) and referred specimen (NFL2617) show several differences owing to ontogenetic changes, such as: the holotype (NFL 7) has a more stronglyswollen medial part of the anterior process, blunt anterior keel, rounded anterodorsal angle, deeper and cleareranterior incisure, more rounded pars cochlearis, deeper and narrower hiatus epitympanicus rather than a flatarea, longer posterior process with an extra edge posterolaterally. N. yamashitai differs from other fossil phocoenidsin having a narrower and sharper anterior part of the internal acoustic meatus and a robust anteriorprocess. Haborophocoena toyoshimai similarly has a relatively narrow internal acoustic meatus and a robustanterior process, compared with other fossil phocoenids. Between N. yamashitai and H. toyoshimai, N. yamashitaihas a narrower internal acoustic meatus and a more robust anterior process. These similarities imply a closerelationship between Numataphocoena and Haborophocoena. The new specimen provides diagnostic featuresand insight into ontogenetic variation of N. yamashitai

paleontological research

A New and Ontogenetically Younger Specimen of<i>Numataphocoena yamashitai</i>from the Upper Part of the Horokaoshirarika Formation (Lower Pliocene), Numata, Hokkaido, Japan

A New and Ontogenetically Younger Specimen ofNumataphocoena yamashitaifrom the Upper Part of the Horokaoshirarika Formation (Lower Pliocene), Numata, Hokkaido, Japan