Extinct genus of porpoises
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Archaeophocaena teshioensis is a species of extinct porpoise from the Late Miocene Koetoi Formation of Japan living around 6.4–5.5 million years ago (mya). The holotype specimen comprises a partial skull. The animal, along with "Miophocaena" and "Pterophocaena", seem to represent an intermediary phase between porpoises and dolphins. The genus name derives from Ancient Greek "archaeo", "ancient," and Latin "phocaena", "porpoise"; the species name honors the Teshio District where the holotype was discovered.
References.
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