Aetiocetus is a genus of extinct basal mysticete, or baleen whale that lived 33.9 to 23.03 million years ago, in the Oligocene in the North Pacific ocean, around Japan, Mexico, and Oregon, U.S.

Age: 24-28 million years old, Oligocene Epoch. Range: Aetiocetus weltoni has only been recovered from deposits in coastal Oregon, indicating that it formerly inhabited the Eastern North Pacific Ocean. A closely related species (Aetiocetus …

Modern baleen whales possess large racks of keratinous baleen that hang from the palate and serve to filter plankton, crustaceans, and even fish out of seawater. A series of arteries on the palate afford blood to supply the gingival epithelia which produce the baleen.

Aetiocetidae is an extinct family of toothed baleen whales known from the Oligocene and latest Eocene, so far only from rocks deposited in the North Pacific Ocean. [3][4][5] The whales ranged in size from 3 to 8 metres (10 to 26 ft) long.

Jan 1, 2009 · Aetiocetus is the most speciose genus, followed by Chonecetus and Morawanocetus. Overall, aetiocetids were small-bodied cetaceans with skull lengths of about 60–70 cm and an estimated total body length of 2–3 m.

May 25, 2021 · “Aetiocetus weltoni, an evolutionary cousin of today’s baleen whales, had both teeth and baleen simultaneously in adulthood, making for a very crowded mouth.” The paleontologists examined the 25 million year-old skull of Aetiocetus weltoni using the high-resolution computed tomography.

Aetiocetus is a genus of extinct basal mysticete, or baleen whale that lived 33.9 to 23.03 million years ago, in the late Oligocene in the North Pacific ocean, around Japan, Mexico, and Oregon, U.S. It was first described by Douglas Emlong in 1966 and currently contains known four species, A. cotylalveus , A. polydentatus , A. tomitai , and A ...

Jul 30, 2013 · Aetiocetus is an important transitional form as it displays the early origins of the baleen whales,‭ ‬while still retaining teeth that can be identified as incisors,‭ ‬canines and molars like many other mammals.‭ ‬Later descendants would go on to become exclusive filter feeders like many of the modern great whales that swim our ...

Aetiocetus is a genus of extinct basal mysticete, or baleen whale that lived 33.9 to 23.03 million years ago, in the late Oligocene in the North Pacific ocean, around Japan, Mexico, and Oregon, U.S.

CT scans of a 25 million year-old fossil skull show the Aetiocetus weltoni had both teeth and baleen, unlike modern whales. By Padma Nagappan. A strange phenomenon happens with modern blue whales, humpback whales and gray whales: …