Cetaceans are thought to have evolved during the Eocene (56-34 mya), the second epoch of the present-extending Cenozoic Era. Molecular and morphological analyses suggest Cetacea …

Apr 16, 2009 · We review raoellid artiodactyls, as well as the earliest families of cetaceans: pakicetids, ambulocetids, remingtonocetids, protocetids, and basilosaurids. We focus on the …

Dec 21, 2024 · Cetaceans evolved from four-legged (quadruped) terrestrial animals, for which limbs played a primary role in movements, into virtually limbless aquatic creatures living in an …

Dec 21, 2024 · Cetacean - Marine Mammals, Evolution, Classification: Cetaceans are distant descendants of a group of poorly defined mammals known as condylarths. The first fossil …

Mar 21, 2012 · How did these terrestrial ancestors morph over millions of years into the whales and dolphins we are so familiar with today? Dr. Mark Uhen answers questions about marine …

By the late Oligocene, the two modern lineages of cetaceans had evolved from archaeocete ancestors. Interestingly, the late Oligocene whale Aetiocetus , from Oregon, has skull and jaw …

The Cetaceans (whales, dolphins and porpoises) are mammalian marine descendants of land mammals. Their terrestrial origins are indicated by: Their need to breathe air from the surface; …

Cetaceans evolved convergently as streamlined swimmers with fish and aquatic reptiles. Molecular and morphological evidence suggests that artiodactyls as traditionally defined are …

When the ancestors of living cetaceans–whales, dolphins and porpoises–first dipped their toes into water, a series of evolutionary changes were sparked that ultimately nestled these …

May 25, 2020 · Extant cetaceans (whales, dolphins, and porpoises) and their extinct ancestors offer some of the strongest and best-known examples of macroevolutionary transition as well …