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Monophyly or Diphyly in the Origin of Whales
Leigh Van Valen
Vol. 22, No. 1 (Mar., 1968), pp. 37-41
Published by: Society for the Study of Evolution
Stable URL: http://www.jstor.org/stable/2406647
Page Count: 5
You can always find the topics here!Topics: Whales, Bones, Skull, Jaw, Biological adaptation, Fossils, Teeth, Ancestry, Seals, Aquatic organisms
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The recent toothed and whalebone wales differ in many characters, indicating that some adaptations to aquatic life were evolved independently in the two suborders. A review of the known osteological characters and comparisons with archaeocetes show that, for every character, the possibly congeneric Middle Eocene forms Protocetus and Pappocetus could be directly ancestral to both recent suborders. The rapid early evolution of whales was incomplete by the middle Eocene. The toothed genus Aetiocetus is placed in the Mysticeti.
Evolution © 1968 Society for the Study of Evolution