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Monophyly or Diphyly in the Origin of Whales

Leigh Van Valen
Evolution
Vol. 22, No. 1 (Mar., 1968), pp. 37-41
DOI: 10.2307/2406647
Stable URL: http://www.jstor.org/stable/2406647
Page Count: 5
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Monophyly or Diphyly in the Origin of Whales
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Abstract

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.

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