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Pacific white-sided dolphin and dusky dolphin (Lagenorhynchus obliquidens and L. obscurus)
Van Waerebeek, K.; Würsig, B. (2002). Pacific white-sided dolphin and dusky dolphin (Lagenorhynchus obliquidens and L. obscurus), in: Perrin, W.F. et al. Encyclopedia of marine mammals. pp. 859-861
In: Perrin, W.F.; Würsig, B.; Thewissen, J.G.M. (2002). Encyclopedia of marine mammals. Academic Press: San Diego. ISBN 0-12-551340-2. XXXVIII, 1414, photos, drawings, maps, tabs., figs pp., more

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  • Van Waerebeek, K., more
  • Würsig, B.

    Because of their morphological similarities, the stocky dusky dolphin Lagenorhynchus obscurus from the Southern Hemisphere and the Pacific white-sided dolphin Lagenorhynchus obliquidens from the northern Pacific Ocean have long been recognized as phylogenetically closely related species despite the absence of a fossil record. Several researchers have gone so far as to suggest that the latter could almost equally well be regarded as a subspecies of the dusky dolphin. A close scrutiny of morphological and life history parameters, however, does not support this premise. Recent cytochrome b sequence analysis is consistent with the "sister-species" hypothesis, and the divergence date is estimated at 1.9-3.0 million years ago (Cipriano, 1997).

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