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They seem to lack an anterior spine as in phocids and in contrast to and lack of a postorbital process. With the addiavailable the following can be is wide posteriorly, the mastoid process is hypertrophied. and there is a depression anterior to the median lacerate foramen for the first loop of the internal carotid. The latter feature is correlated in Allocyon with a deeply excavated lateral margin of the basioccipital for reception of the carotid artery and inferior petrosal sinus, typical of ursids and amphicyonids.
Tabor, R. , and Tedford. R. H. 1977. Relationships of pinnipeds to other carnivores (Mammalia). Systematic Zoology 25 (for 1976):363-374. Thenius. F. 1969. Stammesgeschichte der Siiugethiere (Einschliesslich der Hominiden). Handbuch der Zoologie. Band 8. Teil 2. Vol. 1:1368. Wyss. A. , 1987. The walrus auditory region and pinnipeds. American Museum Novitates 2871. the monophyly of Pinniped Phylogeny Annalisa Berta Department of Biology, San Diego State San Diego. California 92182 University, Andre R.
Hull. J. D. Beaulieu, and W. W. ). 1983. Correlation of Cenozoic stratigraphic units of western Oregon and Washington. Oregon Department of Geology and Mineral Gas Investigations 7. Portland. Oregon. L. G. 1987. Aetiocetus and Chonecetus, primitive Oligocene toothed mysticetes and the origin of baleen whales. Journal of Industries Oil and Bames, Vertebrate Paleontology 7(3) supplement: 10A. 1989. Aetiocetus and Chonecetus (Mammalia: Cetacea); primitive Oligocene toothed mysticetes and the origin of baleen whales.
Contributions in marine mammal paleontology by Berta A. & al