The origin of elephant seals: implications of a fragmentary late Pliocene seal (Phocidae: Miroungini) from New Zealand

@article{Boessenecker2016TheOO,
  title={The origin of elephant seals: implications of a fragmentary late Pliocene seal (Phocidae: Miroungini) from New Zealand},
  author={Robert W. Boessenecker and Morgan Churchill},
  journal={New Zealand Journal of Geology and Geophysics},
  year={2016},
  volume={59},
  pages={544 - 550}
}
ABSTRACT Elephant seals (Phocidae: Miroungini) are conspicuous members of modern marine mammal communities but have a meagre fossil record, obscuring the origins of this charismatic clade. We describe the oldest record for the group, CD 35, representing fragments of the maxilla, squamosal, as well as the P2, P3, and possible P1 from the Late Pliocene of the Petane Formation of New Zealand. This fossil possesses several features found only in Miroungini, including simplified triple-cusped teeth… Expand
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References

SHOWING 1-10 OF 40 REFERENCES
Elephant Seal (Mirounga sp.) from The Pleistocene of the Antofagasta Region, Northern Chile
ABSTRACT The genus Mirounga is the largest living member of the Phocidae family (true seals) and includes two species: M. angustirostris and M. leonina. These species exhibit a noticeableExpand
FIRST RECORD OF FOSSIL CYSTOPHORINAE (CARNIVORA, PHOCIDAE): MIDDLE MIOCENE SEALS FROM THE NORTHERN PARATETHYS
TLDR
Findings indicate that the Subfamily Cystophorinae includes not only elephant and hooded seals, but also the two new Middle Sarmatian pachyosteosclerotic seals. Expand
A new durophagous phocid (Mammalia: Carnivora) from the late Neogene of Peru and considerations on monachine seals phylogeny
TLDR
A cladistic analysis including characters from the literature as well as original ones places Hadrokirus among lobodontines in a clade with Piscophoca pacifica, another phocid from the Pisco Formation and supports the monophyly of both Phocinae and Monachinae. Expand
A Reevaluation of Pliophoca etrusca (Pinnipedia, Phocidae) from the Pliocene of Italy: Phylogenetic and Biogeographic Implications
ABSTRACT— The holotype of Pliophoca etrusca, a partial skeleton from the late Pliocene (Piacenzian) of central Italy, is redescribed. Referred material from the Pliocene of Italy, France, and SpainExpand
Review of fossil phocid and otariid seals from the southern and western coasts of South Africa
ABSTRACT Remains of phocid and otariid seals from published and unpublished palaeontological and archaeological occurrences on the South African coast are reviewed. New phocid material supportsExpand
Relationships of the Hooded and Elephant seals (genera Cystophora and Mirounga)
TLDR
Certain characters suggest that Erignathus and Monachus may be the forms linking the typically northern and the typically southern phocids. Expand
Pinniped phylogeny and a new hypothesis for their origin and dispersal.
TLDR
The hypothesis posits that pinnipeds originated on the North American continent with early otarioid and otariid divergences taking place in the northeast Pacific and those of the phocids in coastal areas of southeast N America for later dispersal to colder environments in the N Atlantic and the Arctic Basin, and in Antarctic waters. Expand
Where were the northern elephant seals? Holocene archaeology and biogeography of Mirounga angustirostris
Driven to the brink of extinction during the nineteenth century commercial fur and oil trade, northern elephant seal (NES, Mirounga angustirostris) populations now exceed 100 000 animals in theExpand
Elephant Seals: Mirounga angustirostris and M. leonina
TLDR
The northern elephant seal and the southern elephant seal are the largest pinnipeds, but despite their physical similarities, the two species have very different geographic distributions, with at least 8000 km separating them. Expand
Colonization of the Southern Hemisphere by fur seals and sea lions (Carnivora: Otariidae) revealed by combined evidence phylogenetic and Bayesian biogeographical analysis
TLDR
It is indicated that the distribution of fur seals and sea lions is tightly linked to sea surface temperature and productivity, and suggests that otariids may be vulnerable to future anthropogenic climate change. Expand
...
1
2
3
4
...