In:
Annual Review of Earth and Planetary Sciences, Annual Reviews, Vol. 46, No. 1 ( 2018-05-30), p. 203-228
Abstract:
The oldest definitive pinniped fossils date from approximately 30.6–23 million years ago (Ma) in the North Pacific. Pinniped monophyly is consistently supported; the group shares a common ancestry with arctoid carnivorans, either ursids or musteloids. Crown pinnipeds comprise the Otariidae (fur seals and sea lions), Odobenidae (walruses), and Phocidae (seals), with paraphyletic “enaliarctines” falling outside the crown group. The position of extinct Desmatophocidae is debated; they are considered to be closely related to both otariids and odobenids or, alternatively, to phocids. Both otariids and odobenids are known from the North Pacific, diverging approximately 19 Ma, with phocids originating in the North Atlantic or Paratethys region 19–14 Ma. Our understanding of pinniped paleobiology has been enriched by studies that incorporate anatomical and behavioral data into a phylogenetic framework. There is now evidence for sexual dimorphism in the earliest pinnipeds, heralding polygynous breeding systems, followed by increased body sizes, diving capabilities, and diverse feeding strategies in later-diverging phocid and otarioid lineages.
Type of Medium:
Online Resource
ISSN:
0084-6597
,
1545-4495
DOI:
10.1146/earth.2018.46.issue-1
DOI:
10.1146/annurev-earth-082517-010009
Language:
English
Publisher:
Annual Reviews
Publication Date:
2018
detail.hit.zdb_id:
124813-3
detail.hit.zdb_id:
2010309-8
SSG:
16,13
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