Pinnipeds are marine mammals that evolved from arctoid carnivorans that includes seals, eared seals, and walruses. There are 34 recent species of pinnipeds[1] and 102 species of fossil pinnipeds and their stem-relatives (Pinnipedimorpha).[2] Scientists still debate on which lineage of arctoid carnviroans are the closest relatives to the pinnipedimorphs, being either more closely related to bears or to musteloids.[3][4][5][6][7] Two stem-pinniped families found outside of Pinnipedimorpha, Amphicynodontidae and Semantoridae, were in the past considered to be subfamilies of Ursidae and Mustelidae respectively.[8] In comparison to the two other major groups or marine or sea mammals, cetaceans and sirenians, pinnipeds are a relatively younger group having appeared about 24 to 38 million years ago and are still able to return on land to breed.
The list of fossil taxa is based on mostly the historiographical data from Valenzuela-Toro and Pyenson (2019).[2] The two stem-pinniped arctoid families Amphicynodontidae and Semantoridae are included here as well, although neither family are members of Pinnipedimorpha.[9] The list does not include the recently extinct Caribbean monk seal (Neomonachus tropicalis) and the Japanese sea lion (Zalophus japonicus), as they became extinct within the last two centuries.
Contents
1Phylogeny
2Stem-pinniped arctoids
2.1†Amphicynodontidae Simpson, 1945
2.2†Semantoridae Orlov, 1931
3Stem-pinniped pinnipedimorphs
3.1†Enaliarctidae Mitchell & Tedford, 1973
4Stem-pinniped pinnipediforms
4.1†Pinnarctidion Barnes, 1979
4.2†Pacificotaria Barnes, 1992
4.3†Pteronarctos Barnes, 1989
5Pinnipeds
5.1Phocoidea J. E. Gray, 1821
5.2Otarioidea J. E. Gray, 1821
6See also
7References
Phylogeny
Below is an overall phylogeny of the taxa covered in the article followed after a composite tree in Berta et al. (2018)[8] and a total-evidence (combined molecular-morphological) dataset in Paterson et al. (2020):[9]
†Amphicynodontidae
†Semantoridae
Pinnipedimorpha
†Enaliarctidae
Pinnipediformes
†Pinnarctidion
†Pacificotaria
†Pteronarctos
Pinnipedia
Phocoidea
Phocidae
Otarioidea
†Desmatophocidae
Odobenidae
Panotariidae
†Eotaria
Otariidae
Stem-pinniped arctoids
†Amphicynodontidae Simpson, 1945
Artist's restoration of Kolponomos newportensis.
†Amphicticeps Matthew & Granger, 1924
†Amphicticeps makhchinus Wang et al., 2005
†Amphicticeps dorog Wang et al., 2005
†Amphicticeps shackelfordi Matthew & Granger, 1924
↑Berta, A.; Churchill, M. (2012). "Pinniped taxonomy: review of currently recognized species and subspecies, and evidence used for their description.". Mammal Review42 (3): 207–234. doi:10.1111/j.1365-2907.2011.00193.x.
↑ 2.02.1Valenzuela-Toro, A.; Pyenson, N. D. (2019). "What do we know about the fossil record of pinnipeds? A historiographical investigation.". Royal Society Open Science6 (11): 207–234. doi:10.1098/rsos.191394. PMID 31827869.
↑Lento, G. M.; Hickson, R. E.; Chambers, G. K.; Penny, D. (1995). "Use of spectral analysis to test hypotheses on the origin of pinnipeds". Molecular Biology and Evolution12 (1): 28–52. doi:10.1093/oxfordjournals.molbev.a040189. PMID 7877495. http://mbe.oxfordjournals.org/cgi/reprint/12/1/28.
↑Hunt, R. M. Jr.; Barnes, L. G. (1994). "Basicranial evidence for ursid affinity of the oldest pinnipeds" (PDF). Proceedings of the San Diego Society of Natural History29: 57–67. https://archive.org/details/cbarchive_36692_basicranialevidenceforursidaff1990.
↑Higdon, J. W.; Bininda-Emonds, O. R.; Beck, R. M.; Ferguson, S. H. (2007). "Phylogeny and divergence of the pinnipeds (Carnivora: Mammalia) assessed using a multigene dataset". BMC Evolutionary Biology7: 216. doi:10.1186/1471-2148-7-216. PMID 17996107.
↑Sato, J. J.; Wolsan, M.; Suzuki, H.; Hosoda, T.; Yamaguchi, Y.; Hiyama, K.; Kobayashi, M.; Minami, S. (2006). "Evidence from nuclear DNA sequences sheds light on the phylogenetic relationships of Pinnipedia: Single origin with affinity to Musteloidea". Zoological Science23 (2): 125–46. doi:10.2108/zsj.23.125. PMID 16603806.
↑Flynn, J. J.; Finarelli, J. A.; Zehr, S.; Hsu, J.; Nedbal, M. A. (2005). "Molecular phylogeny of the Carnivora (Mammalia): Assessing the impact of increased sampling on resolving enigmatic relationships". Systematic Biology54 (2): 317–37. doi:10.1080/10635150590923326. PMID 16012099.
↑ 8.08.1Berta, A.; Churchill, M.; Boessenecker, R.W. (2018). "The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses". Annual Review of Earth and Planetary Sciences0. doi:10.1146/annurev-earth-082517-010009.
↑ 9.09.1Paterson, R. S.; Rybczynski, N.; Kohno, N.; Maddin, H. C. (2020). "Pinniped taxonomy: review of currently recognized species and subspecies, and evidence used for their description.". Frontiers in Ecology and Evolution7 (457). doi:10.3389/fevo.2019.00457.