globalchange  > 过去全球变化的重建
DOI: 10.1371/journal.pone.0123909
论文题名:
Evolutionary Patterns among Living and Fossil Kogiid Sperm Whales: Evidence from the Neogene of Central America
作者: Jorge Velez-Juarbe; Aaron R. Wood; Carlos De Gracia; Austin J. W. Hendy
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2015
发表日期: 2015-4-29
卷: 10, 期:4
语种: 英语
英文关键词: Maxilla ; Skull ; Phylogenetic analysis ; Miocene epoch ; Sperm whales ; Mandible ; Teeth ; Fossils
英文摘要: Kogiids are known by two living species, the pygmy and dwarf sperm whale (Kogia breviceps and K. sima). Both are relatively rare, and as their names suggest, they are closely related to the sperm whale, all being characterized by the presence of a spermaceti organ. However, this organ is much reduced in kogiids and may have become functionally different. Here we describe a fossil kogiid from the late Miocene of Panama and we explore the evolutionary history of the group with special attention to this evolutionary reduction. The fossil consists of cranial material from the late Tortonian (~7.5 Ma) Piña facies of the Chagres Formation in Panama. Detailed comparison with other fossil and extant kogiids and the results of a phylogenetic analysis place the Panamanian kogiid, herein named Nanokogia isthmia gen. et sp. nov., as a taxon most closely related to Praekogia cedrosensis from the Messinian (~6 Ma) of Baja California and to Kogia spp. Furthermore our results show that reduction of the spermaceti organ has occurred iteratively in kogiids, once in Thalassocetus antwerpiensis in the early-middle Miocene, and more recently in Kogia spp. Additionally, we estimate the divergence between extant species of Kogia at around the late Pliocene, later than previously predicted by molecular estimates. Finally, comparison of Nanokogia with the coeval Scaphokogia cochlearis from Peru shows that these two species display a greater morphological disparity between them than that observed between the extant members of the group. We hypothesize that this reflects differences in feeding ecologies of the two species, with Nanokogia being more similar to extant Kogia. Nanokogia shows that kogiids have been part of the Neotropical marine mammal communities at least since the late Miocene, and gives us insight into the evolutionary history and origins of one of the rarest groups of living whales.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0123909&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/22097
Appears in Collections:过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响

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作者单位: Department of Mammalogy, Natural History Museum of Los Angeles County, Los Angeles, California, United States of America;John D. Cooper Archaeological and Paleontological Center, Department of Geological Sciences, California State University, Fullerton, California, United States of America;Department of Geological and Atmospheric Sciences, Iowa State University, Ames, Iowa, United States of America;Smithsonian Tropical Research Institute, Balboa-Ancon, Panama;Department of Invertebrate Paleontology, Natural History Museum of Los Angeles County, Los Angeles, California, United States of America

Recommended Citation:
Jorge Velez-Juarbe,Aaron R. Wood,Carlos De Gracia,et al. Evolutionary Patterns among Living and Fossil Kogiid Sperm Whales: Evidence from the Neogene of Central America[J]. PLOS ONE,2015-01-01,10(4)
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