秘鲁中新世早期的EURHINODELPHINIDS:北大西洋以外首次明确记录到这些超颈海豚

IF 1.6 3区 地球科学 Q2 GEOLOGY Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2021-01-26 DOI:10.13130/2039-4942/15124
O. Lambert, C. Muizon, R. Varas-Malca, M. Urbina, G. Bianucci
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引用次数: 5

摘要

在中新世的许多超长吻海豚(Odontoceti)中,Eurhinodelphinidae家族的成员有两个非常独特的头骨特征:喙部的长而无牙的前颌骨部分和比喙部短得多的下颌骨。到目前为止,该分支的明确归属成员仅记录于北大西洋地区(美国东海岸、北海盆地和地中海)中新世早期至中期的沉积物。在这项工作中,我们描述并比较了东皮斯科盆地(秘鲁南部海岸)Chilcotay组早中新世晚期(Burdigalian,19.25-18Ma)海洋沉积物中长吻海豚的两个部分头骨,保存了喙和下颌材料以及耳骨。基于这些标本,我们首次在整个南半球和整个太平洋报告了该家族的诊断遗骸。欧氏飞燕的古地理分布的这一重大扩展与其拟议的浅水海岸环境形成了鲜明对比;它为该家族成员提供了一条穿越中美洲航道的新疏散路线;它进一步突出了中新世东南太平洋和北大西洋地区的齿类动物之间的相似性。来自富含牙冠的Chilcatay组的欧鼻飞燕标本保存得更好,将有助于与北大西洋家族成员进行更详细的比较。
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EURHINODELPHINIDS FROM THE EARLY MIOCENE OF PERU: FIRST UNAMBIGUOUS RECORDS OF THESE HYPER-LONGIROSTRINE DOLPHINS OUTSIDE THE NORTH ATLANTIC REALM
Among the many hyper-longirostrine dolphins (Odontoceti) from the Miocene, members of the family Eurhinodelphinidae bear two highly distinctive cranial features: a long and edentulous premaxillary portion of the rostrum and a mandible that is significantly shorter than the rostrum. Until now, unambiguously attributed members of this clade were only recorded from early to middle Miocene deposits of the North Atlantic realm (east coast U.S.A., North Sea Basin, and Mediterranean). In this work we describe and compare two partial skulls of longirostrine dolphins from late early Miocene (Burdigalian, 19.25-18 Ma) marine deposits of the Chilcatay Formation, in the East Pisco Basin (southern coast of Peru), preserving rostral and mandibular material, as well as ear bones. Based on these specimens we report diagnostic remains attributable to this family for the first time for the whole Southern Hemisphere and the whole Pacific Ocean. This major expansion of eurhinodelphinids' palaeogeographic distribution contrasts with their proposed shallow-water, coastal environments; it suggests a new dispersal route for members of the family across the Central American Seaway; and it further highlights the similarities between the odontocete faunas of the southeastern Pacific and North Atlantic realm during the Miocene. Better-preserved eurhinodelphinid specimens from the odontocete-rich Chilcatay Formation will allow for a more detailed comparison with North Atlantic members of the family.
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来源期刊
CiteScore
3.60
自引率
4.30%
发文量
28
审稿时长
>12 weeks
期刊介绍: The Rivista Italiana di Paleontologia e Stratigrafia was founded in 1895. It publishes original papers dealing with all fields of paleontology and of stratigraphy, from Italy and the Mediterranean to the Tethys, as well across the globe from China to North America.
期刊最新文献
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