Past beaked whale diversity in the North Sea: reappraisal through a new Miocene record and biostratigraphic analyses

IF 1.2 4区 地球科学 Q2 GEOLOGY
Olivier LAMBERT, Mark BOSSELAERS, Stephen LOUWYE
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引用次数: 0

Abstract

Extant beaked whales (family Ziphiidae) are deep diving suction feeders and none of them can be considered as a permanent resident of the shallow southern North Sea. The rich fossil record of ziphiids from Neogene deposits of this area is thus surprising. However, chronostratigraphic intervals of most recorded taxa remain poorly constrained, preventing from assessing the evolution of their local diversity. In this work, we describe a new ziphiid cranium from the Neogene of Antwerp (north of Belgium), which is attributed to Caviziphius aff. C. altirostris. Sediment samples were extracted from 15 fossil ziphiid cranial remains from this area (including the one described herein), referred to eight species. The samples were analysed for their palynological content, leading to improved chronostratigraphic ranges for several species. Seven to eight ziphiid species from the southern North Sea, all from the Messapicetus clade, are proposed to originate from a Serravallian to Tortonian (late Middle to early Late Miocene) interval, and three to six more precisely from the mid- to late Tortonian. Added to the fossil record of other regions, these results point to a Late Miocene radiation of members of the Messapicetus clade, possibly related to the synchronous worldwide decline of several hyper-longirostrine dolphin clades.
北海过去的喙鲸多样性:通过新的中新世记录和生物地层学分析重新评估
现存的喙鲸(喙鲸科)是深潜吸力捕食者,它们都不能被认为是北海南部浅海的永久居民。因此,该地区新近纪沉积物中丰富的ziphiids化石记录令人惊讶。然而,大多数已记录的分类群的年代地层间隔仍然缺乏限制,这阻碍了对其局部多样性演变的评估。本文描述了比利时北部安特卫普新近纪的一种新的拉链类头盖骨,归属于Caviziphius aff. C. altirostris。沉积物样本是从该地区的15个ziphiid颅骨化石遗骸中提取的(包括本文描述的一个),涉及8个物种。对样品的孢粉含量进行了分析,从而改善了几个物种的年代地层范围。在北海南部发现的7 - 8种ziphiid,均来自Messapicetus分支,被认为起源于Serravallian - Tortonian(中晚期至晚中新世早期),3 - 6种更精确地来自Tortonian中晚期。再加上其他地区的化石记录,这些结果指向中新世晚期Messapicetus分支成员的辐射,可能与几个超长颈海豚分支在世界范围内的同步衰退有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geologica Belgica
Geologica Belgica 地学-地质学
CiteScore
4.70
自引率
27.80%
发文量
8
审稿时长
>12 weeks
期刊介绍: Geologica Belgica is a Belgian journal that welcomes papers concerning all aspects of the earth sciences, with a particular emphasis on the regional geology of Belgium, North West Europe and central Africa. Papers not dedicated to the geology of Belgium, North West Europe and central Africa are only accepted when one of the authors is linked to a Belgian University or Institution. Thematic issues are highly appreciated. In this case, guest editors take in charge the selection of the manuscripts and the subject of the papers can be enlarged. The journal is in open access. Submitted manuscripts should be concise, presenting material not previously published. The journal also encourages the publication of papers from Belgian junior authors. Short letters are accepted. Papers written in English are preferred. Each mansucript will be reviewed by at least two reviewers.
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