First fossil record of Mustelus aff. punctulatus Risso, 1826: new evidence for a smooth-hound shark population in the Late Miocene North Sea Basin

IF 1.2 4区 地球科学 Q2 GEOLOGY
Jeroen VAN BOECKEL, Stijn Everaert
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引用次数: 1

Abstract

Mustelus is a problematic genus in palaeoichthyology. Due to the scarcity of fossil teeth, relative homogeneity in tooth morphology and the lack of published extant dentitions, the early history of smooth-hound sharks remains poorly understood. Recently, two teeth were collected in the Tortonian Deurne Member (Diest Formation) near Antwerp (Belgium). Surprisingly, a detailed SEM-based comparison with the extant North-Eastern Atlantic species (Mustelus mustelus, Mustelus asterias, Mustelus punctulatus) allowed assigning the fossil teeth to Mustelus aff. punctulatus. Today, this species is largely restricted to the Mediterranean and lies at the very base of the placental Mustelus clade evolution. Until now, this species remained unrecognized in the existing fossil record. By (re)evaluating isolated teeth from other upper Miocene localities in the southern North Sea Basin, the existence of a widely distributed population of Mustelus aff. punctulatus for the late Serravallian and the Tortonian can now be postulated. Thereafter, the species disappeared from the North Sea. Until today, no single record of Mustelus punctulatus is known from the Mediterranean predating the Messinian Salinity Crisis. Therefore, it is hypothesized that the current populations have their origin in southward migration from northern, Atlantic populations, and this probably after the “Zanclean Flooding”.
1826年斑点鲨的第一个化石记录:晚中新世北海盆地中滑头鲨种群的新证据
在古鱼类学上是一个有问题的属。由于牙齿化石的稀缺性,牙齿形态的相对同质性以及缺乏已发表的现存牙齿,对光滑猎犬鲨的早期历史仍然知之甚少。最近,在比利时安特卫普附近的Tortonian Deurne成员(Diest组)中收集了两颗牙齿。令人惊讶的是,与现存的东北大西洋物种(Mustelus Mustelus, asterias Mustelus, punctulatus Mustelus)进行了详细的扫描电镜比较,发现化石牙齿属于Mustelus affa . punctulatus。今天,这个物种主要局限于地中海,处于胎盘鼠枝进化的最基础。直到现在,这个物种在现有的化石记录中仍未被识别。通过(重新)评估北海盆地南部其他上中新世地区的孤立牙齿,现在可以假设在晚塞拉瓦里亚和托尔顿时期存在广泛分布的Mustelus aff. punctulatus种群。此后,该物种从北海消失了。直到今天,在迈西尼亚盐度危机之前,地中海地区还没有发现斑鼠鳝的单一记录。因此,假设现在的种群起源于从北部大西洋种群向南迁移,这可能是在“赞克林洪水”之后。
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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