A new Mississippian tetrapod from Fife, Scotland, and its environmental context

A new Mississippian tetrapod from Fife, Scotland, and its environmental context
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苏格兰法夫郡的一种新的密西西比四足动物及其环境背景

DOI:
10.1002/spp2.1086
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发表时间:
2017
影响因子:
2.3
通讯作者:
Smithson T
Smithson T
中科院分区:
地球科学2区
文献类型:
--
作者:
Smithson T

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密西西比纪的维西安阶段是四足动物迅速多样化的时期,标志着temnospondyls,microsaurs和无肢的aïstopods的最早出现。这个阶段的四足动物非常罕见,全世界只有十几个地点。在这里,我们宣布在苏格兰法夫发现一个新的维西安遗址,属于阿斯比亚时代,并从中描述了一个新的baphetoidSpathicephalus种。这些标本代表了已知最古老的bapphetoid三百万年,但属于分支中最特殊的成员。与典型的巴非特类有着巨大的边缘牙齿和腭尖牙的早期四足动物不同,匙头兽有着非常宽的扁平头部,牙齿由大量的小而均匀的牙齿组成。Spathacephalids可能是最早的四足动物群体之一,使用吸食小型水生猎物。孢粉学和沉积学分析表明,新的化石层沉积在一个大型的,分层的,淡水湖,变得越来越咸。
The Visean stage of the Mississippian was a time of rapid tetrapod diversification which marks the earliest appearance of temnospondyls, microsaurs and the limbless aïstopods. Tetrapod finds from this stage are very rare and only a dozen sites are known worldwide. Here we announce the discovery of a new Visean site in Fife, Scotland, of Asbian age, and from it describe a new species of the baphetoidSpathicephalus. These specimens represent the oldest known baphetoid by three million years, yet belong to the most specialized members of the clade. Unlike typical baphetoids with large marginal teeth and palatal fangs characteristic of early tetrapods, spathicephalids had very broad flattened heads with a dentition consisting of a large number of small, uniform teeth. Spathicephalids were probably one of the earliest tetrapod groups to use suction feeding on small, aquatic prey. Palynological and sedimentological analysis indicates that the new fossil bed was deposited in a large, stratified, freshwater lake that became increasingly saline.
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