Late Ediacaran trackways produced by bilaterian animals with paired appendages.

Late Ediacaran trackways produced by bilaterian animals with paired appendages.
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DOI:
10.1126/sciadv.aao6691
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发表时间:
2018-06
期刊:
影响因子:
13.6
通讯作者:
Xiao S
Xiao S
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chen Z;Chen X;Zhou C;Yuan X;Xiao S

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埃迪卡拉人的足迹表明,早期双腿动物的进化发生在5.51亿至5.41亿年前。埃迪卡拉纪遗迹化石为早期动物及其行为的演化提供了关键的古生物学证据。然而,到目前为止,这种化石记录仅限于简单的地表痕迹和相对较浅的洞穴。我们报道了长江三峡中国南部地区埃迪卡拉纪石板滩末期(约551年至约5.41亿年前)保存下来的与洞穴有关的可能的轨迹。这些痕迹化石代表了已知的最早的轨道。它们由两排印记组成,这些印记排列成组织不善的系列或重复的组。这些轨迹可能是由具有配对附肢的双边动物产生的,尽管痕迹标记在门级别上的系统发生亲缘关系尚不清楚。有可能轨道和相关的洞穴是由相同的痕迹制造者产生的,这表明包括行走和洞穴在内的复杂行为。总而言之,这些轨道和洞穴标志着一个新时代的到来,其特点是双边动物的地理生物足迹越来越多。
Ediacaran trackways suggest the evolution of early legged bilaterian animals 551 to 541 million years ago. Ediacaran trace fossils provide key paleontological evidence for the evolution of early animals and their behaviors. Thus far, however, this fossil record has been limited to simple surface trails and relatively shallow burrows. We report possible trackways, preserved in association with burrows, from the terminal Ediacaran Shibantan Member (ca. 551 to ca. 541 million years ago) in the Yangtze Gorges area of South China. These trace fossils represent the earliest known trackways. They consist of two rows of imprints arranged in poorly organized series or repeated groups. These trackways may have been produced by bilaterian animals with paired appendages, although the phylum-level phylogenetic affinity of the trace makers remains unknown. It is possible that the trackways and associated burrows were produced by the same trace maker, indicating a complex behavior involving both walking and burrowing. Together, these trackways and burrows mark the arrival of a new era characterized by an increasing geobiological footprint of bilaterian animals.
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