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CNN 国际新闻
📌 标题：Fossils reveal the earliest animal with a head was also the oldest known ‘righty’
📅 发布时间：Updated Jul 9, 2026, 9:09 PM ET
📝 英文原文：
If you happen to be right-handed, you may be able to trace the origins of that trait to a wormlike animal that lived about 550 million years ago and had a tendency to bend to the right.Spriggina floundersi appeared in oceans during theEdiacaran Period(635 million to 542 million years ago) at the dawn of the first forms of animal life.The small creature’s flat, segmented body, known only from fossils found in what’s now South Australia, was a stretched-out oval. It tapered to a tip at one end and had a large, curved structure at the other, making it the earliest known animal with a head.Paleontologists described the first Spriggina fossils in 1958. Since then, scientists have debated whether the animal could move on its own. To answer that question, researchers recently examined more than 100 fossils in the most comprehensive analysis of Spriggina since its discovery.The scientists concluded that not only did Spriggina wriggle across the seafloor, but the abundance of fossil specimens curving left meant that these early animals favored their right sides, a behavioral preference seen in modern animals that are right-handed.No animal quite like Spriggina exists today, but it set the evolutionary stage for directional preference, a trait possessed not only by mosthumansbut also by otherprimates,mice,frogsand insects.“Fossils of early animals, to most people — even to me — they look weird,” said Scott Evans, lead author of the study detailing the findings that published Thursday in the journalScientific Reports. But if you push past that weirdness, “what we see is that a lot of the fundamental characters that we associate with animals today, things like the ability to move and even having this behavioral handedness, are present in these earliest animal communities.”A ‘really surprising’ discoveryIn some of the fossils, the bodies were straight, while others were curved. The fossils were mirrored imprints of the animals’ soft bodies. Most bent left in the rock, indicating
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🇨🇳 中文翻译：
如果你碰巧是右利手，你也许能够将这一特征的起源追溯到一种生活在大约 5.5 亿年前、具有向右弯曲倾向的蠕虫状动物。在埃迪卡拉时期（6.35 亿至 5.42 亿年前），在第一种动物生命形式出现之时，比目鱼就出现在海洋中。这种小生物的扁平、分段的身体，只能从现在南澳大利亚发现的化石中得知。是一个拉长的椭圆形。它的一端逐渐变细，
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本文由自动抓取系统生成，英文原文已自动翻译为中文。 |
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