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科学家发现5亿年前生物化石 或为螃蟹等生物的祖先

2017-04-27 14:08:42   环球时报

近日,加拿大科学家发现了新的化石物种,揭示了有颚亚门生物群的起源。他们生活在5亿多年前的海洋中,长有钳子,很可能是千足虫、螃蟹和昆虫等生物的祖先。

这种奇怪的节肢动物是首次被发现,并且保存完好,研究人员将其命名为Tokummia katalepsis。节肢动物是一类常见的无脊椎动物,有着分段的肢体和坚硬的外壳。Tokummia是节肢动物的一个子群,长有一对下颚,用来抓取和切割食物。

Tokummia的标本被发现于哥伦比亚Kootenay国家公园大理石峡谷附近的沉积岩,已有5.07亿年历史。专家表示,Tokummia是寒武纪生命大爆发时期最大的掠食者之一,身长超过10厘米,有着宽阔的锯齿状下颌骨和大型前爪,这是现代有颚亚门生物的典型特征。它的钳子很大,像是开瓶器,一只爪子上有牙齿,另一只爪子向里侧弯曲。

Tokummia的身体由50多个细小的部分组成,被一种叫做双壳甲壳的宽大两片式壳状结构所覆盖。此外,它还有下颚,而下颚正是被认为是细分四肢的基础,是有颚亚门生物四肢进化的关键。最重要的是,其分段的身体让人联想到多足类生物,包括蜈蚣,千足虫等。

责任编辑:孙鑫鑫 CN066
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