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中科院南京地质古生物研究所周四（28日）指，中国科研人员早前联同英国、瑞典、瑞士学者，在贵州发现一批有6.1亿年历史的胚胎化石，成为至今人类发现最古老的动物胚胎化石。

有关发现更被刊于国际知名期刊《当代生物学》上。

是次发现胚胎化石名为“笼脊球”，化石整体呈球形，每颗直径不足1毫米，且完整保存其多细胞结构。

研究人员发现指，这些笼脊球均在充满营养物质的厚壁囊包中发育，发育过程既类似动物的单细胞近亲，又更为复杂，显示出有规律的细胞迁移、重组等动物胚胎特有的发育机制。

研究所指，是次发现记录了动物由单细胞向多细胞演化的关键一步，为真正有细胞和组织分化的动物出现奠定了生物学基础。