摘要
以宽川铺生物群中获取的磷酸盐化立体保存的胚胎化石为研究材料,对胚胎化石表面超微结构和内部解剖结构进行观察并对比分析。结果显示,大部分胚胎化石表面被一单层光滑卵膜结构所包裹,卵膜之下胚胎形态多样;刺状结构位于卵膜之下,为原生质胚胎分泌而成的保护层,出现在不同大小和不同类型的胚胎中。结果表明:1)单一依靠胚胎大小或者表面结构不能作为胚胎的分类依据;2)与现生海葵等动物胚胎表面微绒毛相似,Olivooides表面刺状结构可能具有保护胚胎和生态扩散的功能;3)带刺Olivooides很可能发育成为动物演化早期最简单的带刺幼虫形式,是动物间接发育的证据。
Embryos are preserved in 3D as phosphatized permineralizations with superficial structures, and interior anatomy revealed in partly decayed embryos. Different species share a similar naked egg membrane and stellate cuticle which indicatethat. 1） It is improper to judge affinity by size or superficial structure of embryos 2 ） It is postulated that the stellate cuticle would provide physical protection and dispersal to suitable habitat. Such properties were also observed in extant sea anemone embryos 3 ） The stellate Olivooides may grow into a primitive larva, which could be the evidence of indirect development.
出处
《古生物学报》
CSCD
北大核心
2017年第4期449-460,共12页
Acta Palaeontologica Sinica
基金
国家自然科学基金(Nos.:41472015
41202008
41772010
41621003
41720104002)
科技部青年973(No.2013CB837100)
教育部111计划
陕西省自然科学基金(No.2016JQ4026))
中央高校基金(Nos.:310827171013
41202008
2013G3274021
2014G3272013)资助
