在动物学中,通常把动物个体发育中从受精卵到孵化的这一阶段称为胚胎.现代胚胎学系研究生物胚胎的学科.而化石胚胎学在以往的古生物学研究中尚未被重视,其原因在于除脊椎动物外,无脊椎动物的卵及胚胎个体微小,且无矿化的外壳包封.因此,它们难以保存为化石,更难以为研究者所发现 In zoology, the embryo is usually referred to as the embryo from the fertilized egg to hatching during the development of an individual animal. Modern embryology is a discipline that studies the biological embryo, and fossil embryology has not been taken seriously in the paleontological research in the past. The reason for this is that in addition to vertebrates, invertebrate eggs and embryos are tiny and shell-free, so they are difficult to preserve as fossils and harder for researchers to find