论文部分内容阅读
基于最近在湘西中寒武-上寒武统发现的更多的精美保存的Markuelia hunanensis标本,并且借助于同步加速器辐射X射线层析显微技术,建立了寒武纪胚胎Markuelia从卵裂(cleavage)阶段经过器官形成(organogenesis)阶段至预孵化(pre-hatching)阶段的发育序列,特别是预孵化阶段的发育序列,即从吻刺和尾刺刚刚形成的最早时期直至即将孵化(just about hatching)的最后时期的发育序列.这个发育序列提供了一个胚胎预孵化阶段的发育模式,而这一发育模式在现生的Scalidophorans(曳鳃类、兜甲类和动吻类)中尚未建立.因而,它不仅加深了对Markuelia现生后裔胚胎发育的认识,而且为这类动物的演化和发育开拓了一个新的(研究)窗口.
Based on the more elaborately preserved Markuelia hunanensis specimens found in the Middle Cambrian-Upper Cambrian in western Hunan Province and based on synchrotron radiation X-ray tomography microscopy, a Markovian embryonic Markuelia was established from cleavage ) Stages through the developmental sequence from the organogenesis phase to the pre-hatching phase, in particular the developmental sequence of the pre-hatching phase, that is, from the earliest period of formation of the kiss and tail spines to just about hatching ), Which provides a developmental pattern for the preincubation phase of embryos that has not yet been established in the current Scalidophorans (prongs, pods and kisses) and thus , Which not only deepens the understanding of the embryonic development of Markuelia, but also opens up a new window for the evolution and development of these animals.