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Developmental sequence of Cambrian embryo Markuelia

机译：寒武纪胚胎马尔可利亚的发育顺序

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摘要

Based on more exquisitely preserved specimens of Markuelia hunanensis recently recovered from Middle and Upper Cambrian in western Hunan and in the light of Synchrotron radiation X-ray tomo-graphic microscopy, the developmental sequence from cleavage through organogenesis to the pre-hatching of Cambrian embryo Markuelia, especially the developmental sequence during the pre-hatching stage, i.e. from the earliest period when the scalids and tail spines only took shape to the latest period (just about hatching), is established. This developmental sequence provides a pattern of embryonic development during the pre-hatching stage, which has not been established in the living scalidophorans (priapulids, loriciferans and kinorhynchs). Thus, it not only enriches our knowledge on the embryonic development of the extant descendants of Markuelia, but also opens a new window to the evolution and development of the animal.
机译：根据最近从湘西中上寒武统中采集到的保存更精细的湖南Markuelia标本，并根据同步辐射X射线断层扫描显微镜观察，从裂解到器官发生到孵化前的寒武纪胚胎Markuelia的发育序列。尤其是在孵化前阶段，即从刚形成鳞茎和尾棘的最早时期到最近的时期（仅与孵化有关），建立了发育顺序。该发育序列提供了在孵化前阶段的胚胎发育模式，这在活的鳞甲鱼（独生子，loriciferans和kinorhynchs）中尚未建立。因此，它不仅丰富了我们对马库利亚现存后代的胚胎发育的知识，而且为动物的进化和发展打开了新的窗口。

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