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Lower Cambrian phosphatized Punctatus from southern Shaanxi and their ontogeny sequence

机译：陕南地区下寒武统磷酸马尾藻及其个体发育序列

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摘要

Phosphatized and three-dimensionally preserved embryos and spherical fossils of metazoan recovered from the Kuanchuanpu Member, Dengying Formation in southern Shaanxi, China provide nice developmental sequence for the studies of origination, taxonomy,phylogenic evolution and developmental biology of early animals. Ontogeny of these larva fossils has not been systemically studied mainly due to their poor preservation and limited identification. The Kuanchuanpu Member, predominated by phosphorites andcherts, yields phosphatized animal embryos, particularly those of Olivooides and Punctatus which have high resolution in fine structures and different ontogeny developmental stages. An ontogenetic sequence of the Punctatus is established mainly base onits developmental transitions from body part to oral one, which is perfectly consistent with the embryonic ontogeny sequence proposed by Bengtson and Yue (1997). Furthermore, a new genus Quadrapyrgites gen. nov is erected to receive a larva with tetraradial body plan.
机译：从陕西南部灯影组宽川铺段中发现的磷酸化和三维保存的后生动物的球形化石和球形化石，为早期动物的起源，分类学，系统进化和发育生物学的研究提供了良好的发展顺序。这些幼虫化石的个体发育尚未得到系统的研究，主要是由于它们的保存性差和鉴定有限。 Kuanchuanpu成员以亚磷酸盐和cher草为主，可产生磷酸化的动物胚胎，尤其是油橄榄和马尾藻，它们在精细结构和不同个体发育阶段具有高分辨率。马尾松的个体发育序列主要是根据其从身体部位到口腔的发育转变而建立的，这与Bengtson和Yue（1997）提出的胚胎个体发育序列完全一致。此外，还有一个新的Quadrapyrgites属。 nov竖立以接受具有四radi体计划的幼虫。

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