Lower Cambrian phosphatized Punctatus from southern Shaanxi and their ontogeny sequence  

作　　者：LI Peng HUA Hong ZHANG LuYi ZHANG DongDong JIN XianBao LIU Zhu 

机构地区：[1]Early Life Institute, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069,China

出　　处：《Chinese Science Bulletin》2007年第20期2820-2828,共9页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 40572015 and 40332016);Ministry of Science and Technology of China (Grant No. 2006CB806400);Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT);Program for New Century Excellent Talents in University, and National Basic Science Personnel Training Foundation (Grant No. J0630537)

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 devel- opmental 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 and cherts, 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 on its developmental transitions from body part to oral one, which is perfectly consistent with the embryonic ontogeny sequence pro- posed by Bengtson and Yue (1997). Furthermore, a new genus Quadrapyrgites gen. nov is erected to receive a larva with tetraradial body plan.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 and cherts, 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 on its 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.

关 键 词：陕西南部 寒武纪层 磷酸盐 个体发育 

分 类 号：Q1-0[生物学—普通生物学]