Development and trunk segmentation of early instars of a ptychopariid trilobite from Cambrian Stage 5 of China.
Development and trunk segmentation of early instars of a ptychopariid trilobite from Cambrian Stage 5 of China.
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中国寒武纪五阶三叶虫早龄发育及躯干分割
DOI：
10.1038/srep06970
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发表时间：
2014-11-10
影响因子：
4.6
通讯作者：
Zhang XG
中科院分区：
文献类型：
--
作者：
Shen C;Clarkson EN;Yang J;Lan T;Hou JB;Zhang XG
贵州中寒武统高台组（第5期）中发现的许多三维保存的外骨骼化石，已被确定为褶壳类三叶虫Gunniasp。它们主要代表一系列的早期龄期，表现出一些微妙的结构和形态变化与他们的躯干分割和早期发展。形态测量和统计分析表明，横联合出现的第三轴环的protopygidium，这比其相应的protocephalon的增长速度更快的大小完全增长。从一个短暂的臀板的“一个接一个”的顺序释放的胸段不完全按照臀轴的发展，其轴环增加的速度相对较快，一个“不成熟的环”总是出现在轴的后端的进展。这些新的数据建立了一个可检验的模型，揭示三叶虫分割，并提供了新的见解的发展，演化和埋藏环境与寒武纪三叶虫。
Many three-dimensionally preserved exoskeletons found from the middle Cambrian (Stage 5) Gaotai Formation in Guizhou, southern China, have been assigned to the ptychopariid trilobiteGunniasp. They represent mainly a series of early instars, exhibiting some delicate structures and morphological variation associated with their trunk segmentation and early development. Morphometric and statistical analyses indicate that the transverse joint appears to occur with the full growth of the third axial ring of the protopygidium, which increases in size much more rapidly than its corresponding protocephalon with growth. The ‘one by one’ sequential release of thoracic segments from a transitory pygidium does not progress exactly in accordance with the development of the pygidial axis, whose axial rings increase at a relatively faster rate and an ‘immature ring’ always appears initially at the rear end of the axis. These new data set up a testable model for revealing trilobite segmentation and provide fresh insights into the development, evolution and taphonomic surroundings associated with the Cambrian trilobites.
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影响因子：
1.5
作者：
SCHMALFUSS, H
通讯作者：
SCHMALFUSS, H
影响因子：
1.4
作者：
Zhang, XG;Pratt, BR
通讯作者：
Pratt, BR
影响因子：
1.5
作者：
ZHANG, XG
通讯作者：
ZHANG, XG
影响因子：
2.6
作者：
Mansson, Kristina;Clarkson, Euan N. K.
通讯作者：
Clarkson, Euan N. K.
影响因子：
2.3
作者：
Park, Tae-Yoon;Choi, Duck K.
通讯作者：
Choi, Duck K.