Ontogeny of the articulated yiliangellinine trilobite Zhangshania typica from the lower Cambrian (Series 2, Stage 3) of southern China

Ontogeny of the articulated yiliangellinine trilobite Zhangshania typica from the lower Cambrian (Series 2, Stage 3) of southern China
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中国南方寒武统下寒武统关节式三叶虫张山虫的个体发育(系列2,第3阶段)

DOI:
10.1017/jpa.2016.118
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发表时间:
2016-11
影响因子:
1.4
通讯作者:
Chrysalyn Dominguez
Chrysalyn Dominguez
中科院分区:
地球科学4区
文献类型:
--
作者:
Jin-bo Hou;Nigel C. Hughes;Jie Yang;Tian Lan;Xi-guang Zhang;Chrysalyn Dominguez

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昆明早寒武世伊良水母三叶虫Li和Zhang的新发现保存了从胚后早期(原生动物)到成熟(原生动物)的几乎所有幼虫关节状态,以及在基片上具有成对刺的触角的成熟标本。个体发育系列显示了一些(但可能不是全部)早期Holaspid幼虫的发育,表现为额外的侏儒节段,躯干节段上最长的胸膜棘突的位置逐渐向后迁移,以及Genal棘突的显著异速生长。它还揭示了Parazangshania sicchanensis Li和Zhang,1990是典型钉螺的第3阶段,因此是它的初级异名。红景绍组的这一新发现为南中国地块提供了基于物种的区域对比,而典型Z.可能为传统的Tsanglpuan期的基础提供了一个重要的生物地层标志。
New discoveries of the early Cambrian yiliangellinine trilobite Zhangshania typica Li and Zhang in Kunming preserve almost all instars from early postembryonic (protaspid) to mature (holaspid) phases in articulated state, in addition to mature specimens with antennae bearing paired spines on the basal articles. The ontogenetic series shows protarthrous development with some, but likely not all, early holaspid instars expressing additional pygidial segments, gradual rearward migration of the location of the longest pleural spines on the trunk segments, and striking positive allometry of the genal spines. It also reveals Parazhangshania sichuanensis Li and Zhang, 1990 to be the holaspid stage 3 of Z. typica, and therefore its junior synonym. This new find in the Hongjingshao Formation provides species-based regional correlation across the South China block and Z. typica may provide an important biostratigraphic marker for the base of the traditional Tsanglangpuan Stage.
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