NEW ANOMALOCARIDID APPENDAGES FROM THE BURGESS SHALE, CANADA
NEW ANOMALOCARIDID APPENDAGES FROM THE BURGESS SHALE, CANADA
复制标题
DOI：
10.1111/j.1475-4983.2010.00955.x
复制
发表时间：
2010-07-01
期刊：
影响因子：
2.6
通讯作者：
Budd, Graham E.
中科院分区：
文献类型：
--
作者：
Daley, Allison C.;Budd, Graham E.
对异齿龙类化石的复杂描述历史部分是由于这些化石的碎片性质造成的。额附肢和嘴部比全身组合更容易保存，因此最早的研究这些动物的工作是孤立地研究这些结构。经过几十年的研究，这些脱节的元素被组装在一起，以重建anomalocaridid身体计划，和总共三个Burgess页岩属，Anomalocaris，Laggania和Hurdia，被完整描述。在这里，我们提出了新的正面附属物材料的额外anomalocaridid类群从“中”寒武纪（系列3）在加拿大的伯吉斯页岩地层，显示在这个地方的anomalocaridids的多样性甚至高于以前认为的。材料包括斯氏大盾贝Amplectobelua stephenensis sp. nov.，该属首次在中国以外发现; Caryosyntrips serratus gen. et sp. nov.，其类似于Anomalocaris附肢，但具有更直的轮廓和不同的刺排列;以及可以是Laggania附肢或Hurdia附肢的第三变体的附肢。新的anomalocaridid材料是同时代的与先前描述的分类群Anomalocaris，Laggania，和Hurdia，和额附属物之间的形态差异可能反映了不同的喂养策略。地层最低的地方，斯蒂芬山S7，产量的材料从所有anomalocaridid类群，但组合在年轻的采石场上的化石岭主要由Anomalocaris和Hurdia只。
The complex history of description of the anomalocaridids has partly been caused by the fragmentary nature of these fossils. Frontal appendages and mouth parts are more readily preserved than whole-body assemblages, so the earliest work on these animals examined these structures in isolation. After several decades of research, these disarticulated elements were assembled together to reconstruct the anomalocaridid body plan, and a total of three Burgess Shale genera, Anomalocaris, Laggania and Hurdia, were described in full. Here we present new frontal appendage material of additional anomalocaridid taxa from the 'Middle' Cambrian ( Series 3) Burgess Shale Formation in Canada, showing that the diversity of anomalocaridids in this locality is even higher than previously thought. Material includes Amplectobelua stephenensis sp. nov., the first known occurrence of this genus outside of China; Caryosyntrips serratus gen. et sp. nov., which is similar to the Anomalocaris appendage but has a straighter outline and a different arrangement of spines; and an appendage that may be either the Laggania appendage or a third morph of the Hurdia appendage. The new anomalocaridid material is contemporaneous with the previously described taxa Anomalocaris, Laggania, and Hurdia, and the differences in morphology between the frontal appendages may reflect different feeding strategies. The stratigraphically lowest locality, S7 on Mount Stephen, yields material from all anomalocaridid taxa, but the assemblages in the younger quarries on Fossil Ridge are dominated by Anomalocaris and Hurdia only.