NIGPAS OpenIR  > 中国科学院南京地质古生物研究所
Appendages of an early Cambrian metadoxidid trilobite from Yunnan, SW China support mandibulate affinities of trilobites and artiopods
Han Zeng (曾晗); Fangchen Zhao (赵方臣); Zongjun Yin (殷宗军); Maoyan Zhu (朱茂炎)
2017
Source PublicationGeological Magazine
ISSN0016-7568
Volume154Issue:6Pages:1306-1328
AbstractAppendage anatomy contributes crucial data for understanding the evolution and ecology of Euarthropoda. The Palaeozoic trilobites show a great diversity of exoskeletons in the fossil record. However, soft parts, especially appendages, have only been discovered from a few trilobite species. Here we report extraordinarily preserved appendages in the trilobite species Hongshiyanaspis yiliangensis Zhang & Lin in Zhang et al. 1980 (Redlichiida, Metadoxididae) from a single mudstone layer of the Xiazhuang fossil assemblage within the Hongjingshao Formation (Cambrian Series 2, Stage 3) near Kunming, Yunnan, SW China. The appendages exhibit the common architecture revealed by other trilobites and artiopods by consisting of a pair of uniramous antennae followed by a series of paired homonomous biramous limbs. The antennae in holaspid individuals comprise up to 27 spinous podomeres and their ontogeny occurs by lengthening of the podomeres. The post-antennal biramous limbs are similar to those in other polymerid trilobites and artiopods by having a single-segmented protopodite and an endopodite comprising seven segments, but possess a unique wide tripartite exopodite with long setae. Sophisticated appendage anatomy, including the body-limb junction, fine setae, putative muscle bundles and duct-type tissues, are also revealed. Appendages of trilobites, artiopods and other upper stem-group euarthropods are compared and summarized. The H. yiliangensis appendages highlight the high morphological disparity of exopodites and the conservativeness of endopodites in trilobites and artiopods. This morphological pattern, together with similar body patterning seen in crustaceans but not in chelicerates, supports the mandibulate affinities of trilobites and at least some artiopods.
Keywordarthropods trilobites appendages Mandibulata Cambrian soft-part preservation
DOI10.1017/S0016756817000279
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000413978800011
PublisherCAMBRIDGE UNIV PRESS
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/14073
Collection中国科学院南京地质古生物研究所
中国科学院南京地质古生物研究所
其他
Corresponding AuthorFangchen Zhao (赵方臣)
Recommended Citation
GB/T 7714
Han Zeng ,Fangchen Zhao ,Zongjun Yin ,et al. Appendages of an early Cambrian metadoxidid trilobite from Yunnan, SW China support mandibulate affinities of trilobites and artiopods[J]. Geological Magazine,2017,154(6):1306-1328.
APA Han Zeng ,Fangchen Zhao ,Zongjun Yin ,&Maoyan Zhu .(2017).Appendages of an early Cambrian metadoxidid trilobite from Yunnan, SW China support mandibulate affinities of trilobites and artiopods.Geological Magazine,154(6),1306-1328.
MLA Han Zeng ,et al."Appendages of an early Cambrian metadoxidid trilobite from Yunnan, SW China support mandibulate affinities of trilobites and artiopods".Geological Magazine 154.6(2017):1306-1328.
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