An early Cambrian Sidneyia (Arthropoda) resolves the century-long debate of its head organization

We report the extraordinarily preserved euarthropod Sidneyia minor sp. nov. from the Cambrian Stage 3 Xiaoshiba Lagerstätte in Yunnan, South China. So far this is the earliest occurrence of the genus. As with other species of Sidneyia , the new taxon shares similar features such as a crescent-shaped...

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Bibliographic Details
Published inScience China. Earth sciences Vol. 66; no. 3; pp. 521 - 527
Main Authors Du, Kunsheng, Bruton, David L., Yang, Jie, Zhang, Xiguang
Format Journal Article
LanguageEnglish
Published Beijing Science China Press 01.03.2023
Springer Nature B.V
Subjects
Abdomen
Appendages
Cambrian
Computed tomography
Digital cameras
Earth and Environmental Science
Earth science
Earth Sciences
Head
New species
Notches
Paleontology
Radiation
Research Paper
Thorax
Phylogenetics
Cambrian Stage 3
Evolution
Cephalic organization
Sidneyia
Euarthropods
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Summary:We report the extraordinarily preserved euarthropod Sidneyia minor sp. nov. from the Cambrian Stage 3 Xiaoshiba Lagerstätte in Yunnan, South China. So far this is the earliest occurrence of the genus. As with other species of Sidneyia , the new taxon shares similar features such as a crescent-shaped head shield with paired lateral notches for stalked eyes, but more significantly and new, is the presence of three pairs of post-antennal appendages beneath the head shield identified by micro-CT methods. We conclude that Sidneyia is a sister group to other members of Vicissicaudata within the diverse radiation of Artiopoda.
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-022-1019-8