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The circulatory system of Galeaspida (Vertebrata; stem-Gnathostomata) revealed by synchrotron X-ray tomographic microscopy

Research output: Contribution to journalArticle

Original languageEnglish
Number of pages20
Early online date30 Apr 2019
DateAccepted/In press - 23 Apr 2019
DateE-pub ahead of print (current) - 30 Apr 2019


Micro-CT provides a means of nondestructively investigating the internal structure of organisms with high spatial resolution and it has been applied to address a number of palaeontological problems that would be undesirable by destructive means. This approach has been applied successfully to characterize the cranial anatomy of Shuyu, a 428 million-year-old galeaspid (jawless stem-gnathostome) from the Silurian of Changxing, Zhejiang Province, China. Here, we use the synchrotron X-ray tomographic microscopy (SRXTM) to further describe the circulatory system of the head of Shuyu. Our results indicate that the circulatory system of galeaspids exhibits a mosaic of primitive vertebrate and derived gnathostome characters, including a number of derived gnathostome characters that are absent from osteostracans — the group conventionally interpreted as the sister lineage of jawed vertebrates. Our study provides a rich source of information that can be used to infer and reconstruct the early evolutionary history of the vertebrate cardiovascular system.

    Research areas

  • synchrotron, micro-CT, galeaspids, jawless, gnathostomes, circulatory system



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    Embargo ends: 30/04/20

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    Licence: CC BY-NC-ND


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