Shuyu is an extinct genus of early jawless vertebrate from the Early or Middle Silurian period (late Telychian to early Wenlock stages). It is the basalmost known eugaleaspidiform galeaspid and it lived in what is now northwestern Zhejiang Province, Southeast China. It is known from more than 20 headshields and at least 20 of them include three-dimensionally preserved neurocrania. The specimens of Shuyu were collected from the lower part of Maoshan Formation, located in Changxing District. Shuyu zhejianensis was first assigned by Pan, 1986 to a species of Sinogaleaspis. The genus was first named by Zhikun Gai, Philip C. J. Donoghue, Min Zhu, Philippe Janvier and Marco Stampanoni in 2011 and the type species is Shuyu zhejianensis.[1]
| Shuyu Temporal range:
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| Headshield (IVPP V14330.2a), Paleozoological Museum of China | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | †Galeaspida |
| Order: | †Eugaleaspidiformes |
| Genus: | †Shuyu Gai et al., 2011 |
| Species | |
| Synonyms | |
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†Sinogaleaspis zhejianensis Pan, 1986 | |
References
edit- ^ Zhikun Gai; Philip C. J. Donoghue; Min Zhu; Philippe Janvier; Marco Stampanoni (18 August 2011). "Fossil jawless fish from China foreshadows early jawed vertebrate anatomy". Nature. 476 (7360): 324–327. Bibcode:2011Natur.476..324G. doi:10.1038/nature10276. PMID 21850106. S2CID 20526220. Electronic supplementary material
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