Guiyu oneiros

Name: Guiyu ‭(‬Ghost fish‭)‬.
Phonetic: Gwe-yu.
Named By: M.‭ ‬Zhu,‭ ‬W.‭ ‬Zhao,‭ ‬L.‭ ‬Jia,‭ ‬J.‭ ‬Lu,‭ ‬T.‭ ‬Qiao‭ & ‬Q.‭ ‬Qu‭ ‬-‭ ‬2009.
Classification: Chordata,‭ ‬Osteichthyes,‭ ‬Sarcopterygii.
Species: G.‭ ‬oneiros‭ (‬type‭)‬.
Diet: Uncertain.
Size: Around‭ ‬33‭ ‬centimetres long.
Known locations: China,‭ ‬Yunnan Province‭ ‬-‭ ‬Kuanti Formation.
Time period: Ludlow of the Silurian.
Fossil representation: Well preserved articulated specimen.

       Guiyu is one of if not the earliest known jawed bony fish so far discovered.‭ ‬This has allowed researchers to push back the boundary from where these fish first evolved which has will allow for a more complete evolutionary sequence to be established.

Further reading
- The oldest articulated osteichthyan reveals mosaic gnathostome characters. - Nature 458:469-474. - M. Zhu, W. Zhao, L. Jia, J. Lu, T. Qiao & Q. Qu - 2009.
- Cranial morphology of the Silurian sarcopterygian Guiyu oneiros (Gnathostomata: Osteichthyes). - Science China Earth Sciences vol 53 issue 12. - Tuo Qiao & Min Zhu - 2010.

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