Temporal range: Late Silurian
|Artist's concept of Guiyu oneiros.|
Zhu et al., 2009
Guiyu is an extinct genus of bony fish, and is the oldest known. It lived during the Late Silurian (419 million years ago) in China and was 33 cm long. It has the combination of both actinopterygian and sarcopterygian features, although analysis of the totality of its features place it closer to Sarcopterygii.
Guiyu represents Mandarin 鬼魚 guǐyú "ghost fish." The specific name oneiros is from Greek ὄνειρος "dream."
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