Guiyu is an extinct genus of bony fish, and is the earliest known one. It lived during the Late Silurian (419 million years ago) in China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

. It has the combination of both actinopterygian

Actinopterygii

The Actinopterygii or ray-finned fishes constitute a class or sub-class of the bony fishes.The ray-finned fishes are so called because they possess lepidotrichia or "fin rays", their fins being webs of skin supported by bony or horny spines , as opposed to the fleshy, lobed fins that characterize...

 and sarcopterygian

Sarcopterygii

The Sarcopterygii or lobe-finned fishes – sometimes considered synonymous with Crossopterygii constitute a clade of the bony fishes, though a strict classification would include the terrestrial vertebrates...

 features, although analysis of the totality of its features place it closer to Sarcopterygii.

Name

Guiyu represents Mandarin 鬼鱼 guǐyú "ghost

Ghosts in Chinese culture

There are many references to ghosts in Chinese culture. Even Confucius said, "Respect ghosts and gods, but keep away from them."The ghosts take many forms depending on the way in which the person died, and are often harmful....

fish." The specific name oneiros is from Greek ὄνειρος "dream."