Guiyu oneiros
Guiyu oneiros is one of the earliest articulated bony fish discovered. Fossils of Guiyu have been found in what is now Qujing, Yunnan, China, in late Silurian marine strata, about 425 million years old. Guiyu is part of the Xiaoxiang fauna which is rich in fossils representing a marine ecosystem. Found in the late Ludlow-aged Kuanti Formation, the remains were dated using conodonts as index fossils. The Xiaoxiang fauna also includes galeaspids, placoderms and acanthodians.

Sun Jiao (Interaccoonale) · CC BY 4.0 · via Wikidata/Commons. May be a photograph of a specimen, or an artist’s reconstruction — an interpretation of a skeleton, since colour and soft tissue are almost never preserved.
On record
Recorded, not inferred- Sits inside
- GuiyuPBDB
- Motility
- actively mobilePBDB, for Osteichthyes
Time the record covers
At most 4 million years on record.
The one occurrence read is dated to somewhere between 426.7 Mya and 422.7 Mya, which is a dating window rather than a span.
1 occurrence of Guiyu oneiros on record, most of them in the Silurian. Bar height is expected occurrences, not a count: each fossil is spread across the span it is dated to, so a tall narrow bar means tight dating and a low wide one means loose.
When
1 occurrences- Silurian100%
These are dates about fossils, not the animal: the record can only begin after it arose and end before it died out, so either end may reach further. Shares are expected occurrences: a fossil dated to a span is counted partly in each period it straddles. More on what this infers.
Found in
1 formation
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The named rock units Guiyu oneiros has been recovered from, largest first. Drawn where the rock is now, not where it formed.
Guiyu oneiros and its relatives
SilurianWhere Guiyu oneiros and its relatives were recorded in the Silurian.
Found in the same rock
29 taxa- Acanthopyge1 site
- Anodontopsis1 site
- Atrypa1 site
- Atrypoidea1 site
- Cypricardinia1 site
- Dunyu longiforus1 site
- Favosites1 site
- Goniophora1 site
- Grammysiaoides sp.1 site
- Heyuncunoceras1 site
- Hindeodella equidentata1 site
- Holmophyllum1 site
- Leptodesma (Leiopteria)1 site
- Morinorhynchus1 site
- Mucophyllum1 site
- Nikiforovaena1 site
- Ostracoda1 site
- Panderodus1 site
- Parastriatopora1 site
- Platydiscoceras1 site
- Proetus1 site
- Retziella1 site
- Sichuanoceras1 site
- Sparalepis tingi1 site
The Paleobiology Database records 1 site for Guiyu oneiros, and this reads all of them. The number is how many of those sites it was catalogued from too. The 24 sharing the most are listed.
This is not a list of everything alive at the time. It is only what has come out of the same ground as this animal and been written down.
Entered from
1 referenceEach of the 1 occurrence read was entered from one of these publications, ordered by how many each accounts for. This is not a search for papers mentioning the name. Each entry links to doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.
Media and terms
Media content1

Picture of Guiyu oneiros
- Source
- Wikidata/Commons
- Credit
- Sun Jiao (Interaccoonale)
- Licence
- CC BY 4.0
- Commercial use
- the licence allows it
No 3D scan of Guiyu oneiros was found in Sketchfab.
Smithsonian Open Access and MorphoSource were not reached for this taxon, so this list is what the others held rather than everything there is.
The description on this site
- Licence
- CC BY-SA 4.0
This is what the site found, which is not the same as what exists.
Keep going
What may have been alongside itGuiyu through timeFormations of the SilurianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Zhu et al. 2009