Tartuosteus
Tartuosteus is an extinct genus of jawless fish from the Devonian of Eastern Europe. It is notable for its large size in comparison to other Ostracoderms, reaching a width of 1.5 m (4.9 ft).

Paul · CC BY-NC 4.0 · via GBIF. 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
- PycnosteidaePBDB
- Motility
- actively mobilePBDB, for Chordata
Time the record covers
At least 5.6 million years on record.
The record covers at least 387.95 Mya to 382.31 Mya. No occurrence read is dated outside 393.47 Mya to 379 Mya.
15 occurrences of Tartuosteus on record, most of them in the Devonian. 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
15 occurrences- Devonian100%
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
8 formations
- Aruküla Formation4
- Aruküla Formation3
- Vstrechnaya Formation1
- Vatutin Formation1
- Pärnu Formation1
- Narva Formation1
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The named rock units Tartuosteus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 occurrences have no formation on record, which is common for older literature.
Tartuosteus and its relatives
DevonianWhere Tartuosteus and its relatives were recorded in the Devonian.
Found in the same rock
95 taxa- Glyptolepis8 sites
- Actinolepis tuberculata6 sites
- Byssacanthus dilatatus6 sites
- Cheirolepis6 sites
- Homostius latus6 sites
- Asterolepis estonica5 sites
- Dickosteus4 sites
- Ganosteus artus4 sites
- Gyroptychius pauli4 sites
- Heterosteus ingens4 sites
- Vladimirolepis proia4 sites
- Cephalaspidida3 sites
- Diplacanthus3 sites
- Holonema obrutshevi3 sites
- Onychodus3 sites
- Orvikuina3 sites
- Osteolepididae3 sites
- Pycnosteus palaeformis3 sites
- Schizosteus striatus3 sites
- Thursius estonicus3 sites
- Asterolepis2 sites
- Cheiracanthus2 sites
- Chondrichthyes2 sites
- Dipterus2 sites
The Paleobiology Database records 12 sites for Tartuosteus, 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
5 references- The Middle Devonian fishes of the Baltic States (Estonia, Latvia) and Belarus10
- Upper Silurian and Devonian heterostracan pteraspidomorphs (Vertebrata) from Severnaya Zemlya (Russia): a preliminary report with biogeographical and biostratigraphical implications2
- Phylogenetic relationships of psammosteid heterostracans (Pteraspidiformes), Devonian jawless vertebrates1
- Psammosteiforms (Agnatha, Heterostraci) from the Lower Frasnian of the Mikhailovskii Mine, Kursk Region, Russia1
- Psammosteiformes (Agnatha). A review with descriptions of new material from the Lower Devonian of Poland1
Each of the 15 occurrences 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. Entries link to doi.org where the Paleobiology Database holds an identifier, and to its own record where it does not. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.
Media and terms
Media content1

Picture of Tartuosteus
- Source
- GBIF
- Credit
- Paul
- Licence
- CC BY-NC 4.0
- Commercial use
- the licence does not allow it
No 3D scan of Tartuosteus 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
- Source
- Wikipedia, “Tartuosteus”
- 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 itPycnosteidae through timeFormations of the DevonianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Obruchev 1961