Trinodus

Trinodus is a very small to small blind trilobite, a well known group of extinct marine arthropods, which lived during the Ordovician, in what are now the Yukon Territories, Virginia, Italy, Czech Republic, Poland, Denmark, Sweden, Svalbard, Ireland, Scotland, Wales, Iran, Kazakhstan and China. It is one of the last of the Agnostida order to survive.

Trinodus

Dwergenpaartje · CC BY-SA 3.0 · via Wikipedia/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
MetagnostidaePBDB
Diet
detritivorePBDB, for Agnostida
Life habit
epifaunalPBDB, for Agnostida
Motility
slow-movingPBDB, for Agnostida
Vision
blindPBDB, for Metagnostidae

Time the record covers

At least 28 million years on record.

The record covers at least 477.1 Mya to 448.8 Mya. No occurrence read is dated outside 486.85 Mya to 443.1 Mya.

Cambrian — about 0 of 126 occurrencesOrdovician — about 126 of 126 occurrencesOrdovicianSilurian — about 0 of 126 occurrences488–486 Mya — about 0.2 occurrences486–485 Mya — about 1 occurrence485–483 Mya — about 1 occurrence483–482 Mya — about 1 occurrence482–480 Mya — about 1 occurrence480–479 Mya — about 1 occurrence479–477 Mya — about 1 occurrence477–476 Mya — about 3 occurrences476–474 Mya — about 4 occurrences474–473 Mya — about 4 occurrences473–471 Mya — about 5 occurrences471–470 Mya — about 8 occurrences470–468 Mya — about 5 occurrences468–466 Mya — about 3 occurrences466–465 Mya — about 3 occurrences465–463 Mya — about 2 occurrences463–462 Mya — about 1 occurrence462–460 Mya — about 4 occurrences460–459 Mya — about 7 occurrences459–457 Mya — about 12 occurrences457–456 Mya — about 9 occurrences456–454 Mya — about 8 occurrences454–453 Mya — about 7 occurrences453–451 Mya — about 10 occurrences451–450 Mya — about 7 occurrences450–448 Mya — about 7 occurrences448–447 Mya — about 5 occurrences447–445 Mya — about 5 occurrences445–444 Mya — about 1 occurrence444–442 Mya — about 0.4 occurrences477.1 Mya448.8 Mya487.7 Mya442.2 Mya

126 occurrences of Trinodus on record, most of them in the Ordovician. 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

126 occurrences

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

58 formations

Antelope Valley — 39.09°N, 116.85°WAntelope Valley — 36.88°N, 116.66°WAntelope Valley — 37.12°N, 116.50°WAntelope Valley — 36.42°N, 116.62°WDawan — 33.00°N, 111.00°EDawan — 32.00°N, 119.00°EDawan — 30.90°N, 111.39°EEdinburg — 37.23°N, 80.36°WEdinburg — 38.00°N, 79.00°WEdinburg — 38.99°N, 78.36°WEdinburg — 38.82°N, 78.55°WEdinburg — 38.56°N, 78.86°WEdinburg — 38.84°N, 78.55°WSanta Rosita — 23.75°S, 65.54°WSanta Rosita — 24.52°S, 65.55°WSanta Rosita — 24.50°S, 65.75°WSanta Rosita — 22.21°S, 64.89°WBaota — 32.00°N, 108.00°EBaota — 30.00°N, 116.00°EBaota — 33.00°N, 106.00°EBaota — 33.00°N, 108.00°ECampile — 53.22°N, 7.93°WCampile — 53.50°N, 7.17°WCampile — 53.42°N, 7.17°WHolen — 57.11°N, 16.89°EHolen — 57.03°N, 16.88°EHolen — 57.29°N, 16.96°EHolen — 56.62°N, 16.56°EJerrestad Shale — 57.78°N, 14.18°EJerrestad Shale — 55.54°N, 14.29°ESegerstad Limestone — 57.00°N, 17.00°ESegerstad Limestone — 58.00°N, 15.00°ESegerstad Limestone — 61.00°N, 15.00°ESolvang — 60.00°N, 11.00°ESolvang — 59.90°N, 10.63°ESolvang — 58.45°N, 8.76°EJianchaogou — 29.00°N, 109.00°EJianchaogou — 32.00°N, 107.00°EJianchaogou — 28.00°N, 109.00°ETangtou — 32.00°N, 118.00°ETangtou — 32.00°N, 119.00°EFjacka Shale — 58.00°N, 12.00°ENakkholmen — 59.90°N, 10.63°ENakkholmen — 59.84°N, 10.54°ESaergan — 40.64°N, 79.50°EFurudal — 58.00°N, 15.00°EFurudal — 60.92°N, 15.09°ESkagen Limestone — 58.00°N, 14.00°ESkagen Limestone — 58.00°N, 12.00°EKraluv Dvur — 50.00°N, 14.00°ENinemile — 37.00°N, 116.00°WNinemile — 37.12°N, 116.50°WKhankhara — 51.07°N, 84.94°EKhankhara — 51.34°N, 83.05°EKarmberg — 42.00°S, 146.00°EDalby — 58.00°N, 14.00°ESularp Shale — 55.71°N, 13.32°EPersnas — 57.00°N, 17.00°E

Loading coastlines…

The named rock units Trinodus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 34 further formations hold fewer occurrences each and are not listed. 16 occurrences have no formation on record, which is common for older literature.

Trinodus and its relatives

Ordovician

Where Trinodus and its relatives were recorded in the Ordovician.

Found in the same rock

1,302 taxa

The Paleobiology Database records 122 sites for Trinodus, 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

59 references

Each of the 126 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. 47 further references are not listed. 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 Trinodus

Credit
Dwergenpaartje
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

No 3D scan of Trinodus was found in MorphoSource and Sketchfab.

Smithsonian Open Access was 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 itMetagnostidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. M'Coy 1846