Arthrorhachis tarda

Arthrorhachis tarda

via GBIF · CC0 · 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
ArthrorhachisPBDB
Diet
detritivorePBDB, for Agnostida
Life habit
epifaunalPBDB, for Agnostida
Motility
slow-movingPBDB, for Agnostida
Vision
blindPBDB, for Metagnostidae

Time the record covers

At least 20 million years on record.

The record covers at least 469.1 Mya to 448.8 Mya. No occurrence read is dated outside 471.3 Mya to 445.2 Mya.

Ordovician — about 40 of 40 occurrencesOrdovician472–471 Mya — about 0.3 occurrences471–470 Mya — about 0.8 occurrences470–469 Mya — about 0.8 occurrences469–468 Mya — about 0.0 occurrences458–457 Mya — about 0.2 occurrences457–456 Mya — about 0.2 occurrences456–456 Mya — about 0.2 occurrences456–455 Mya — about 0.2 occurrences455–454 Mya — about 0.2 occurrences454–453 Mya — about 0.2 occurrences453–452 Mya — about 0.7 occurrences452–451 Mya — about 0.7 occurrences451–450 Mya — about 0.7 occurrences450–449 Mya — about 4 occurrences449–448 Mya — about 7 occurrences448–447 Mya — about 7 occurrences447–446 Mya — about 7 occurrences446–446 Mya — about 7 occurrences446–445 Mya — about 3 occurrences469.1 Mya448.8 Mya471.8 Mya444.7 Mya

40 occurrences of Arthrorhachis tarda 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

40 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

14 formations

Jonstorp — 58.23°N, 15.73°EJonstorp — 58.22°N, 13.82°EJonstorp — 58.00°N, 13.00°EJonstorp — 58.61°N, 13.42°EJonstorp — 58.53°N, 14.98°EJonstorp — 60.91°N, 15.02°EJonstorp — 60.07°N, 15.18°EDomusnovas — 40.34°N, 8.69°EDomusnovas — 39.44°N, 8.42°EDomusnovas — 39.33°N, 8.67°EDomusnovas — 39.24°N, 8.49°EJerrestad — 55.71°N, 13.28°EJerrestad — 55.43°N, 13.30°EJerrestad — 55.53°N, 14.27°ETangtou — 32.07°N, 119.26°ETangtou — 32.00°N, 119.00°EJerrestad — 55.06°N, 14.89°EJerrestad — 55.09°N, 15.04°EJerrestad — 55.04°N, 14.84°EUlunda Mudstone — 58.24°N, 13.73°EUlunda Mudstone — 58.00°N, 13.00°EFosses — 50.34°N, 5.08°EKraluv Dvur — 50.00°N, 14.00°ESkogerholmen — 59.90°N, 10.73°ELindegård — 56.00°N, 13.29°EFjäcka Shale — 58.61°N, 13.42°ELunner — 60.32°N, 10.55°ESholeshook — 51.81°N, 4.96°WChedao — 36.08°N, 106.75°E

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The named rock units Arthrorhachis tarda has been recovered from, largest first. Drawn where the rock is now, not where it formed. 3 occurrences have no formation on record, which is common for older literature.

Arthrorhachis tarda and its relatives

Ordovician

Where Arthrorhachis tarda and its relatives were recorded in the Ordovician.

Found in the same rock

156 taxa

The Paleobiology Database records 40 sites for Arthrorhachis tarda, 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

10 references

Each of the 40 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 Arthrorhachis tarda

Source
GBIF
Credit
via GBIF
Licence
CC0
Commercial use
the licence allows it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

This is what the site found, which is not the same as what exists.

Keep going

What may have been alongside itArthrorhachis through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Barrande 1846)