Ptychagnostidae

Ptychagnostidae is a family of agnostid trilobites from the 5th Stage to the Paibian Age of the Cambrian. The family includes several important index fossils.

Ptychagnostidae

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
CondylopygoideaPBDB
Diet
detritivorePBDB, for Agnostida
Life habit
epifaunalPBDB, for Agnostida
Motility
slow-movingPBDB, for Agnostida
Vision
blindPBDB

Time the record covers

At least 9.5 million years on record.

The record covers at least 506.5 Mya to 497 Mya. No occurrence read is dated outside 538.8 Mya to 477.1 Mya.

Cambrian — about 744 of 744 occurrencesCambrianOrdovician — about 0 of 744 occurrencesOrdovician540–538 Mya — about 0.0 occurrences538–536 Mya — about 0.0 occurrences536–534 Mya — about 0.0 occurrences534–531 Mya — about 0.0 occurrences531–529 Mya — about 0.0 occurrences529–527 Mya — about 0.0 occurrences527–525 Mya — about 0.0 occurrences525–523 Mya — about 0.0 occurrences523–521 Mya — about 0.0 occurrences521–519 Mya — about 0.0 occurrences519–517 Mya — about 0.0 occurrences517–514 Mya — about 1.0 occurrences514–512 Mya — about 1 occurrence512–510 Mya — about 1 occurrence510–508 Mya — about 4 occurrences508–506 Mya — about 38 occurrences506–504 Mya — about 125 occurrences504–502 Mya — about 189 occurrences502–499 Mya — about 183 occurrences499–497 Mya — about 175 occurrences497–495 Mya — about 22 occurrences495–493 Mya — about 1 occurrence493–491 Mya — about 1 occurrence491–489 Mya — about 1 occurrence489–487 Mya — about 1 occurrence487–484 Mya — about 0.0 occurrences484–482 Mya — about 0.0 occurrences482–480 Mya — about 0.0 occurrences480–478 Mya — about 0.0 occurrences478–476 Mya — about 0.0 occurrences506.5 Mya497 Mya540 Mya476 Mya

744 occurrences of Ptychagnostidae on record, most of them in the Cambrian. 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

744 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

68 formations

Huaqiao — 28.39°N, 109.53°EHuaqiao — 28.72°N, 109.97°EHuaqiao — 29.10°N, 110.92°EAktas — 43.53°N, 69.95°EZhumabai — 43.53°N, 69.95°EInca — 19.50°S, 138.93°EInca — 20.25°S, 138.82°EInca — 20.03°S, 138.78°EInca — 20.21°S, 138.86°EInca — 19.98°S, 138.92°EYangliugang — 28.82°N, 118.60°EYangliugang — 31.37°N, 120.95°EYangliugang — 32.27°N, 118.25°EV-Creek Limestone — 19.52°S, 138.79°EV-Creek Limestone — 19.56°S, 138.81°EV-Creek Limestone — 20.25°S, 138.63°EV-Creek Limestone — 19.67°S, 138.76°EV-Creek Limestone — 19.79°S, 138.65°EV-Creek Limestone — 20.23°S, 138.29°EV-Creek Limestone — 20.19°S, 138.45°EV-Creek Limestone — 19.79°S, 138.92°EV-Creek Limestone — 19.68°S, 138.69°EShallow Bay — 49.83°N, 57.87°WShallow Bay — 49.02°N, 55.52°WShallow Bay — 49.25°N, 65.57°WWheeler — 39.52°N, 113.00°WWheeler — 39.22°N, 113.40°WCurrant Bush — 19.54°S, 138.86°ECurrant Bush — 19.45°S, 138.62°ECurrant Bush — 19.99°S, 138.90°ECurrant Bush — 19.64°S, 138.93°EAlum Shale — 55.72°N, 13.23°EAlum Shale — 55.72°N, 13.98°EAlum Shale — 58.76°N, 15.52°EMarjum — 39.00°N, 113.00°WMarjum — 39.22°N, 113.40°WMarjum — 39.27°N, 113.31°WFjällbränna — 64.23°N, 15.59°EFjällbränna — 64.43°N, 15.54°EHenson Gletscher — 80.25°N, 62.50°WHenson Gletscher — 82.17°N, 40.40°WWheeler Shale — 39.36°N, 111.59°WWheeler Shale — 39.54°N, 112.92°WWheeler Shale — 39.20°N, 113.30°WWheeler Shale — 39.29°N, 113.31°WKurgiakh — 33.17°N, 77.18°EKurgiakh — 33.07°N, 77.25°EBaguamiao — 32.22°N, 108.42°EMenevia — 51.87°N, 5.22°WDevoncourt Limestone — 21.37°S, 139.97°EDevoncourt Limestone — 21.33°S, 140.07°EMariner Group Spurs — 71.38°S, 162.83°EHillard Limestone — 65.00°N, 141.00°WHillard Limestone — 64.95°N, 141.20°WHillard Limestone — 64.97°N, 141.20°WXijiadian — 32.80°N, 111.45°EXijiadian — 32.73°N, 111.17°EBlacksmith — 41.30°N, 111.72°WBlacksmith — 41.43°N, 111.94°WArthur Creek — 21.83°S, 136.50°EArthur Creek — 22.83°S, 137.00°ELower Alum Shale — 55.00°N, 15.00°E

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The named rock units Ptychagnostidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 44 further formations hold fewer occurrences each and are not listed. 8 occurrences have no formation on record, which is common for older literature.

Ptychagnostidae and its relatives

Cambrian

Where Ptychagnostidae and its relatives were recorded in the Cambrian.

Found in the same rock

709 taxa

The Paleobiology Database records 185 sites for Ptychagnostidae, 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

74 references

Each of the 744 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. 62 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 Ptychagnostidae

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

No 3D scan of Ptychagnostidae 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 itCondylopygoidea through timeFormations of the CambrianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Kobayashi 1939