Serrodiscus

Serrodiscus Richter and Richter 1941. is a genus of eodiscinid trilobite belonging to the family Weymouthiidae Kobayashi T. (1943), Order Agnostida. It lived during the late Lower Cambrian, with remains found in Canada, China (Gansu), The United Kingdom (England), Germany (Silesia), Poland, the Russian Federation, and the United States. It is named for the spines on the ventral side of the pygidium, which give it a serrated impression.

Serrodiscus

Hypostome · 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
WeymouthiidaePBDB
Diet
detritivorePBDB, for Agnostida
Life habit
epifaunalPBDB, for Agnostida
Motility
slow-movingPBDB, for Agnostida
Vision
blindPBDB, for Weymouthiidae

Time the record covers

At least 19 million years on record.

The record covers at least 516 Mya to 497 Mya. No occurrence read is dated outside 538.8 Mya to 486.85 Mya.

Cambrian — about 40 of 40 occurrencesCambrianOrdovician — about 0 of 40 occurrences540–538 Mya — about 0.0 occurrences538–536 Mya — about 0.1 occurrences536–534 Mya — about 0.1 occurrences534–533 Mya — about 0.1 occurrences533–531 Mya — about 0.1 occurrences531–529 Mya — about 0.1 occurrences529–527 Mya — about 0.1 occurrences527–525 Mya — about 0.1 occurrences525–524 Mya — about 0.1 occurrences524–522 Mya — about 0.1 occurrences522–520 Mya — about 2 occurrences520–518 Mya — about 4 occurrences518–516 Mya — about 4 occurrences516–515 Mya — about 6 occurrences515–513 Mya — about 8 occurrences513–511 Mya — about 5 occurrences511–509 Mya — about 3 occurrences509–507 Mya — about 2 occurrences507–506 Mya — about 1 occurrence506–504 Mya — about 0.6 occurrences498–497 Mya — about 0.1 occurrences497–495 Mya — about 0.5 occurrences495–493 Mya — about 0.5 occurrences493–491 Mya — about 0.5 occurrences491–489 Mya — about 0.5 occurrences489–488 Mya — about 0.5 occurrences488–486 Mya — about 0.2 occurrences516 Mya497 Mya540 Mya486 Mya

40 occurrences of Serrodiscus 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

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

20 formations

Stissing — 42.41°N, 73.53°WStissing — 43.17°N, 73.32°WUsa — 56.00°N, 88.00°EUsa — 54.00°N, 90.75°EBerikul — 56.00°N, 88.00°ESofiekammen — 76.85°N, 15.95°ESofiekammen — 76.90°N, 15.98°EShashkunar — 52.43°N, 85.02°ESekwi — 63.43°N, 130.35°WSekwi — 63.45°N, 130.35°WSekwi — 63.33°N, 130.48°WBrigus — 45.77°N, 60.29°WBrigus — 47.85°N, 53.94°WWeymouth — 41.95°N, 71.28°WHerrería — 38.60°N, 6.90°WOraparinna Shale — 31.42°S, 138.56°EOraparinna Shale — 31.41°S, 138.53°EHells Mouth Grits — 52.83°N, 4.50°WOcieseki Sandstone — 50.75°N, 20.97°EKamieniec Shale — 50.72°N, 21.37°EShuangyingshan — 41.49°N, 96.72°EBrowns Pond — 43.60°N, 73.32°WAftenstjernesø — 81.57°N, 42.92°WAdams Argillite — 64.95°N, 141.35°WCymbric Vale — 31.22°S, 142.33°EParara — 31.41°S, 138.52°EPurley Shale — 52.53°N, 1.49°W

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The named rock units Serrodiscus 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.

Serrodiscus and its relatives

Cambrian

Where Serrodiscus and its relatives were recorded in the Cambrian.

Found in the same rock

239 taxa

The Paleobiology Database records 32 sites for Serrodiscus, 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

25 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. 13 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 Serrodiscus

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

No 3D scan of Serrodiscus 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 itWeymouthiidae through timeFormations of the CambrianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Richter and Richter 1941)