Machaeridia

Machaeridia is an extinct group of armoured, segmented annelid worms, known from the Early Ordovician to Carboniferous. It consists of three distinct families: the plumulitids, turrilepadids and lepidocoleids.

Machaeridia

British Museum (Natural History).; Withers, Thomas Henry · Public Domain · 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
AphroditiformiaPBDB
Diet
grazerPBDB
Life habit
epifaunalPBDB
Motility
actively mobilePBDB
Vision
limitedPBDB, for Polychaeta

Time the record covers

At least 146 million years on record.

The record covers at least 477.1 Mya to 330.3 Mya. No occurrence read is dated outside 486.85 Mya to 323.4 Mya.

Cambrian — about 0 of 122 occurrencesOrdovician — about 70 of 122 occurrencesOrdovicianSilurian — about 25 of 122 occurrencesSilurianDevonian — about 10 of 122 occurrencesDevonianCarboniferous — about 17 of 122 occurrencesCarboniferous490–484 Mya — about 1 occurrence484–479 Mya — about 4 occurrences479–473 Mya — about 5 occurrences473–467 Mya — about 4 occurrences467–462 Mya — about 2 occurrences462–456 Mya — about 8 occurrences456–450 Mya — about 17 occurrences450–445 Mya — about 26 occurrences445–439 Mya — about 7 occurrences439–433 Mya — about 10 occurrences433–428 Mya — about 7 occurrences428–422 Mya — about 4 occurrences422–416 Mya — about 1 occurrence416–411 Mya — about 1 occurrence411–405 Mya — about 3 occurrences405–399 Mya — about 3 occurrences399–394 Mya — about 0.3 occurrences394–388 Mya — about 1.0 occurrences388–382 Mya — about 0.0 occurrences382–377 Mya — about 0.5 occurrences377–371 Mya — about 0.5 occurrences360–354 Mya — about 0.7 occurrences354–348 Mya — about 0.3 occurrences348–343 Mya — about 4 occurrences343–337 Mya — about 3 occurrences337–331 Mya — about 5 occurrences331–326 Mya — about 3 occurrences326–320 Mya — about 1 occurrence477.1 Mya330.3 Mya490 Mya320 Mya

122 occurrences of Machaeridia 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

122 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

62 formations

Bangor Limestone — 34.52°N, 87.58°WBangor Limestone — 34.59°N, 87.63°WKope — 39.00°N, 84.00°WKope — 39.06°N, 84.44°WBorden — 36.44°N, 88.06°WKráluv Dvur — 50.03°N, 14.31°ETumugol — 37.17°N, 129.02°EJerrestad Shale — 57.78°N, 14.18°EJerrestad Shale — 55.54°N, 14.29°EZahorany — 50.00°N, 14.00°ERedoak Hollow — 34.37°N, 97.34°WWether Law Linn — 55.81°N, 3.37°WUpper Fezouata — 30.42°N, 5.85°WUpper Fezouata — 30.55°N, 5.68°WUpper Fezouata — 30.82°N, 5.82°WFjacka Shale — 58.00°N, 12.00°EHughley Shales — 52.63°N, 2.52°WWaynesville — 39.45°N, 83.83°WWaynesville — 39.33°N, 84.07°WFairview — 39.00°N, 84.00°WEdwardsville — 39.75°N, 86.67°WEdwardsville — 39.00°N, 86.33°WSularp Shale — 55.71°N, 13.32°EVinice — 50.00°N, 14.00°EWenallt — 51.83°N, 3.58°WRochester Shale — 43.20°N, 77.53°WRochester Shale — 43.10°N, 79.06°WSkelgill — 54.38°N, 3.05°WMotol — 50.08°N, 14.47°EMotol — 50.03°N, 14.42°ELandeyran — 43.47°N, 3.08°EWayne — 35.38°N, 88.00°WWayne — 38.08°N, 87.02°WSularp — 55.71°N, 13.32°E

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The named rock units Machaeridia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 38 further formations hold fewer occurrences each and are not listed. 14 occurrences have no formation on record, which is common for older literature.

Machaeridia and its relatives

Ordovician

Where Machaeridia and its relatives were recorded in the Ordovician.

Found in the same rock

1,777 taxa

The Paleobiology Database records 104 sites for Machaeridia, 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

62 references

Each of the 122 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. 50 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 Machaeridia

Credit
British Museum (Natural History).; Withers, Thomas Henry
Licence
Public Domain
Commercial use
the licence allows it

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

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 itAphroditiformia through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.