Eomonorachus

Eomonorachus is a genus of trilobites in the order Phacopida, that existed during the middle Ordovician in what is now the United States. It was described by Delo in 1935, and the type species is Eomonorachus intermedius, which was originally described under the genus Dalmanites by Walcott in 1877. It also contains the species Eomonorachus divaricatus, which was originally assigned to Calliops by Frederickson in 1964, and was later moved to Estoniops by Shaw in 1974, before being reassessed under its current genus by Ludvigsen in 1978. The type locality was the Decorah Formation in Minnesota.

No picture of Eomonorachus was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Eomonorachus, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
EomonorachinaePBDB
Diet
carnivorePBDB, for Phacopina
Life habit
low-level epifaunalPBDB, for Trilobita
Motility
fast-movingPBDB, for Trilobita
Vision
well-developedPBDB, for Pterygometopidae
Environment
marinePBDB, for Trilobita

Time the record covers

At least 2.8 million years on record.

The record covers at least 453.8 Mya to 451 Mya. No occurrence read is dated outside 457.3 Mya to 449.6 Mya.

Ordovician — about 23 of 23 occurrencesOrdovician458–457 Mya — about 0.2 occurrences457–457 Mya — about 0.9 occurrences457–457 Mya — about 0.9 occurrences457–456 Mya — about 0.9 occurrences456–456 Mya — about 0.9 occurrences456–456 Mya — about 0.9 occurrences456–455 Mya — about 0.9 occurrences455–455 Mya — about 0.9 occurrences455–455 Mya — about 0.9 occurrences455–455 Mya — about 0.9 occurrences455–454 Mya — about 0.9 occurrences454–454 Mya — about 0.9 occurrences454–454 Mya — about 0.9 occurrences454–453 Mya — about 0.8 occurrences453–453 Mya — about 0.8 occurrences453–453 Mya — about 0.8 occurrences453–453 Mya — about 0.8 occurrences453–452 Mya — about 0.8 occurrences452–452 Mya — about 0.8 occurrences452–452 Mya — about 0.8 occurrences452–451 Mya — about 0.8 occurrences451–451 Mya — about 0.8 occurrences451–451 Mya — about 0.9 occurrences451–451 Mya — about 1.0 occurrences451–450 Mya — about 1.0 occurrences450–450 Mya — about 1.0 occurrences450–450 Mya — about 1.0 occurrences450–449 Mya — about 0.3 occurrences453.8 Mya451 Mya457.8 Mya449.1 Mya

23 occurrences of Eomonorachus 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

23 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

11 formations

Martinsburg — 37.38°N, 80.86°WGuttenberg — 42.00°N, 90.00°WGuttenberg — 42.00°N, 90.50°WSpechts Ferry — 42.00°N, 90.00°WSpechts Ferry — 42.00°N, 90.50°WScales Shale — 44.98°N, 93.27°WScales Shale — 42.00°N, 90.50°WIon — 42.00°N, 90.50°WCummingsville — 44.50°N, 92.90°WDecorah Shale — 44.98°N, 93.27°WDunleith — 42.00°N, 90.50°WBromide — 34.00°N, 97.00°WAmadjuak — 68.80°N, 81.24°WDecorah — 39.12°N, 90.97°W

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The named rock units Eomonorachus has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Eomonorachus and its relatives

Ordovician

Where Eomonorachus and its relatives were recorded in the Ordovician.

Found in the same rock

231 taxa

The Paleobiology Database records 23 sites for Eomonorachus, 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

8 references

Each of the 23 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. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content0

No picture of Eomonorachus was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Eomonorachus, or no answer at all. This entry cannot say which.

No 3D scan of Eomonorachus 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 itEomonorachinae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Delo 1935