Cromus

Cromus

via iDigBio · CC0 · via iDigBio. 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
EncrinurinaePBDB
Diet
carnivorePBDB, for Trilobita
Life habit
low-level epifaunalPBDB, for Trilobita
Motility
fast-movingPBDB, for Trilobita
Vision
well-developedPBDB
Environment
marinePBDB, for Trilobita

Time the record covers

At least 26 million years on record.

The record covers at least 449 Mya to 422.7 Mya. No occurrence read is dated outside 452.3 Mya to 419.62 Mya.

Ordovician — about 3 of 31 occurrencesOrdovicianSilurian — about 28 of 31 occurrencesSilurianDevonian — about 0 of 31 occurrences453–452 Mya — about 0.4 occurrences452–451 Mya — about 1 occurrence451–450 Mya — about 1 occurrence450–448 Mya — about 0.5 occurrences444–443 Mya — about 0.3 occurrences443–442 Mya — about 1 occurrence442–440 Mya — about 1 occurrence440–439 Mya — about 1 occurrence439–438 Mya — about 1 occurrence438–437 Mya — about 0.9 occurrences437–436 Mya — about 0.9 occurrences436–435 Mya — about 0.9 occurrences435–434 Mya — about 0.9 occurrences434–433 Mya — about 0.6 occurrences433–431 Mya — about 0.1 occurrences431–430 Mya — about 0.1 occurrences430–429 Mya — about 0.1 occurrences429–428 Mya — about 0.1 occurrences428–427 Mya — about 0.1 occurrences427–426 Mya — about 3 occurrences426–425 Mya — about 4 occurrences425–423 Mya — about 6 occurrences423–422 Mya — about 4 occurrences422–421 Mya — about 0.5 occurrences421–420 Mya — about 0.5 occurrences420–419 Mya — about 0.2 occurrences449 Mya422.7 Mya453 Mya419 Mya

31 occurrences of Cromus on record, most of them in the Silurian. 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

31 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

Kopanina — 50.00°N, 14.35°EKopanina — 49.95°N, 14.22°EKopanina — 50.08°N, 14.47°EKopanina — 49.52°N, 13.50°EKopanina — 49.96°N, 14.10°EWhittaker — 62.38°N, 127.00°WMalongulli — 33.54°S, 148.86°EGazelle — 41.47°N, 122.59°WChaltash — 40.41°N, 66.45°ECape Schuchert — 81.00°N, 65.00°WRoad River — 65.00°N, 136.00°WShoul Limestone — 34.03°N, 6.85°WGunningbland — 33.13°S, 147.92°EArndell Sandstone — 42.65°S, 146.50°EPozary — 49.15°N, 13.57°E

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The named rock units Cromus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Cromus and its relatives

Silurian

Where Cromus and its relatives were recorded in the Silurian.

Found in the same rock

262 taxa

The Paleobiology Database records 29 sites for Cromus, 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

17 references

Each of the 31 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. 5 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 Cromus

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

No 3D scan of Cromus 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.

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

Keep going

What may have been alongside itEncrinurinae through timeFormations of the SilurianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Barrande 1852)