Hemirhodon

Hemirhodon is a genus of trilobites that lived in the Cambrian, from the middle Cambrian to the Dresbachian.

Hemirhodon

Hectonichus · 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
DolichometopidaePBDB
Diet
carnivorePBDB, for Corynexochida
Life habit
nektobenthicPBDB, for Corynexochida
Motility
actively mobilePBDB, for Corynexochida
Environment
marinePBDB, for Trilobita

Time the record covers

At most 9.5 million years on record.

Every occurrence read is dated to somewhere between 506.5 Mya and 497 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Cambrian — about 23 of 23 occurrencesCambrian507–506 Mya — about 0.1 occurrences506–506 Mya — about 0.2 occurrences506–506 Mya — about 0.2 occurrences506–505 Mya — about 0.2 occurrences505–505 Mya — about 0.2 occurrences505–505 Mya — about 0.2 occurrences505–504 Mya — about 0.9 occurrences504–504 Mya — about 1 occurrence504–504 Mya — about 1 occurrence504–503 Mya — about 1 occurrence503–503 Mya — about 1 occurrence503–502 Mya — about 1 occurrence502–502 Mya — about 1 occurrence502–502 Mya — about 1 occurrence502–501 Mya — about 1 occurrence501–501 Mya — about 1 occurrence501–501 Mya — about 1 occurrence501–500 Mya — about 1 occurrence500–500 Mya — about 1 occurrence500–500 Mya — about 1 occurrence500–499 Mya — about 1 occurrence499–499 Mya — about 1 occurrence499–499 Mya — about 1 occurrence499–498 Mya — about 1 occurrence498–498 Mya — about 1 occurrence498–498 Mya — about 1 occurrence498–497 Mya — about 1 occurrence497–497 Mya — about 0.6 occurrences507 Mya496.5 Mya

23 occurrences of Hemirhodon 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

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

10 formations

Holm Dal — 82.42°N, 39.75°WDuchesnay — 51.10°N, 115.95°WDuchesnay — 50.63°N, 115.60°WMarjum — 39.40°N, 113.80°WMarjum — 39.27°N, 113.31°WHillard Limestone — 64.97°N, 141.20°WHillard Limestone — 65.00°N, 141.00°WGrosses-Roches — 48.93°N, 67.17°WHatch Hill — 42.31°N, 73.77°WMarjum Limestone — 39.22°N, 113.40°WVermilion — 51.10°N, 115.95°WSkeels Corner Slate — 44.78°N, 73.11°WWheeler Shale — 39.29°N, 113.31°W

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

Hemirhodon and its relatives

Cambrian

Where Hemirhodon and its relatives were recorded in the Cambrian.

Found in the same rock

270 taxa

The Paleobiology Database records 20 sites for Hemirhodon, 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

9 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. 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 Hemirhodon

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

No 3D scan of Hemirhodon 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 itDolichometopidae through timeFormations of the CambrianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Raymond 1937