Homalonotus

Homalonotus is an extinct genus of trilobites in the order Phacopida. It contains several species, including H. armatus and H. roemeri. It is closely related to other trilobites such as Arduennella and Dipleura..

Homalonotus

Jonathan Chen · CC BY 4.0 · 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
HomalonotinaePBDB
Diet
carnivorePBDB, for Trilobita
Life habit
low-level epifaunalPBDB, for Trilobita
Motility
fast-movingPBDB, for Trilobita
Vision
well-developedPBDB, for Homalonotidae
Environment
marinePBDB, for Trilobita

Time the record covers

At least 75 million years on record.

The record covers at least 458.2 Mya to 382.31 Mya. No occurrence read is dated outside 461.1 Mya to 372.15 Mya.

Ordovician — about 2 of 48 occurrencesOrdovicianSilurian — about 34 of 48 occurrencesSilurianDevonian — about 12 of 48 occurrencesDevonian463–460 Mya — about 0.6 occurrences460–457 Mya — about 0.8 occurrences457–454 Mya — about 0.3 occurrences454–451 Mya — about 0.3 occurrences451–447 Mya — about 0.0 occurrences444–441 Mya — about 0.5 occurrences441–438 Mya — about 2 occurrences438–435 Mya — about 0.9 occurrences435–432 Mya — about 7 occurrences432–429 Mya — about 14 occurrences429–426 Mya — about 6 occurrences426–423 Mya — about 2 occurrences423–420 Mya — about 2 occurrences420–417 Mya — about 2 occurrences417–414 Mya — about 2 occurrences414–410 Mya — about 5 occurrences410–407 Mya — about 0.2 occurrences407–404 Mya — about 0.2 occurrences404–401 Mya — about 0.2 occurrences401–398 Mya — about 0.2 occurrences398–395 Mya — about 0.2 occurrences395–392 Mya — about 0.1 occurrences389–386 Mya — about 0.4 occurrences386–383 Mya — about 0.5 occurrences383–380 Mya — about 0.3 occurrences380–377 Mya — about 0.3 occurrences377–373 Mya — about 0.3 occurrences373–370 Mya — about 0.1 occurrences458.2 Mya382.31 Mya463 Mya370 Mya

48 occurrences of Homalonotus 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

48 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

21 formations

Rochester — 43.18°N, 78.72°WRochester — 43.19°N, 77.56°WRochester — 43.23°N, 77.21°WRochester — 43.22°N, 77.02°WRochester — 43.19°N, 76.91°WRochester — 43.22°N, 76.81°WRochester — 43.26°N, 76.70°WRochester — 43.25°N, 76.64°WRochester — 43.15°N, 75.86°WHerkimer — 43.12°N, 75.60°WHerkimer — 43.06°N, 75.40°WHerkimer — 43.04°N, 75.36°WHerkimer — 43.03°N, 75.28°WJoslin Hill — 43.21°N, 75.46°WBaton River — 40.00°S, 174.00°EWinnica — 50.82°N, 21.33°ERochester Shale — 43.15°N, 77.62°WBeechhill Cove — 45.62°N, 61.97°WGorran Quartzites — 50.49°N, 4.66°WGrès de May — 49.00°N, 1.00°WNoulette — 50.50°N, 2.50°ELandevennec — 48.20°N, 4.08°WIdjerane Sandstone — 25.00°N, 4.17°EFloresta-Labateca — 5.85°N, 72.88°WCatavi — 15.50°S, 68.00°WErere — 2.00°S, 54.00°WBaton — 41.32°S, 172.72°EBrinkmarsh Beds — 51.88°N, 2.23°WReynales — 43.23°N, 77.33°WIrondequoit — 43.24°N, 76.80°WKirkland — 43.03°N, 75.28°WWinnica Mudstone Complex — 50.88°N, 21.11°E

Loading coastlines…

The named rock units Homalonotus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 7 occurrences have no formation on record, which is common for older literature.

Homalonotus and its relatives

Silurian

Where Homalonotus and its relatives were recorded in the Silurian.

Found in the same rock

402 taxa

The Paleobiology Database records 46 sites for Homalonotus, 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

19 references

Each of the 48 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. 7 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 content2

Picture of Homalonotus

Credit
Jonathan Chen
Licence
CC BY 4.0
Commercial use
the licence allows it

3D model

Source
Sketchfab
Licence
CC Attribution-NonCommercial-ShareAlike
Commercial use
the licence does not allow it

Smithsonian Open Access was 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 itHomalonotinae through timeFormations of the SilurianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (König 1825)