Trochonema

Trochonema is an extinct genus of early marine snail from the Paleozoic, which lasted almost 215 million years. It was first described by John William Salter in 1859. Like many genera in the order Murchisoniina, the relationship between it and other large gastropod clades is uncertain.

Trochonema

RealGatba · CC BY-SA 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
TrochonematidaePBDB
Diet
detritivorePBDB, for Murchisoniina
Life habit
epifaunalPBDB, for Murchisoniina
Motility
slow-movingPBDB, for Murchisoniina
Vision
limitedPBDB, for Murchisoniina
Environment
coastal,marinePBDB, for Murchisoniina

Time the record covers

At least 206 million years on record.

The record covers at least 470.3 Mya to 264.28 Mya. No occurrence read is dated outside 471.3 Mya to 259.857 Mya.

Ordovician — about 223 of 240 occurrencesOrdovicianSilurian — about 14 of 240 occurrencesSilurianDevonian — about 2 of 240 occurrencesDevonianCarboniferous — about 0 of 240 occurrencesPermian — about 1 of 240 occurrencesPermian476–468 Mya — about 3 occurrences468–461 Mya — about 6 occurrences461–454 Mya — about 80 occurrences454–446 Mya — about 119 occurrences446–439 Mya — about 21 occurrences439–432 Mya — about 4 occurrences432–424 Mya — about 5 occurrences424–417 Mya — about 0.6 occurrences395–388 Mya — about 0.5 occurrences388–380 Mya — about 0.7 occurrences380–373 Mya — about 0.7 occurrences373–366 Mya — about 0.1 occurrences270–263 Mya — about 0.3 occurrences263–256 Mya — about 0.7 occurrences470.3 Mya264.28 Mya476 Mya256 Mya

240 occurrences of Trochonema 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

240 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

75 formations

Dunleith — 42.02°N, 93.45°WDunleith — 42.00°N, 90.50°WBad Cache Rapids — 66.92°N, 84.00°WBad Cache Rapids — 66.92°N, 83.92°WBad Cache Rapids — 66.78°N, 83.90°WBad Cache Rapids — 68.71°N, 81.94°WBad Cache Rapids — 69.00°N, 81.67°WBad Cache Rapids — 69.23°N, 82.48°WBad Cache Rapids — 68.34°N, 82.37°WBad Cache Rapids — 68.38°N, 82.31°WBad Cache Rapids — 69.23°N, 82.25°WGlenwood — 46.00°N, 94.00°WGlenwood — 42.00°N, 90.50°WCliffield — 37.15°N, 81.49°WCliffield — 37.13°N, 81.41°WCliffield — 37.08°N, 81.33°WCliffield — 37.17°N, 81.48°WCliffield — 37.08°N, 81.71°WPlatteville — 46.00°N, 94.00°WPlatteville — 43.30°N, 91.78°WPlatteville — 42.51°N, 89.03°WVerulam — 44.45°N, 78.70°WVerulam — 44.43°N, 78.78°WVerulam — 44.48°N, 78.95°WWitten Limestone — 37.11°N, 81.52°WWitten Limestone — 37.00°N, 81.00°WWitten Limestone — 37.02°N, 81.63°WWitten Limestone — 37.03°N, 81.79°WWitten Limestone — 37.10°N, 81.62°WCummingsville — 44.50°N, 92.90°WCummingsville — 46.00°N, 94.00°WSt. Peter Sandstone — 46.00°N, 94.00°WPecatonica — 42.00°N, 90.50°WMifflin — 42.00°N, 90.50°WWise Lake — 42.00°N, 90.50°WMcGregor — 42.73°N, 90.48°WMcGregor — 42.51°N, 89.03°WMcGregor — 42.00°N, 89.39°WMcGregor — 40.78°N, 87.39°WPortage Chute — 58.00°N, 95.00°WPortage Chute — 56.50°N, 94.25°WPortage Chute — 58.50°N, 95.00°WChasm Creek — 58.17°N, 94.67°WChasm Creek — 58.13°N, 94.77°WChasm Creek — 58.25°N, 94.57°WProsser Limestone — 46.00°N, 94.00°WStewartville — 46.00°N, 94.00°WIon — 42.00°N, 90.50°WAmadjuak — 63.72°N, 68.97°WAmadjuak — 65.25°N, 73.17°WAmadjuak — 68.80°N, 81.24°WAmadjuak — 63.75°N, 68.95°WPort Clarence Limestone — 65.50°N, 165.92°WPort Clarence Limestone — 65.49°N, 166.94°WFarr — 47.42°N, 79.60°WFarr — 47.45°N, 79.67°WQuimbys Mill — 41.85°N, 89.48°WQuimbys Mill — 44.98°N, 93.27°WBobcaygeon — 44.67°N, 78.80°WBobcaygeon — 44.53°N, 78.55°WBobcaygeon — 45.54°N, 75.29°WAkpatok — 65.25°N, 73.17°WAkpatok — 60.34°N, 67.97°W

Loading coastlines…

The named rock units Trochonema has been recovered from, largest first. Drawn where the rock is now, not where it formed. 51 further formations hold fewer occurrences each and are not listed. 17 occurrences have no formation on record, which is common for older literature.

Trochonema and its relatives

Ordovician

Where Trochonema and its relatives were recorded in the Ordovician.

Found in the same rock

1,749 taxa

The Paleobiology Database records 165 sites for Trochonema, 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

65 references

Each of the 240 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. 53 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 Trochonema

Credit
RealGatba
Licence
CC BY-SA 4.0
Commercial use
the licence allows it

No 3D scan of Trochonema was found in MorphoSource and Sketchfab.

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 itTrochonematidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Salter 1859