Leurorthoceras

Leurorthoceras is a genus of flattened actinoceratids with a siphuncle narrower than in Actinoceras, segments of which tend to become longer in the mature parts of the phragmocone, the chambered part of the shell. This fossil is known from the Middle Ordovician of North America, Europe, and Siberia.

Leurorthoceras

via iDigBio · 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
ActinoceratidaePBDB
Diet
carnivorePBDB, for Actinocerida
Life habit
nektobenthicPBDB, for Actinocerida
Motility
actively mobilePBDB, for Actinocerida
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At most 29 million years on record.

Every occurrence read is dated to somewhere between 471.3 Mya and 443.1 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Ordovician — about 4 of 4 occurrencesOrdovicianSilurian — about 0 of 4 occurrences472–471 Mya — about 0.0 occurrences471–470 Mya — about 0.1 occurrences470–469 Mya — about 0.1 occurrences469–468 Mya — about 0.1 occurrences468–467 Mya — about 0.1 occurrences467–466 Mya — about 0.1 occurrences466–465 Mya — about 0.1 occurrences465–464 Mya — about 0.1 occurrences464–463 Mya — about 0.1 occurrences463–462 Mya — about 0.1 occurrences462–461 Mya — about 0.1 occurrences461–460 Mya — about 0.1 occurrences460–459 Mya — about 0.1 occurrences459–458 Mya — about 0.1 occurrences458–457 Mya — about 0.1 occurrences457–456 Mya — about 0.1 occurrences456–455 Mya — about 0.1 occurrences455–454 Mya — about 0.1 occurrences454–453 Mya — about 0.2 occurrences453–452 Mya — about 0.3 occurrences452–451 Mya — about 0.3 occurrences451–450 Mya — about 1 occurrence450–449 Mya — about 0.3 occurrences449–448 Mya — about 0.1 occurrences448–447 Mya — about 0.1 occurrences447–446 Mya — about 0.1 occurrences446–445 Mya — about 0.1 occurrences445–444 Mya — about 0.1 occurrences444–444 Mya — about 0.1 occurrences444–443 Mya — about 0.0 occurrences471.9 Mya442.5 Mya

4 occurrences of Leurorthoceras 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

4 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

1 formation

Amadjuak — 63.72°N, 68.97°WAmadjuak — 65.25°N, 73.17°W

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The named rock units Leurorthoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 occurrences have no formation on record, which is common for older literature.

Leurorthoceras and its relatives

Ordovician

Where Leurorthoceras and its relatives were recorded in the Ordovician.

Found in the same rock

133 taxa

The Paleobiology Database records 4 sites for Leurorthoceras, 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

1 reference

Each of the 4 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 doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content1

Picture of Leurorthoceras

Source
iDigBio
Credit
via iDigBio
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

No 3D scan of Leurorthoceras 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 itActinoceratidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Foerste 1921