Liroceras

Liroceras is a genus of nautiloid cephalopod. It is the type genus of the clydonautiliacean family, Liroceratidae, and is characterized by a rapidly expanding, subglobular, nautiliconic shell with a reniform whorl section, small umbilicus, essentially straight sutures, and a siphuncle with a variable but not marginal position.

Liroceras

via iDigBio · CC BY-NC-SA · 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
LiroceratidaePBDB
Diet
carnivorePBDB, for Nautilida
Life habit
nektobenthicPBDB, for Nautilida
Motility
actively mobilePBDB, for Nautilida
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At least 85 million years on record.

The record covers at least 339.9 Mya to 254.14 Mya. No occurrence read is dated outside 346.7 Mya to 251.902 Mya.

Carboniferous — about 65 of 115 occurrencesCarboniferousPermian — about 50 of 115 occurrencesPermianEarly Triassic — about 0 of 115 occurrences349–345 Mya — about 0.4 occurrences345–342 Mya — about 1.0 occurrences342–339 Mya — about 1 occurrence339–335 Mya — about 3 occurrences335–332 Mya — about 8 occurrences332–329 Mya — about 7 occurrences329–326 Mya — about 4 occurrences326–322 Mya — about 4 occurrences322–319 Mya — about 6 occurrences319–316 Mya — about 2 occurrences316–312 Mya — about 0.8 occurrences312–309 Mya — about 4 occurrences309–306 Mya — about 3 occurrences306–303 Mya — about 9 occurrences303–299 Mya — about 11 occurrences299–296 Mya — about 2 occurrences296–293 Mya — about 2 occurrences293–289 Mya — about 4 occurrences289–286 Mya — about 2 occurrences286–283 Mya — about 2 occurrences283–280 Mya — about 3 occurrences280–276 Mya — about 3 occurrences276–273 Mya — about 2 occurrences273–270 Mya — about 0.9 occurrences270–266 Mya — about 1 occurrence266–263 Mya — about 2 occurrences260–257 Mya — about 7 occurrences257–253 Mya — about 10 occurrences253–250 Mya — about 8 occurrences339.9 Mya254.14 Mya349 Mya250 Mya

115 occurrences of Liroceras on record, most of them in the Carboniferous. 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

115 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

41 formations

Graham — 33.26°N, 98.12°WGraham — 33.18°N, 98.12°WGraham — 33.22°N, 98.19°WGraham — 33.15°N, 98.16°WBellerophon — 46.58°N, 11.70°EJulfa — 38.94°N, 45.51°EJulfa — 39.01°N, 45.43°EJulfa — 38.73°N, 45.58°EChangxing — 25.72°N, 112.82°EChangxing — 31.08°N, 119.71°EChangxing — 26.14°N, 105.28°EHale — 36.09°N, 94.14°WHale — 36.05°N, 94.23°WHale — 36.17°N, 93.23°WWolf Mountain — 33.22°N, 97.82°WLower Sakamena — 13.55°S, 48.84°ELower Sakamena — 13.45°S, 48.97°EAdmiral — 31.76°N, 99.47°WAdmiral — 33.59°N, 98.96°WUnion Valley — 34.71°N, 96.58°WUnion Valley — 34.69°N, 96.54°WJungle Creek — 65.87°N, 136.18°WAli Bashi — 38.94°N, 45.52°EVanport — 40.89°N, 80.34°WVanport — 40.99°N, 80.33°WDalong — 26.51°N, 106.87°EPark City — 43.54°N, 108.70°WPark City — 43.19°N, 109.16°WColsterdale Marine Beds — 54.07°N, 1.82°WHueco — 32.37°N, 106.88°WWatahomigi — 36.16°N, 113.80°WBloyd Shale — 35.79°N, 94.24°WMattoon — 39.18°N, 88.60°WAlvy Creek — 36.80°N, 84.55°WPalo Quemado — 26.39°N, 102.94°WCabaniss — 37.49°N, 94.57°WBoggy — 34.43°N, 96.96°WCasper — 41.21°N, 105.53°W

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The named rock units Liroceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 17 further formations hold fewer occurrences each and are not listed. 34 occurrences have no formation on record, which is common for older literature.

Liroceras and its relatives

Carboniferous

Where Liroceras and its relatives were recorded in the Carboniferous.

Found in the same rock

1,058 taxa

The Paleobiology Database records 103 sites for Liroceras, 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

53 references

Each of the 115 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. 41 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 Liroceras

Source
iDigBio
Credit
via iDigBio
Licence
CC BY-NC-SA
Commercial use
the licence does not allow it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

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 itLiroceratidae through timeFormations of the CarboniferousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Teichert 1940