Idoceras

Idoceras is a genus of perisphictacean ammonite, belonging to the Perisphinctidae subfamily Idoceratinae. The genus is known from the Upper Jurassic, with a widespread distribution. Shells of Idoceras are evolute, with a wide umbilicus; ribbing strong, bifurcate high on flanks. Suture simpler than in the similar Ataxioceras.

Idoceras

Daderot · Public Domain · 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
IdoceratinaePBDB
Diet
carnivorePBDB, for Ammonoidea
Life habit
nektonicPBDB, for Ammonoidea
Motility
fast-movingPBDB, for Ammonoidea
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At least 2.5 million years on record.

The record covers at least 154.8 Mya to 152.21 Mya. No occurrence read is dated outside 165.3 Mya to 143.1 Mya.

Middle Jurassic — about 1 of 52 occurrencesMiddle JurassicLate Jurassic — about 51 of 52 occurrencesLate JurassicEarly Cretaceous — about 0 of 52 occurrences166–165 Mya — about 0.0 occurrences165–164 Mya — about 0.1 occurrences164–163 Mya — about 0.1 occurrences163–163 Mya — about 0.1 occurrences163–162 Mya — about 0.1 occurrences162–161 Mya — about 0.3 occurrences161–160 Mya — about 0.6 occurrences160–160 Mya — about 0.6 occurrences160–159 Mya — about 0.6 occurrences159–158 Mya — about 0.6 occurrences158–157 Mya — about 3 occurrences157–157 Mya — about 3 occurrences157–156 Mya — about 3 occurrences156–155 Mya — about 3 occurrences155–154 Mya — about 7 occurrences154–153 Mya — about 8 occurrences153–153 Mya — about 8 occurrences153–152 Mya — about 5 occurrences152–151 Mya — about 2 occurrences151–150 Mya — about 2 occurrences150–150 Mya — about 2 occurrences150–149 Mya — about 1 occurrence149–148 Mya — about 0.2 occurrences148–147 Mya — about 0.2 occurrences147–146 Mya — about 0.2 occurrences146–146 Mya — about 0.2 occurrences146–145 Mya — about 0.2 occurrences145–144 Mya — about 0.2 occurrences144–143 Mya — about 0.2 occurrences143–143 Mya — about 0.1 occurrences154.8 Mya – 152.21 Mya165.8 Mya142.6 Mya

52 occurrences of Idoceras on record, most of them in the Late Jurassic. 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

52 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

La Caja — 23.63°N, 100.85°WLa Caja — 23.62°N, 100.85°WNaifa — 14.28°N, 48.55°ENaifa — 14.34°N, 48.39°ELa Casita — 25.05°N, 101.06°WLes Calcaires Médians — 35.68°N, 0.92°WYatova — 40.98°N, 0.62°WMalone — 31.23°N, 105.55°WL'Ammonitico Rosso Supérieur — 35.68°N, 0.92°WTaman — 21.23°N, 98.87°WLogtown Ridge — 38.56°N, 120.85°WMariposa — 37.90°N, 120.41°W

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The named rock units Idoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 19 occurrences have no formation on record, which is common for older literature.

Idoceras and its relatives

Late Jurassic

Where Idoceras and its relatives were recorded in the Late Jurassic.

Found in the same rock

206 taxa

The Paleobiology Database records 31 sites for Idoceras, 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

21 references

Each of the 52 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. 9 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 Idoceras

Credit
Daderot
Licence
Public Domain
Commercial use
the licence allows it

No 3D scan of Idoceras 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 itIdoceratinae through timeFormations of the Late JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.