Stephanoceras

Stephanoceras is an extinct genus of Stephanoceratoid ammonite which lived during the Bajocian. It is the type genus of the family Stephanoceratidae.

Stephanoceras

Micktherocktapper · 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
StephanoceratinaePBDB
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 156 million years on record.

The record covers at least 168.6 Mya to 11.63 Mya. No occurrence read is dated outside 201.4 Mya to 5.333 Mya.

Late Triassic — about 0 of 53 occurrencesEarly Jurassic — about 2 of 53 occurrencesEarly JurassicMiddle Jurassic — about 37 of 53 occurrencesLate Jurassic — about 0 of 53 occurrencesLate JurassicEarly Cretaceous — about 0 of 53 occurrencesLate Cretaceous — about 0 of 53 occurrencesPaleocene — about 0 of 53 occurrencesEocene — about 0 of 53 occurrencesOligocene — about 0 of 53 occurrencesMiocene — about 14 of 53 occurrencesMiocenePliocene — about 0 of 53 occurrencesPleistocene — about 0 of 53 occurrences205–199 Mya — about 0.0 occurrences199–192 Mya — about 0.2 occurrences192–185 Mya — about 0.7 occurrences185–178 Mya — about 0.7 occurrences178–171 Mya — about 0.7 occurrences171–165 Mya — about 36 occurrences165–158 Mya — about 0.1 occurrences158–151 Mya — about 0.1 occurrences151–144 Mya — about 0.1 occurrences144–137 Mya — about 0.0 occurrences22–15 Mya — about 5 occurrences15–8.2 Mya — about 8 occurrences8.2–1.4 Mya — about 1 occurrence168.6 Mya11.63 Mya205 Mya1 Mya

53 occurrences of Stephanoceras on record, most of them in the Middle 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

53 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

18 formations

Taberna — 16.78°N, 96.95°WDhruma — 23.20°N, 46.33°EDhruma — 24.75°N, 45.83°EDhruma — 25.38°N, 45.35°EDhruma — 24.66°N, 46.05°EShanwang — 36.52°N, 118.54°EShanwang — 32.14°N, 118.70°ETwin Creek Limestone — 42.86°N, 111.18°WTwin Creek Limestone — 41.92°N, 111.25°WXianshuihe — 43.65°N, 112.66°EGuemgouma — 35.10°N, 9.71°EAsiento — 26.49°S, 69.31°WSnowshoe — 44.13°N, 118.98°WSmithers — 56.73°N, 127.35°WHalamagai — 46.97°N, 87.47°ELengshuigou — 34.33°N, 109.27°EXiacaowan — 33.45°N, 118.20°ENa Khaem — 18.28°N, 99.65°EBent Saidane — 36.35°N, 10.07°ELautaro — 27.91°S, 69.92°WAsientos — 25.97°S, 69.18°WMontandón — 25.97°S, 69.18°WDjangura — 43.90°N, 41.45°E

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The named rock units Stephanoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 21 occurrences have no formation on record, which is common for older literature.

Stephanoceras and its relatives

Middle Jurassic

Where Stephanoceras and its relatives were recorded in the Middle Jurassic.

Found in the same rock

327 taxa

The Paleobiology Database records 40 sites for Stephanoceras, 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

30 references

Each of the 53 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. 18 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 content3

Picture of Stephanoceras

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

Structured light scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Stephanoceras triacuminatus · AMNH:FM:26775

3D model

Source
Sketchfab
Credit
Steinkern
Licence
CC Attribution-NonCommercial
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 itStephanoceratinae through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Waagen 1869)