Stephanoceratidae

Stephanoceratidae is a family of planulate and coronate ammonites within the Stephanoceratoidea. Shells are evolute so that all whorls are exposed and have strong ribbing that bifurcates, that is splits in two, on the flanks. Many have tubercles at the point of bifurcation. Whorl sections are generally subequant; the outer rim, or venter, commonly rounded.

Stephanoceratidae

Uncredited · 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
StephanoceratoideaPBDB
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 2.7 million years on record.

The record covers at least 170.9 Mya to 168.2 Mya. No occurrence read is dated outside 201.4 Mya to 143.1 Mya.

Late Triassic — about 0 of 616 occurrencesEarly Jurassic — about 2 of 616 occurrencesEarly JurassicMiddle Jurassic — about 614 of 616 occurrencesMiddle JurassicLate Jurassic — about 0 of 616 occurrencesLate JurassicEarly Cretaceous — about 0 of 616 occurrences203–201 Mya — about 0.0 occurrences201–199 Mya — about 0.0 occurrences199–197 Mya — about 0.0 occurrences197–194 Mya — about 0.0 occurrences194–192 Mya — about 0.1 occurrences192–190 Mya — about 0.2 occurrences190–188 Mya — about 0.2 occurrences188–186 Mya — about 0.2 occurrences186–184 Mya — about 0.2 occurrences184–182 Mya — about 0.2 occurrences182–180 Mya — about 0.2 occurrences180–178 Mya — about 0.2 occurrences178–176 Mya — about 0.2 occurrences176–174 Mya — about 1 occurrence174–172 Mya — about 6 occurrences172–170 Mya — about 96 occurrences170–168 Mya — about 432 occurrences168–166 Mya — about 55 occurrences166–164 Mya — about 23 occurrences164–162 Mya — about 0.7 occurrences162–160 Mya — about 0.2 occurrences160–158 Mya — about 0.0 occurrences158–156 Mya — about 0.0 occurrences156–154 Mya — about 0.0 occurrences154–152 Mya — about 0.0 occurrences152–150 Mya — about 0.0 occurrences150–148 Mya — about 0.0 occurrences148–146 Mya — about 0.0 occurrences146–144 Mya — about 0.0 occurrences144–142 Mya — about 0.0 occurrences170.9 Mya – 168.2 Mya203 Mya142 Mya

616 occurrences of Stephanoceratidae 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

616 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

49 formations

Dhruma — 24.23°N, 46.58°EDhruma — 23.97°N, 45.17°EDhruma — 23.80°N, 46.17°EDhruma — 23.67°N, 46.17°EDhruma — 23.30°N, 46.33°EDhruma — 23.20°N, 46.33°EDhruma — 23.08°N, 46.33°EDhruma — 22.62°N, 46.00°EDhruma — 22.53°N, 46.17°EDhruma — 22.45°N, 46.00°EDhruma — 22.03°N, 46.00°EDhruma — 24.75°N, 45.83°EDhruma — 25.33°N, 45.50°EDhruma — 25.50°N, 45.00°EDhruma — 24.08°N, 45.50°EDhruma — 23.92°N, 46.03°EDhruma — 23.08°N, 46.17°EDhruma — 25.52°N, 45.19°EDhruma — 25.38°N, 45.35°EDhruma — 24.66°N, 46.05°EDhruma — 24.67°N, 46.05°EDhruma — 24.55°N, 46.13°EDhruma — 23.21°N, 46.43°EDhruma — 22.83°N, 46.12°EDjangura — 43.90°N, 41.45°EDjangura — 43.90°N, 41.56°EDjangura — 44.13°N, 40.80°EDjangura — 43.97°N, 41.76°EDjangura — 43.94°N, 41.89°EDjangura — 43.85°N, 41.14°EDjangura — 43.85°N, 41.75°EDjangura — 43.97°N, 41.53°EDjangura — 43.90°N, 41.80°ETsudakhar — 42.47°N, 46.65°ETsudakhar — 42.56°N, 46.34°ETsudakhar — 42.65°N, 46.93°ETsudakhar — 41.97°N, 47.90°ETsudakhar — 42.38°N, 46.96°ETsudakhar — 42.33°N, 47.60°ETsudakhar — 42.26°N, 47.53°ETsudakhar — 42.81°N, 45.63°ETsudakhar — 42.62°N, 47.29°ETsudakhar — 42.58°N, 46.15°ETsudakhar — 42.16°N, 47.63°ETsudakhar — 42.61°N, 46.99°ETsudakhar — 42.45°N, 46.85°ETsudakhar — 42.34°N, 47.16°ETsudakhar — 42.49°N, 46.74°ETsudakhar — 42.69°N, 46.50°ETsudakhar — 42.24°N, 47.52°EDalichai — 37.09°N, 56.74°EDalichai — 37.15°N, 57.15°EDalichai — 36.32°N, 54.43°EDalichai — 36.39°N, 54.82°EDalichai — 36.39°N, 54.29°EParkinsonian-Oolith — 48.86°N, 10.34°EParkinsonian-Oolith — 48.86°N, 10.35°ETaberna — 16.78°N, 96.95°WTaberna — 17.58°N, 97.83°W"Berching" — 49.23°N, 11.47°ETwin Creek Limestone — 42.87°N, 111.17°WTwin Creek Limestone — 42.84°N, 111.15°WTwin Creek Limestone — 42.40°N, 111.04°WTwin Creek Limestone — 42.17°N, 110.83°WTwin Creek Limestone — 42.08°N, 111.00°WTwin Creek Limestone — 42.10°N, 110.85°WTwin Creek Limestone — 42.00°N, 110.85°WTwin Creek Limestone — 41.92°N, 111.25°WTwin Creek Limestone — 41.51°N, 111.30°WTwin Creek Limestone — 41.45°N, 111.37°WTwin Creek Limestone — 41.06°N, 111.55°WTwin Creek Limestone — 40.42°N, 110.78°WChaloi — 39.91°N, 54.19°EChaloi — 39.75°N, 54.50°EChaloi — 39.80°N, 54.38°EChaloi — 39.85°N, 54.26°EChaloi — 39.92°N, 54.12°EDegibadam — 37.71°N, 66.61°EDegibadam — 38.00°N, 66.90°EDegibadam — 37.97°N, 66.73°EDegibadam — 38.21°N, 67.01°EDegibadam — 38.22°N, 67.21°EDegibadam — 37.63°N, 66.62°EDegibadam — 37.85°N, 66.69°EDegibadam — 38.23°N, 67.45°ESawtooth — 48.16°N, 112.87°WSawtooth — 46.65°N, 113.21°WSawtooth — 45.36°N, 111.57°WSawtooth — 45.28°N, 111.28°WPiper — 45.59°N, 110.58°WPiper — 45.56°N, 110.20°WPiper — 45.50°N, 110.65°WPiper — 45.08°N, 110.79°WTasharvat — 39.75°N, 54.37°ETasharvat — 39.72°N, 54.44°EOolithe ferrugineuse de Bayeux — 49.08°N, 0.47°WOolithe ferrugineuse de Bayeux — 49.03°N, 0.42°WGuemgouma — 35.10°N, 9.71°ESnowshoe — 44.13°N, 118.98°WMeulam — 39.92°N, 54.12°EMeulam — 39.94°N, 54.15°EKambe — 4.02°S, 39.55°ETölgyhát — 47.28°N, 18.10°EAsientos — 25.97°S, 69.18°WSmithers — 56.73°N, 127.35°WCalcaire de Caen — 48.97°N, 0.13°WGypsum Spring — 44.43°N, 109.04°WNewmarracarra Limestone — 28.79°S, 114.80°ENewmarracarra Limestone — 28.75°S, 114.85°E

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The named rock units Stephanoceratidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 25 further formations hold fewer occurrences each and are not listed. 125 occurrences have no formation on record, which is common for older literature.

Stephanoceratidae and its relatives

Middle Jurassic

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

Found in the same rock

607 taxa

The Paleobiology Database records 311 sites for Stephanoceratidae, and this reads 240 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

66 references

Each of the 616 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. 54 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 Stephanoceratidae

Credit
nobody named on the record
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

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 itStephanoceratoidea through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Neumayr 1875