Spiroceras

Spiroceras is a genus of extinct ammonites.

Spiroceras

Ghedoghedo · 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
SpiroceratidaePBDB
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 most 5.6 million years on record.

Every occurrence read is dated to somewhere between 170.9 Mya and 165.3 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Middle Jurassic — about 22 of 22 occurrencesMiddle Jurassic171–171 Mya — about 0.6 occurrences171–171 Mya — about 0.8 occurrences171–170 Mya — about 0.8 occurrences170–170 Mya — about 0.8 occurrences170–170 Mya — about 0.8 occurrences170–170 Mya — about 0.8 occurrences170–169 Mya — about 0.8 occurrences169–169 Mya — about 0.8 occurrences169–169 Mya — about 0.8 occurrences169–169 Mya — about 0.8 occurrences169–169 Mya — about 2 occurrences169–168 Mya — about 6 occurrences168–168 Mya — about 4 occurrences168–168 Mya — about 0.2 occurrences168–168 Mya — about 0.2 occurrences168–167 Mya — about 0.2 occurrences167–167 Mya — about 0.2 occurrences167–167 Mya — about 0.2 occurrences167–167 Mya — about 0.2 occurrences167–167 Mya — about 0.2 occurrences167–166 Mya — about 0.2 occurrences166–166 Mya — about 0.2 occurrences166–166 Mya — about 0.2 occurrences166–166 Mya — about 0.2 occurrences166–165 Mya — about 0.2 occurrences165–165 Mya — about 0.1 occurrences171.4 Mya164.8 Mya

22 occurrences of Spiroceras 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

22 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

12 formations

Djangura — 43.95°N, 41.51°EDjangura — 43.97°N, 41.76°EDhruma — 24.23°N, 46.58°EDhruma — 24.08°N, 45.50°ECuber — 39.85°N, 3.20°ETwin Creek Limestone — 42.20°N, 110.82°WTwin Creek Limestone — 42.00°N, 110.85°WDalichai — 37.15°N, 57.15°ECaleta Lígate — 20.40°S, 70.09°WCalcaire de Caen — 48.97°N, 0.13°W"Berching" — 49.23°N, 11.47°EParkinsonian-Oolith — 48.86°N, 10.35°ETsudakhar — 42.65°N, 46.93°EKambe — 4.02°S, 39.55°EOolithe ferrugineuse de Bayeux — 49.03°N, 0.42°W

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The named rock units Spiroceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Spiroceras and its relatives

Middle Jurassic

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

Found in the same rock

172 taxa

The Paleobiology Database records 17 sites for Spiroceras, 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

13 references

Each of the 22 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. 1 further reference is 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 Spiroceras

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

No 3D scan of Spiroceras 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 itSpiroceratidae through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.