Allocrioceras

Searched as Allocrioceras annulatum. The Paleobiology Database treats Allocrioceras as the accepted name.

Allocrioceras is an ammonoid cephalopod from the Turonian to Santonian stages of the Late Cretaceous, included in the turrilitoid family Anisoceratidae. Its shell is strongly ribbed and is in the form of a widely open spiral.

Allocrioceras

Kevmin · CC BY-SA 3.0 · 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
AnisoceratidaePBDB
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 11 million years on record.

Every occurrence read is dated to somewhere between 100.5 Mya and 89.8 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Early Cretaceous — about 0 of 10 occurrencesLate Cretaceous — about 10 of 10 occurrencesLate Cretaceous101–100 Mya — about 0.4 occurrences100–100 Mya — about 0.6 occurrences100–99 Mya — about 0.6 occurrences99–99 Mya — about 0.6 occurrences99–99 Mya — about 0.6 occurrences99–98 Mya — about 0.6 occurrences98–98 Mya — about 0.6 occurrences98–97 Mya — about 0.6 occurrences97–97 Mya — about 0.6 occurrences97–97 Mya — about 0.6 occurrences97–96 Mya — about 0.6 occurrences96–96 Mya — about 0.6 occurrences96–96 Mya — about 0.6 occurrences96–95 Mya — about 0.6 occurrences95–95 Mya — about 0.6 occurrences95–94 Mya — about 0.6 occurrences94–94 Mya — about 0.6 occurrences94–94 Mya — about 0.1 occurrences94–93 Mya — about 0.0 occurrences93–93 Mya — about 0.0 occurrences93–92 Mya — about 0.0 occurrences92–92 Mya — about 0.0 occurrences92–92 Mya — about 0.0 occurrences92–91 Mya — about 0.0 occurrences91–91 Mya — about 0.0 occurrences91–90 Mya — about 0.0 occurrences90–90 Mya — about 0.0 occurrences90–90 Mya — about 0.0 occurrences101 Mya89.3 Mya

10 occurrences of Allocrioceras on record, most of them in the Late Cretaceous. 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

10 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

5 formations

Tropic Shale — 37.29°N, 112.69°WTropic Shale — 37.08°N, 111.64°WTropic Shale — 37.21°N, 111.17°WMancos Shale — 35.97°N, 110.84°WMancos Shale — 34.83°N, 108.97°WBritton — 32.56°N, 97.04°WBritton — 32.54°N, 97.07°WDorozhkovo — 70.12°N, 86.75°EDorozhkovo — 70.11°N, 86.72°EGreenhorn — 45.02°N, 104.30°W

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The named rock units Allocrioceras has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Allocrioceras and its relatives

Late Cretaceous

Where Allocrioceras and its relatives were recorded in the Late Cretaceous.

Found in the same rock

180 taxa

The Paleobiology Database records 45 sites for Allocrioceras, 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

7 references

Each of the 10 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. 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 Allocrioceras

Credit
Kevmin
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

No 3D scan of Allocrioceras was found in MorphoSource and Sketchfab.

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 itAnisoceratidae through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Spath 1926