Acompsoceras

Acompsoceras is an extinct genus of cephalopod belonging to the Ammonite subclass. It grew to a large size compared to most ammonites. Its shell reached 18 inches (46 cm) in diameter when the animal reached adulthood. Acompsoceras appears in the fossil record during the early portion of the Cretaceous Cenomanian stage and goes extinct around the middle of that same stage.

Acompsoceras

Hectonichus · 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
AcanthoceratinaePBDB
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 9.6 million years on record.

The record covers at least 110.1 Mya to 100.5 Mya. No occurrence read is dated outside 113.2 Mya to 93.9 Mya.

Early Cretaceous — about 4 of 29 occurrencesEarly CretaceousLate Cretaceous — about 25 of 29 occurrencesLate Cretaceous114–113 Mya — about 0.2 occurrences113–112 Mya — about 0.7 occurrences112–112 Mya — about 0.7 occurrences112–111 Mya — about 0.7 occurrences111–110 Mya — about 0.7 occurrences110–110 Mya — about 0.2 occurrences107–106 Mya — about 0.0 occurrences106–106 Mya — about 0.1 occurrences106–105 Mya — about 0.1 occurrences105–104 Mya — about 0.1 occurrences104–104 Mya — about 0.1 occurrences104–103 Mya — about 0.1 occurrences103–102 Mya — about 0.1 occurrences102–102 Mya — about 0.1 occurrences102–101 Mya — about 0.1 occurrences101–100 Mya — about 1 occurrence100–99 Mya — about 3 occurrences99–99 Mya — about 3 occurrences99–98 Mya — about 3 occurrences98–97 Mya — about 3 occurrences97–97 Mya — about 3 occurrences97–96 Mya — about 3 occurrences96–95 Mya — about 3 occurrences95–95 Mya — about 3 occurrences95–94 Mya — about 3 occurrences94–93 Mya — about 0.7 occurrences110.1 Mya100.5 Mya113.7 Mya93.4 Mya

29 occurrences of Acompsoceras on record. 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

29 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

11 formations

Hilo — 3.67°N, 74.89°WWest Melbury Marly Chalk — 51.20°N, 2.18°WCraie Glauconieuse — 49.08°N, 0.50°EOdukpani — 4.57°N, 6.98°ECotinguiba — 10.76°S, 37.07°WCraie de Rouen — 49.60°N, 0.12°ECraie de Rouen — 49.08°N, 0.50°EBaddeckenstedt — 52.18°N, 7.87°EBuda Limestone — 30.71°N, 104.77°WHalal — 30.67°N, 33.42°EHibernian Greensands — 54.63°N, 5.96°WChispa Summit — 30.71°N, 104.77°W

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The named rock units Acompsoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 9 occurrences have no formation on record, which is common for older literature.

Found in the same rock

135 taxa

The Paleobiology Database records 23 sites for Acompsoceras, 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

14 references

Each of the 29 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. 2 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 content2

Picture of Acompsoceras

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

3D model

Source
Sketchfab
Credit
Steinkern
Licence
CC Attribution-NonCommercial
Commercial use
the licence does not allow it

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 itAcanthoceratinae through timeThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Hyatt 1903