Anisoceras

Anisoceras is a heteromorph ammonite belonging to the turrilitoid family Anisoceratidae. The shell forms a loose open helical spiral in the early stages, ending in one or two straight shafts in the mature adult. Surface ornament consists of prominent rounded nodes on the lower and upper flanks, connected by strong looped ribs. The nodes may have been the bases of long sharp spines.

No picture of Anisoceras was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Anisoceras, or no answer at all. This entry cannot say which.

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 least 20 million years on record.

The record covers at least 110.1 Mya to 89.8 Mya. No occurrence read is dated outside 113.2 Mya to 85.7 Mya.

Early Cretaceous — about 119 of 157 occurrencesEarly CretaceousLate Cretaceous — about 38 of 157 occurrencesLate Cretaceous114–113 Mya — about 0.8 occurrences113–112 Mya — about 2 occurrences112–111 Mya — about 2 occurrences111–110 Mya — about 2 occurrences110–109 Mya — about 3 occurrences109–108 Mya — about 3 occurrences108–107 Mya — about 3 occurrences107–106 Mya — about 5 occurrences106–105 Mya — about 17 occurrences105–104 Mya — about 17 occurrences104–103 Mya — about 17 occurrences103–102 Mya — about 17 occurrences102–101 Mya — about 17 occurrences101–100 Mya — about 16 occurrences100–99 Mya — about 4 occurrences99–98 Mya — about 4 occurrences98–98 Mya — about 4 occurrences98–97 Mya — about 4 occurrences97–96 Mya — about 4 occurrences96–95 Mya — about 4 occurrences95–94 Mya — about 4 occurrences94–93 Mya — about 1 occurrence93–92 Mya — about 1 occurrence92–91 Mya — about 1 occurrence91–90 Mya — about 1 occurrence90–89 Mya — about 0.8 occurrences89–88 Mya — about 0.8 occurrences88–87 Mya — about 0.8 occurrences87–86 Mya — about 0.8 occurrences86–85 Mya — about 0.3 occurrences110.1 Mya89.8 Mya113.8 Mya85.2 Mya

157 occurrences of Anisoceras on record, most of them in the Early 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

157 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

33 formations

Grès verts helvétiques — 45.99°N, 6.71°EGrès verts helvétiques — 46.09°N, 6.76°EGrès verts helvétiques — 46.04°N, 6.62°EGrès verts helvétiques — 46.00°N, 6.77°EPerte du Rhône — 46.83°N, 6.52°EMancos Shale — 35.96°N, 110.89°WMancos Shale — 36.18°N, 109.88°WMancos Shale — 40.76°N, 108.89°WMarnes bleues — 44.33°N, 5.17°EBudden Canyon — 40.45°N, 122.56°WWeno — 32.75°N, 97.30°WWeno — 32.46°N, 97.39°WUpper Greensand — 50.75°N, 2.33°WUpper Greensand — 50.83°N, 2.60°WGarschella — 47.33°N, 9.54°EBrochterbeck — 52.22°N, 7.75°EWangarlu Mudstone — 12.38°S, 130.60°EWangarlu Mudstone — 12.25°S, 131.03°EGlauconitic Marl — 52.33°N, 2.28°WBeer Head Limestone — 50.83°N, 2.45°WBeer Head Limestone — 50.77°N, 2.57°WUnnamed Vocontian — 43.22°N, 5.53°EUnnamed Vocontian — 43.73°N, 6.90°ELower Chalk — 50.83°N, 2.60°WEnokuchi — 32.32°N, 130.35°ELewes Nodular Chalk — 51.88°N, 0.42°WLewes Nodular Chalk — 51.90°N, 0.26°WGreenhorn Limestone — 39.93°N, 105.28°WGreenhorn Limestone — 38.28°N, 104.72°WCatumbela — 12.35°S, 13.58°EZebbag — 36.15°N, 9.70°EHudspeth — 44.60°N, 120.20°WCraie Glauconieuse — 49.08°N, 0.50°EBargy Conglomerate — 46.00°N, 6.10°EMzinene — 26.92°S, 32.25°EHaida — 53.25°N, 132.00°W

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The named rock units Anisoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 9 further formations hold fewer occurrences each and are not listed. 61 occurrences have no formation on record, which is common for older literature.

Anisoceras and its relatives

Early Cretaceous

Where Anisoceras and its relatives were recorded in the Early Cretaceous.

Found in the same rock

835 taxa

The Paleobiology Database records 104 sites for Anisoceras, 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

45 references

Each of the 157 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. 33 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 content0

No picture of Anisoceras was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Anisoceras, or no answer at all. This entry cannot say which.

No 3D scan of Anisoceras 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 Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Pictet 1854)