Armenoceras

Armenoceras is a genus of actinocerid nautiloid cephalopods whose fossils ranged from the late Whiterockian Stage in the early Middle Ordovician, through the remainder of the period and on into the Upper Silurian. It is the type genus of the family Armenoceratidae.

Armenoceras

Jonathan Chen · CC BY 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
ArmenoceratidaePBDB
Diet
carnivorePBDB, for Actinocerida
Life habit
nektobenthicPBDB, for Actinocerida
Motility
actively mobilePBDB, for Actinocerida
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At least 226 million years on record.

The record covers at least 477.1 Mya to 250.8 Mya. No occurrence read is dated outside 486.85 Mya to 247 Mya.

Cambrian — about 0 of 122 occurrencesOrdovician — about 72 of 122 occurrencesOrdovicianSilurian — about 49 of 122 occurrencesSilurianDevonian — about 0 of 122 occurrencesCarboniferous — about 0 of 122 occurrencesPermian — about 0 of 122 occurrencesEarly Triassic — about 1 of 122 occurrencesMiddle Triassic — about 0 of 122 occurrences492–483 Mya — about 0.7 occurrences483–475 Mya — about 3 occurrences475–467 Mya — about 10 occurrences467–458 Mya — about 29 occurrences458–450 Mya — about 16 occurrences450–442 Mya — about 16 occurrences442–433 Mya — about 19 occurrences433–425 Mya — about 24 occurrences425–417 Mya — about 4 occurrences259–251 Mya — about 0.1 occurrences251–242 Mya — about 0.9 occurrences477.1 Mya250.8 Mya492 Mya242 Mya

122 occurrences of Armenoceras on record, most of them in the Ordovician. 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

122 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

43 formations

Shan Majiagou — 39.67°N, 118.26°EShan Majiagou — 39.00°N, 118.00°EShan Majiagou — 39.00°N, 115.00°EShan Majiagou — 36.00°N, 114.00°EShan Majiagou — 38.00°N, 111.00°EShan Majiagou — 38.00°N, 113.00°EShan Majiagou — 38.00°N, 114.00°EShan Majiagou — 36.00°N, 113.00°EShan Majiagou — 36.00°N, 112.00°EShan Majiagou — 40.00°N, 112.00°EShan Majiagou — 41.00°N, 123.00°EShan Majiagou — 40.00°N, 123.00°EShan Majiagou — 35.00°N, 112.00°ERead Bay — 74.84°N, 93.51°WRead Bay — 74.68°N, 94.16°WRead Bay — 74.73°N, 94.94°WRead Bay — 74.70°N, 94.82°WJupiter — 49.20°N, 61.73°WJupiter — 49.16°N, 62.72°WJupiter — 49.16°N, 62.80°WJupiter — 49.38°N, 63.40°WKhkoma — 67.04°N, 103.77°EDubuque — 45.00°N, 93.00°WDubuque — 43.00°N, 91.00°WXia Majiagou — 40.00°N, 118.00°EXia Majiagou — 39.00°N, 115.00°EXia Majiagou — 42.00°N, 126.00°EUpham — 32.57°N, 107.72°WUpham — 31.78°N, 106.48°WMaquoketa — 45.00°N, 93.00°WScales Shale — 43.00°N, 91.00°WKhaastyrka — 67.32°N, 103.85°EKhaastyrka — 67.33°N, 104.85°EKhaastyrka — 67.34°N, 103.88°ELhasai — 31.27°N, 89.17°EAberdeen Lake — 64.90°N, 98.81°WAberdeen Lake — 64.90°N, 98.73°WWhitewater — 39.00°N, 84.00°WSteinsfjorden — 60.17°N, 10.30°ESteinsfjorden — 68.79°N, 14.95°EFengfeng — 38.00°N, 114.00°EFengfeng — 36.00°N, 113.00°ESandaogou — 37.00°N, 107.00°ESandaogou — 36.00°N, 107.00°EMaJiaGou — 37.00°N, 118.00°EMaJiaGou — 42.00°N, 126.00°EDuwibong — 37.19°N, 128.74°EKhandyg — 62.20°N, 138.15°EKhandyg — 62.93°N, 138.10°EBønsnes — 60.06°N, 10.21°EBønsnes — 66.77°N, 13.47°ELa Vieille — 48.20°N, 64.80°WMoyerokan — 67.34°N, 104.10°ELiberty — 39.00°N, 84.00°WSanqiaojia — 27.00°N, 103.00°E

Loading coastlines…

The named rock units Armenoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 19 further formations hold fewer occurrences each and are not listed. 10 occurrences have no formation on record, which is common for older literature.

Armenoceras and its relatives

Ordovician

Where Armenoceras and its relatives were recorded in the Ordovician.

Found in the same rock

844 taxa

The Paleobiology Database records 108 sites for Armenoceras, 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

43 references

Each of the 122 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. 31 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 Armenoceras

Credit
Jonathan Chen
Licence
CC BY 4.0
Commercial use
the licence allows it

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 itArmenoceratidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Foerste 1924