Michelinoceras

Michelinoceras is the oldest known genus of the Michelinocerida, more commonly known as the Orthocerida, characterized by long, slender, nearly cylindrical orthocones with a circular cross section, long camerae, very long body chambers, and a central or near central tubular siphuncle free of organic deposits. Septal necks are straight; connecting rings cylindrical and thin. Cameral deposits are well developed. A radula has been found in one species, with seven teeth per row. It had ten arms, two of which formed longer tentacles.

Michelinoceras

Haplochromis · 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
OrthoceratidaePBDB
Diet
carnivorePBDB, for Orthocerida
Life habit
nektonicPBDB, for Orthocerida
Motility
actively mobilePBDB, for Orthocerida
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Orthocerida

Time the record covers

At least 243 million years on record.

The record covers at least 470.3 Mya to 227.3 Mya. No occurrence read is dated outside 478.8 Mya to 205.7 Mya.

Ordovician — about 154 of 298 occurrencesOrdovicianSilurian — about 66 of 298 occurrencesSilurianDevonian — about 34 of 298 occurrencesDevonianCarboniferous — about 18 of 298 occurrencesCarboniferousPermian — about 8 of 298 occurrencesPermianEarly Triassic — about 0 of 298 occurrencesMiddle Triassic — about 3 of 298 occurrencesLate Triassic — about 15 of 298 occurrencesLate TriassicEarly Jurassic — about 0 of 298 occurrences484–475 Mya — about 2 occurrences475–465 Mya — about 18 occurrences465–456 Mya — about 50 occurrences456–446 Mya — about 78 occurrences446–437 Mya — about 11 occurrences437–427 Mya — about 14 occurrences427–418 Mya — about 48 occurrences418–409 Mya — about 10 occurrences409–399 Mya — about 3 occurrences399–390 Mya — about 3 occurrences390–380 Mya — about 16 occurrences380–371 Mya — about 0.2 occurrences371–361 Mya — about 0.2 occurrences361–352 Mya — about 2 occurrences352–342 Mya — about 3 occurrences342–333 Mya — about 3 occurrences333–323 Mya — about 9 occurrences314–304 Mya — about 1 occurrence304–295 Mya — about 2 occurrences295–285 Mya — about 0.7 occurrences285–276 Mya — about 2 occurrences276–267 Mya — about 2 occurrences257–248 Mya — about 1 occurrence248–238 Mya — about 2 occurrences238–229 Mya — about 11 occurrences229–219 Mya — about 3 occurrences219–210 Mya — about 1 occurrence210–200 Mya — about 0.6 occurrences470.3 Mya227.3 Mya484 Mya200 Mya

298 occurrences of Michelinoceras 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

298 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

121 formations

Baota — 33.00°N, 111.00°EBaota — 29.00°N, 109.00°EBaota — 29.00°N, 107.00°EBaota — 32.00°N, 105.00°EBaota — 28.00°N, 109.00°EBaota — 29.00°N, 110.00°EBaota — 29.00°N, 111.00°EBaota — 30.00°N, 111.00°EBaota — 32.00°N, 118.00°EBaota — 31.00°N, 117.00°EBaota — 30.00°N, 116.00°EBaota — 33.00°N, 106.00°EBaota — 33.00°N, 108.00°EBaota — 32.00°N, 119.00°EBaota — 32.00°N, 100.00°EOverton — 52.48°N, 2.63°WDunleith — 43.00°N, 91.00°WLuning — 38.87°N, 117.62°WFluminimaggiore — 39.43°N, 8.50°EFluminimaggiore — 39.32°N, 8.53°EFluminimaggiore — 39.50°N, 8.50°ELudlowville — 42.96°N, 78.13°WLudlowville — 42.83°N, 77.84°WLudlowville — 42.80°N, 77.27°WLudlowville — 42.78°N, 76.99°WLudlowville — 42.85°N, 78.64°WLudlowville — 42.85°N, 78.37°WLudlowville — 43.00°N, 79.00°WGuniutan — 33.00°N, 111.00°EGuniutan — 29.00°N, 110.00°EGuniutan — 30.00°N, 111.00°EGuniutan — 30.00°N, 117.00°EGuniutan — 32.00°N, 119.00°EDawan — 27.00°N, 108.00°EDawan — 29.00°N, 110.00°EDawan — 30.00°N, 111.00°EDawan — 31.00°N, 111.00°ERacine — 42.73°N, 87.78°WRacine — 42.88°N, 88.04°WRacine — 43.05°N, 88.01°WTangtou — 32.00°N, 118.00°ETangtou — 32.00°N, 119.00°ECummingsville — 44.50°N, 92.90°WCummingsville — 45.00°N, 93.00°WIon — 43.00°N, 91.00°WChedao — 37.00°N, 107.00°EChedao — 36.00°N, 107.00°ELower Longhope Beds — 52.00°N, 2.00°WUpper Longhope Beds — 52.00°N, 2.00°WAber Mawr Shale — 51.93°N, 5.20°WPitkin — 35.80°N, 91.91°WRead Bay — 74.70°N, 94.82°WRead Bay — 74.83°N, 93.43°WAntelope Valley — 39.09°N, 116.85°WAntelope Valley — 39.00°N, 116.62°WWufeng — 33.00°N, 111.00°EWufeng — 32.00°N, 108.00°EFengdonggang — 29.00°N, 109.00°EFengdonggang — 29.00°N, 107.00°EJianchaogou — 29.00°N, 107.00°EJianchaogou — 28.00°N, 109.00°EShizipu — 28.00°N, 109.00°EShizipu — 29.00°N, 109.00°ELinxiang — 32.00°N, 108.00°ELinxiang — 30.00°N, 111.00°E

Loading coastlines…

The named rock units Michelinoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 97 further formations hold fewer occurrences each and are not listed. 39 occurrences have no formation on record, which is common for older literature.

Michelinoceras and its relatives

Ordovician

Where Michelinoceras and its relatives were recorded in the Ordovician.

Found in the same rock

1,897 taxa

The Paleobiology Database records 263 sites for Michelinoceras, and this reads 240 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

91 references

Each of the 298 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. 79 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 Michelinoceras

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

3D model

Source
Sketchfab
Licence
CC Attribution
Commercial use
cannot be read from the licence given — check the record

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 itOrthoceratidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Foerste 1932