Discosorida

Discosorida are an order of cephalopods that lived from the beginning of the Middle Ordovician, through the Silurian, and into the Devonian. Discosorids are unique in the structure and formation of the siphuncle, the tube that runs through and connects the camerae (chambers) in cephalopods, which unlike those in other orders is zoned longitudinally along the segments rather than laterally. Siphuncle structure indicated that the Discosorida evolved directly from the Plectronoceratida rather than through the more developed Ellesmerocerida, as did the other orders. Finally and most diagnostic, discosorids developed a reinforcing, grommet-like structure in the septal opening of the siphuncle known as the bullette, formed by a thickening of the connecting ring as it draped around the folded back septal neck.

No picture of Discosorida 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 Discosorida, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
MulticeratoideaPBDB
Diet
carnivorePBDB, for Cephalopoda
Life habit
nektobenthicPBDB
Motility
actively mobilePBDB
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB

Time the record covers

At least 95 million years on record.

The record covers at least 468 Mya to 372.15 Mya. No occurrence read is dated outside 477.1 Mya to 358.86 Mya.

Ordovician — about 201 of 305 occurrencesOrdovicianSilurian — about 91 of 305 occurrencesSilurianDevonian — about 13 of 305 occurrencesDevonianCarboniferous — about 0 of 305 occurrences479–475 Mya — about 0.2 occurrences475–471 Mya — about 0.5 occurrences471–467 Mya — about 2 occurrences467–463 Mya — about 3 occurrences463–459 Mya — about 3 occurrences459–455 Mya — about 19 occurrences455–451 Mya — about 56 occurrences451–447 Mya — about 89 occurrences447–443 Mya — about 28 occurrences443–438 Mya — about 12 occurrences438–434 Mya — about 26 occurrences434–430 Mya — about 19 occurrences430–426 Mya — about 10 occurrences426–422 Mya — about 12 occurrences422–418 Mya — about 12 occurrences414–410 Mya — about 5 occurrences410–406 Mya — about 0.6 occurrences406–402 Mya — about 0.6 occurrences402–397 Mya — about 0.5 occurrences397–393 Mya — about 0.3 occurrences393–389 Mya — about 0.3 occurrences389–385 Mya — about 1 occurrence385–381 Mya — about 0.1 occurrences373–369 Mya — about 2 occurrences369–365 Mya — about 1 occurrence365–361 Mya — about 0.9 occurrences361–356 Mya — about 0.4 occurrences468 Mya372.15 Mya479 Mya356 Mya

305 occurrences of Discosorida 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

305 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

85 formations

Portage Chute — 58.00°N, 95.00°WPortage Chute — 56.50°N, 94.25°WPortage Chute — 58.50°N, 95.00°WAmadjuak — 63.72°N, 68.97°WAmadjuak — 65.25°N, 73.17°WAmadjuak — 68.77°N, 81.22°WDunleith — 43.00°N, 91.00°WJupiter — 49.47°N, 63.62°WJupiter — 49.38°N, 63.60°WJupiter — 49.19°N, 61.73°WJupiter — 49.28°N, 63.22°WJupiter — 49.42°N, 63.50°WWise Lake — 43.00°N, 91.00°WInwood — 53.17°N, 99.28°WVasalemma — 59.24°N, 24.29°EVasalemma — 59.23°N, 24.23°ERacine — 42.73°N, 87.78°WRacine — 42.88°N, 88.04°WRacine — 43.05°N, 88.01°WRacine — 41.85°N, 87.65°WFluminimaggiore — 39.43°N, 8.50°EFluminimaggiore — 39.32°N, 8.53°EFluminimaggiore — 39.50°N, 8.50°ESyracuse — 43.05°N, 76.15°WSyracuse — 43.05°N, 76.00°WSyracuse — 43.06°N, 76.14°WPozary — 49.93°N, 14.18°EPozary — 50.08°N, 14.47°EPozary — 49.15°N, 13.57°EBad Cache Rapids — 69.00°N, 81.67°WBad Cache Rapids — 69.23°N, 82.48°WBad Cache Rapids — 69.23°N, 82.25°WProsser Limestone — 45.00°N, 93.00°WStewartville — 45.00°N, 93.00°WStewartville — 43.50°N, 94.00°WCape Calhoun — 80.08°N, 67.00°WRed River — 50.00°N, 100.00°WRed River — 52.06°N, 97.44°WLyckholm — 59.00°N, 25.00°ELyckholm — 59.05°N, 24.03°EHopkinton — 43.00°N, 91.00°WHopkinton — 42.17°N, 90.58°WThornloe — 47.75°N, 79.82°WHemse Beds — 57.28°N, 18.32°EHemse Beds — 57.23°N, 18.37°EGlenwood — 45.00°N, 93.00°WGlenwood — 43.00°N, 91.00°WBighorn — 44.00°N, 109.00°WWhitewood Limestone — 44.00°N, 103.00°WMotol — 50.03°N, 14.38°EMotol — 49.48°N, 17.63°E

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The named rock units Discosorida has been recovered from, largest first. Drawn where the rock is now, not where it formed. 61 further formations hold fewer occurrences each and are not listed. 60 occurrences have no formation on record, which is common for older literature.

Discosorida and its relatives

Ordovician

Where Discosorida and its relatives were recorded in the Ordovician.

Found in the same rock

2,100 taxa

The Paleobiology Database records 176 sites for Discosorida, 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

65 references

Each of the 305 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. 53 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 Discosorida 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 Discosorida, or no answer at all. This entry cannot say which.

No 3D scan of Discosorida 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 itMulticeratoidea through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Flower 1950