Cyrtogomphoceras

Cyrtogomphoceras is a genus of nautiloid cephalopods, recognized by its large breviconic shell with a notable endogastric curvature. The shell is fusiform in profile, reaching maximum width at or near the base of body chamber, which narrows toward the aperture. The siphuncle is large and slightly removed from the ventral side, that with the concave longitudinal profile. Siphuncle segments are short, as are chambers; septal necks recurved, connecting rings thick, bullettes at the apical end of the rings swollen. Cameral deposits are lacking.

Cyrtogomphoceras

via iDigBio · via iDigBio. 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
CyrtogomphoceratidaePBDB
Diet
carnivorePBDB, for Cephalopoda
Life habit
nektobenthicPBDB, for Discosorida
Motility
actively mobilePBDB, for Discosorida
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Discosorida

Time the record covers

At least 1 million years on record.

The record covers at least 450.2 Mya to 449.2 Mya. No occurrence read is dated outside 471.3 Mya to 443.1 Mya.

Ordovician — about 39 of 39 occurrencesOrdovicianSilurian — about 0 of 39 occurrences472–471 Mya — about 0.1 occurrences471–470 Mya — about 0.2 occurrences470–469 Mya — about 0.2 occurrences469–468 Mya — about 0.2 occurrences468–467 Mya — about 0.2 occurrences467–466 Mya — about 0.2 occurrences466–465 Mya — about 0.2 occurrences465–464 Mya — about 0.2 occurrences464–463 Mya — about 0.2 occurrences463–462 Mya — about 0.2 occurrences462–461 Mya — about 0.2 occurrences461–460 Mya — about 0.2 occurrences460–459 Mya — about 0.2 occurrences459–458 Mya — about 0.2 occurrences458–457 Mya — about 0.4 occurrences457–456 Mya — about 0.6 occurrences456–455 Mya — about 0.6 occurrences455–454 Mya — about 0.6 occurrences454–453 Mya — about 1 occurrence453–452 Mya — about 1 occurrence452–451 Mya — about 1 occurrence451–450 Mya — about 7 occurrences450–449 Mya — about 6 occurrences449–448 Mya — about 5 occurrences448–447 Mya — about 4 occurrences447–446 Mya — about 4 occurrences446–445 Mya — about 4 occurrences445–444 Mya — about 0.4 occurrences444–444 Mya — about 0.4 occurrences444–443 Mya — about 0.2 occurrences450.2 Mya – 449.2 Mya471.9 Mya442.5 Mya

39 occurrences of Cyrtogomphoceras 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

39 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

12 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°WBad Cache Rapids — 69.00°N, 81.67°WBad Cache Rapids — 69.23°N, 82.48°WCape Calhoun — 80.08°N, 67.00°WNelson River Limestone — 57.07°N, 92.50°WShamattawa Limestone — 52.00°N, 102.00°WRed River — 50.00°N, 100.00°WFremont — 38.50°N, 105.17°WBighorn — 44.00°N, 109.00°WWhitewood Limestone — 44.00°N, 103.00°WLyckholm — 59.00°N, 25.00°EIrene Bay — 74.98°N, 95.88°W

Loading coastlines…

The named rock units Cyrtogomphoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 7 occurrences have no formation on record, which is common for older literature.

Cyrtogomphoceras and its relatives

Ordovician

Where Cyrtogomphoceras and its relatives were recorded in the Ordovician.

Found in the same rock

231 taxa

The Paleobiology Database records 23 sites for Cyrtogomphoceras, 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

6 references

Each of the 39 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. 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 Cyrtogomphoceras

Source
iDigBio
Credit
via iDigBio
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

No 3D scan of Cyrtogomphoceras was found in Sketchfab.

Smithsonian Open Access and MorphoSource were 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 itCyrtogomphoceratidae through timeFormations of the OrdovicianThe world it lived on

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