Cyrtonybyoceras

Cyrtonybyoceras is a genus of slightly exogastric members of the Wutinoceratidae, a family of actinocerids and probably derived from an earlier Wutinoceras. The shell of Cyrtonybyoceras is curved slightly upwardly and is slightly compressed. Sutures slope toward the aperture, from the dorsum to the venter. The siphuncle is ventral but not marginal, in general form like that of Nybyoceras. Upper and lower septal necks are recumbent or narrowly free. The canal system is reticular, characteristic of the Wutinoceratidae.

Cyrtonybyoceras

via iDigBio · CC0 · 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
WutinoceratidaePBDB
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 6.9 million years on record.

The record covers at least 468 Mya to 461.1 Mya. No occurrence read is dated outside 477.1 Mya to 457.3 Mya.

Ordovician — about 6 of 6 occurrencesOrdovician478–477 Mya — about 0.0 occurrences477–476 Mya — about 0.1 occurrences476–476 Mya — about 0.1 occurrences476–475 Mya — about 0.1 occurrences475–474 Mya — about 0.1 occurrences474–473 Mya — about 0.1 occurrences473–473 Mya — about 0.1 occurrences473–472 Mya — about 0.1 occurrences472–471 Mya — about 0.1 occurrences471–471 Mya — about 0.2 occurrences471–470 Mya — about 0.2 occurrences470–469 Mya — about 0.2 occurrences469–469 Mya — about 0.2 occurrences469–468 Mya — about 0.2 occurrences468–467 Mya — about 0.3 occurrences467–467 Mya — about 0.3 occurrences467–466 Mya — about 0.3 occurrences466–465 Mya — about 0.3 occurrences465–464 Mya — about 0.3 occurrences464–464 Mya — about 0.3 occurrences464–463 Mya — about 0.3 occurrences463–462 Mya — about 0.3 occurrences462–462 Mya — about 0.3 occurrences462–461 Mya — about 0.3 occurrences461–460 Mya — about 0.4 occurrences460–460 Mya — about 0.4 occurrences460–459 Mya — about 0.4 occurrences459–458 Mya — about 0.4 occurrences458–457 Mya — about 0.1 occurrences457–457 Mya — about 0.0 occurrences468 Mya461.1 Mya477.6 Mya456.8 Mya

6 occurrences of Cyrtonybyoceras 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

6 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

3 formations

Shan Majiagou — 39.67°N, 118.26°EShan Majiagou — 36.00°N, 114.00°ETable Point — 50.70°N, 57.41°WTable Point — 50.36°N, 57.54°WMaJiaGou — 37.00°N, 118.00°E

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The named rock units Cyrtonybyoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Cyrtonybyoceras and its relatives

Ordovician

Where Cyrtonybyoceras and its relatives were recorded in the Ordovician.

Found in the same rock

64 taxa

The Paleobiology Database records 6 sites for Cyrtonybyoceras, 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

4 references

Each of the 6 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 Cyrtonybyoceras

Source
iDigBio
Credit
via iDigBio
Licence
CC0
Commercial use
the licence allows it

No 3D scan of Cyrtonybyoceras 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 itWutinoceratidae through timeFormations of the OrdovicianThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Teichert 1933