Dayiceras

Dayiceras is a finely ribbed polymorphitid eoderoceratacean ammonoid cephalopod from the Jurassic, named by Spath in 1920. The shell is evolute, coiled such that all whorls are exposed. The whorl section is compressed such as to be higher than wide. A row of fine tubercles runs along the middle of the outer rim, the venter.

Dayiceras

via iDigBio · CC BY · 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
TropidoceratinaePBDB
Diet
carnivorePBDB, for Ammonoidea
Life habit
nektonicPBDB, for Ammonoidea
Motility
fast-movingPBDB, for Ammonoidea
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At most 8.7 million years on record.

Every occurrence read is dated to somewhere between 192.9 Mya and 184.2 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Early Jurassic — about 6 of 6 occurrencesEarly Jurassic193–193 Mya — about 0.1 occurrences193–192 Mya — about 0.2 occurrences192–192 Mya — about 0.2 occurrences192–192 Mya — about 0.2 occurrences192–191 Mya — about 0.2 occurrences191–191 Mya — about 0.2 occurrences191–191 Mya — about 0.2 occurrences191–190 Mya — about 0.2 occurrences190–190 Mya — about 0.2 occurrences190–190 Mya — about 0.2 occurrences190–190 Mya — about 0.2 occurrences190–189 Mya — about 0.2 occurrences189–189 Mya — about 0.2 occurrences189–189 Mya — about 0.2 occurrences189–188 Mya — about 0.2 occurrences188–188 Mya — about 0.2 occurrences188–188 Mya — about 0.2 occurrences188–187 Mya — about 0.2 occurrences187–187 Mya — about 0.2 occurrences187–187 Mya — about 0.2 occurrences187–186 Mya — about 0.2 occurrences186–186 Mya — about 0.2 occurrences186–186 Mya — about 0.2 occurrences186–185 Mya — about 0.2 occurrences185–185 Mya — about 0.2 occurrences185–185 Mya — about 0.2 occurrences185–184 Mya — about 0.2 occurrences184–184 Mya — about 0.1 occurrences193.4 Mya183.7 Mya

6 occurrences of Dayiceras on record, most of them in the Early Jurassic. 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

Spatsizi — 57.49°N, 128.89°WBelemnite Marls — 50.72°N, 2.85°WMaude — 53.20°N, 132.06°W

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

Dayiceras and its relatives

Early Jurassic

Where Dayiceras and its relatives were recorded in the Early Jurassic.

Found in the same rock

13 taxa

The Paleobiology Database records 6 sites for Dayiceras, and this reads all of them. The number is how many of those sites it was catalogued from too.

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

3 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 Dayiceras

Source
iDigBio
Credit
via iDigBio
Licence
CC BY
Commercial use
the licence allows it

No 3D scan of Dayiceras 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 itTropidoceratinae through timeFormations of the Early JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.