Dactylioceras

Searched as Dactylioceras (Orthodactylites) cf. tenuicostatum. The Paleobiology Database treats Dactylioceras as the accepted name.

Dactylioceras was a widespread genus of ammonites from the Lower Jurassic period, approximately 180 million years ago (mya).Like many other ammonites, the genus Dactylioceras is extremely important in biostratigraphy, being a key index fossil for identifying their region of the Jurassic. It had a nearly cosmopolitan distribution during the time it existed.

Dactylioceras

Kevmin · 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
DactylioceratinaePBDB
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 10 million years on record.

Every occurrence read is dated to somewhere between 192.9 Mya and 182.9 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Early Jurassic — about 2 of 2 occurrencesEarly Jurassic193–193 Mya — about 0.0 occurrences193–192 Mya — about 0.0 occurrences192–192 Mya — about 0.0 occurrences192–192 Mya — about 0.0 occurrences192–191 Mya — about 0.0 occurrences191–191 Mya — about 0.0 occurrences191–190 Mya — about 0.0 occurrences190–190 Mya — about 0.0 occurrences190–190 Mya — about 0.0 occurrences190–189 Mya — about 0.0 occurrences189–189 Mya — about 0.0 occurrences189–189 Mya — about 0.0 occurrences189–188 Mya — about 0.0 occurrences188–188 Mya — about 0.0 occurrences188–188 Mya — about 0.0 occurrences188–187 Mya — about 0.0 occurrences187–187 Mya — about 0.0 occurrences187–186 Mya — about 0.0 occurrences186–186 Mya — about 0.0 occurrences186–186 Mya — about 0.0 occurrences186–185 Mya — about 0.0 occurrences185–185 Mya — about 0.0 occurrences185–185 Mya — about 0.0 occurrences185–184 Mya — about 0.0 occurrences184–184 Mya — about 0.3 occurrences184–184 Mya — about 0.3 occurrences184–183 Mya — about 0.3 occurrences183–183 Mya — about 0.2 occurrences193.4 Mya182.4 Mya

2 occurrences of Dactylioceras 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

2 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

1 formation

Sailor Canyon — 39.20°N, 120.50°W

Loading coastlines…

The named rock units Dactylioceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 1 occurrence has no formation on record, which is common for older literature.

Dactylioceras and its relatives

Early Jurassic

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

Found in the same rock

275 taxa

The Paleobiology Database records 297 sites for Dactylioceras, 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

2 references

Each of the 2 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. Each entry links to doi.org. Relayed as the Paleobiology Database holds them, not checked against what they resolve to.

Media and terms

Media content2

Picture of Dactylioceras

Credit
Kevmin
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 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 itDactylioceratinae through timeFormations of the Early JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Hyatt 1867)