Distichoceras

Distichoceras is a member of the Haploceratacean family, Oppeliidae, and type genus for the subfamily Distichoceratinae, found in upper Middle and lower Upper Jurassic sediments in Europe, Algeria, India, and Madagascar. The shell is essentially evolute and compressed with the outer flanks converging on a narrow, keeled venter; inner flanks which may be feebly ribbed, are separated from outer by a shallow spiral groove or band. Ribs on outer flanks end on or are looped to tall clavi that line the venter, standing above the keel.

Distichoceras

Nicolas Théobald · CC BY-SA 4.0 · 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
DistichoceratinaePBDB
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 3.8 million years on record.

Every occurrence read is dated to somewhere between 165.3 Mya and 161.5 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Middle Jurassic — about 9 of 9 occurrencesMiddle JurassicLate Jurassic — about 0 of 9 occurrences165–165 Mya — about 0.3 occurrences165–165 Mya — about 0.4 occurrences165–165 Mya — about 0.4 occurrences165–165 Mya — about 0.4 occurrences165–165 Mya — about 0.4 occurrences165–164 Mya — about 0.4 occurrences164–164 Mya — about 0.4 occurrences164–164 Mya — about 0.4 occurrences164–164 Mya — about 0.4 occurrences164–164 Mya — about 0.4 occurrences164–164 Mya — about 0.4 occurrences164–163 Mya — about 0.4 occurrences163–163 Mya — about 0.4 occurrences163–163 Mya — about 0.4 occurrences163–163 Mya — about 0.4 occurrences163–163 Mya — about 0.4 occurrences163–163 Mya — about 0.4 occurrences163–162 Mya — about 0.4 occurrences162–162 Mya — about 0.4 occurrences162–162 Mya — about 0.4 occurrences162–162 Mya — about 0.4 occurrences162–162 Mya — about 0.4 occurrences162–162 Mya — about 0.4 occurrences162–161 Mya — about 0.3 occurrences165.8 Mya161 Mya

9 occurrences of Distichoceras on record, most of them in the Middle 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

9 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

"Sengenthal" — 49.23°N, 11.47°E

Loading coastlines…

The named rock units Distichoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 8 occurrences have no formation on record, which is common for older literature.

Distichoceras and its relatives

Middle Jurassic

Where Distichoceras and its relatives were recorded in the Middle Jurassic.

Found in the same rock

50 taxa

The Paleobiology Database records 6 sites for Distichoceras, 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

3 references

Each of the 9 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 the Paleobiology Database's own record for the work.

Media and terms

Media content2

Picture of Distichoceras

Credit
Nicolas Théobald
Licence
CC BY-SA 4.0
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 itDistichoceratinae through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.