Graphoceras

Graphoceras is an extinct ammonite genus included in the hildoceratacean family Graphoceratidae that lived during the Aalenian and Bajocian stages, Middle Jurassic in what is now Europe, north Africa, and Iran.

Graphoceras

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
GraphoceratinaePBDB
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 6.5 million years on record.

Every occurrence read is dated to somewhere between 174.7 Mya and 168.2 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Early Jurassic — about 0 of 95 occurrencesMiddle Jurassic — about 95 of 95 occurrencesMiddle Jurassic175–174 Mya — about 5 occurrences174–174 Mya — about 5 occurrences174–174 Mya — about 5 occurrences174–174 Mya — about 5 occurrences174–173 Mya — about 5 occurrences173–173 Mya — about 5 occurrences173–173 Mya — about 5 occurrences173–173 Mya — about 5 occurrences173–172 Mya — about 5 occurrences172–172 Mya — about 5 occurrences172–172 Mya — about 5 occurrences172–172 Mya — about 5 occurrences172–171 Mya — about 5 occurrences171–171 Mya — about 5 occurrences171–171 Mya — about 5 occurrences171–171 Mya — about 2 occurrences171–170 Mya — about 1 occurrence170–170 Mya — about 1 occurrence170–170 Mya — about 1 occurrence170–170 Mya — about 1 occurrence170–169 Mya — about 1 occurrence169–169 Mya — about 1 occurrence169–169 Mya — about 1 occurrence169–169 Mya — about 1 occurrence169–168 Mya — about 1 occurrence168–168 Mya — about 1 occurrence175.2 Mya167.7 Mya

95 occurrences of Graphoceras 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

95 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

5 formations

Agoudim — 32.24°N, 4.26°WCastillo Pedroso — 43.02°N, 4.17°WTölgyhát — 47.71°N, 18.48°EKef el Orma — 36.35°N, 10.07°EHauptbank — 47.93°N, 8.67°E

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The named rock units Graphoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 38 occurrences have no formation on record, which is common for older literature.

Graphoceras and its relatives

Middle Jurassic

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

Found in the same rock

120 taxa

The Paleobiology Database records 31 sites for Graphoceras, 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

11 references

Each of the 95 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 Graphoceras

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

No 3D scan of Graphoceras 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 itGraphoceratinae through timeFormations of the Middle JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.