Bifericeras

Bifericeras is a Lower Jurassic ammonite belonging to the family Eoderoceratidae, and sometimes placed in the subfamily Xipherceratinae. Whorls are strongly depressed, but still evolute in coiling. The early growth state is prolonged, and smooth, followed by a late growth stage with rounded, straight, bituberculate ribs.

Bifericeras

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
EoderoceratinaePBDB
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 6.6 million years on record.

Every occurrence read is dated to somewhere between 199.5 Mya and 192.9 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Early Jurassic — about 17 of 17 occurrencesEarly Jurassic200–199 Mya — about 0.0 occurrences199–199 Mya — about 0.7 occurrences199–199 Mya — about 0.7 occurrences199–199 Mya — about 0.7 occurrences199–198 Mya — about 0.7 occurrences198–198 Mya — about 0.7 occurrences198–198 Mya — about 0.7 occurrences198–198 Mya — about 0.7 occurrences198–197 Mya — about 0.7 occurrences197–197 Mya — about 0.7 occurrences197–197 Mya — about 0.7 occurrences197–197 Mya — about 0.7 occurrences197–196 Mya — about 0.7 occurrences196–196 Mya — about 0.7 occurrences196–196 Mya — about 0.7 occurrences196–196 Mya — about 0.7 occurrences196–195 Mya — about 0.7 occurrences195–195 Mya — about 0.7 occurrences195–195 Mya — about 0.7 occurrences195–195 Mya — about 0.7 occurrences195–194 Mya — about 0.7 occurrences194–194 Mya — about 0.7 occurrences194–194 Mya — about 0.7 occurrences194–194 Mya — about 0.7 occurrences194–193 Mya — about 0.7 occurrences193–193 Mya — about 0.7 occurrences193–193 Mya — about 0.7 occurrences193–193 Mya — about 0.0 occurrences200 Mya192.4 Mya

17 occurrences of Bifericeras 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

17 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

2 formations

Lower Lias — 51.80°N, 1.88°WHuayacocotla — 20.33°N, 98.22°W

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The named rock units Bifericeras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 11 occurrences have no formation on record, which is common for older literature.

Bifericeras and its relatives

Early Jurassic

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

Found in the same rock

64 taxa

The Paleobiology Database records 8 sites for Bifericeras, 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 17 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 Bifericeras

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

No 3D scan of Bifericeras 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 itEoderoceratinae through timeFormations of the Early JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.