Julida

Julida is an order of millipedes. Members are mostly small and cylindrical, typically ranging from 10–120 millimetres (0.39–4.72 in) in length. Eyes may be present or absent, and in mature males of many species, the first pair of legs is modified into hook-like structures. Additionally, both pairs of legs on the 7th body segment of males are modified into gonopods.

Julida

Stemonitis · CC BY 2.5 · 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
JuliformiaPBDB
Motility
actively mobilePBDB, for Arthropoda

Time the record covers

At least 45 million years on record.

The record covers at least 45.9 Mya to 129 ka. No occurrence read is dated outside 51.1 Mya to 11.7 ka.

Eocene — about 6 of 18 occurrencesEoceneOligocene — about 5 of 18 occurrencesOligoceneMiocene — about 3 of 18 occurrencesMiocenePliocene — about 1 of 18 occurrencesPleistocene — about 3 of 18 occurrences52–50 Mya — about 0.1 occurrences50–49 Mya — about 0.3 occurrences49–47 Mya — about 0.3 occurrences47–45 Mya — about 0.2 occurrences38–36 Mya — about 1 occurrence36–35 Mya — about 2 occurrences35–33 Mya — about 2 occurrences33–31 Mya — about 0.8 occurrences31–30 Mya — about 0.8 occurrences30–28 Mya — about 0.8 occurrences28–26 Mya — about 0.8 occurrences26–24 Mya — about 0.8 occurrences24–23 Mya — about 0.7 occurrences23–21 Mya — about 0.2 occurrences21–19 Mya — about 0.2 occurrences19–17 Mya — about 0.2 occurrences17–16 Mya — about 0.2 occurrences14–12 Mya — about 1 occurrence12–10 Mya — about 0.9 occurrences7.0–5.2 Mya — about 0.0 occurrences5.2–3.5 Mya — about 0.6 occurrences3.5–1.7 Mya — about 0.8 occurrences1.7–0 Mya — about 3 occurrences45.9 Mya129 ka52 Mya0 Mya

18 occurrences of Julida on record, most of them in the Eocene. The Paleobiology Database records this as a living group. 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

18 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

Thermalsinterkalk — 48.41°N, 9.55°EGreen River — 41.56°N, 109.55°WOnyx Marble — 35.10°N, 112.59°WSystem B — 19.01°S, 138.67°EFlorissant — 38.92°N, 105.28°W

Loading coastlines…

The named rock units Julida has been recovered from, largest first. Drawn where the rock is now, not where it formed. 12 occurrences have no formation on record, which is common for older literature.

Julida and its relatives

Eocene

Where Julida and its relatives were recorded in the Eocene.

Found in the same rock

902 taxa

The Paleobiology Database records 15 sites for Julida, 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

13 references

Each of the 18 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. 1 further reference is not listed. 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 Julida

Credit
Stemonitis
Licence
CC BY 2.5
Commercial use
the licence allows it

No 3D scan was found. Smithsonian Open Access, MorphoSource and Sketchfab were all searched.

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 itJuliformia through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Leach 1814