Isopoda

Isopoda is an order of crustaceans. Members of this group are collectively called isopods and include both aquatic species such as gribbles and terrestrial species such as woodlice. All have rigid, segmented exoskeletons, two pairs of antennae, seven pairs of jointed limbs on the thorax, and five pairs of branching appendages on the abdomen that are used in respiration. Females brood their young in a pouch under their thorax called the marsupium.

Isopoda

Hans Hillewaert · 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
Also called
isopodPBDB
Sits inside
MancoidaPBDB
Diet
omnivorePBDB, for Malacostraca
Life habit
epifaunalPBDB, for Malacostraca
Motility
actively mobilePBDB, for Malacostraca
Vision
well-developedPBDB, for Malacostraca

Time the record covers

At least 307 million years on record.

The record covers at least 307.4 Mya to 129 ka. No occurrence read is dated outside 309.8 Mya to 0 Mya.

Carboniferous — about 3 of 163 occurrencesPermian — about 6 of 163 occurrencesPermianEarly Triassic — about 0 of 163 occurrencesMiddle Triassic — about 5 of 163 occurrencesLate Triassic — about 2 of 163 occurrencesLate TriassicEarly Jurassic — about 0 of 163 occurrencesMiddle Jurassic — about 20 of 163 occurrencesLate Jurassic — about 6 of 163 occurrencesEarly Cretaceous — about 34 of 163 occurrencesEarly CretaceousLate Cretaceous — about 23 of 163 occurrencesLate CretaceousPaleocene — about 1 of 163 occurrencesEocene — about 17 of 163 occurrencesOligocene — about 12 of 163 occurrencesMiocene — about 21 of 163 occurrencesPliocene — about 3 of 163 occurrencesPleistocene — about 10 of 163 occurrences316–305 Mya — about 1 occurrence305–295 Mya — about 2 occurrences284–274 Mya — about 0.1 occurrences274–263 Mya — about 0.9 occurrences263–253 Mya — about 5 occurrences253–242 Mya — about 5 occurrences242–232 Mya — about 2 occurrences179–169 Mya — about 16 occurrences169–158 Mya — about 4 occurrences158–147 Mya — about 5 occurrences147–137 Mya — about 3 occurrences137–126 Mya — about 5 occurrences126–116 Mya — about 9 occurrences116–105 Mya — about 8 occurrences105–95 Mya — about 21 occurrences95–84 Mya — about 6 occurrences84–74 Mya — about 3 occurrences74–63 Mya — about 3 occurrences63–53 Mya — about 2 occurrences53–42 Mya — about 3 occurrences42–32 Mya — about 14 occurrences32–21 Mya — about 12 occurrences21–11 Mya — about 17 occurrences11–0 Mya — about 15 occurrences307.4 Mya129 ka316 Mya0 Mya

163 occurrences of Isopoda on record, most of them in the Early Cretaceous. 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

163 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

58 formations

Sierra Madre — 16.68°N, 93.46°WOpalinus Clay — 47.33°N, 7.84°EOpalinus Clay — 47.46°N, 8.15°EEscucha — 42.64°N, 2.72°WOpalinuston — 47.43°N, 8.15°EMakah — 48.32°N, 124.50°WMakah — 48.32°N, 124.45°WMakah — 48.16°N, 123.79°WLe Mans — 48.00°N, 0.21°ELa Quinta — 17.15°N, 92.71°WFord — 54.89°N, 1.41°WTlayúa — 18.59°N, 97.90°WPysht — 48.18°N, 124.05°WPysht — 48.15°N, 123.86°WSan Juan Raya — 18.33°N, 97.57°WOpalinuston — 47.95°N, 7.82°EZechstein — 51.49°N, 6.55°EZechstein — 50.70°N, 11.60°EAkrabou — 30.51°N, 4.84°WAustin Chalk — 29.49°N, 98.42°WAustin Chalk — 32.99°N, 96.81°WLiegende Bankkalk — 48.12°N, 8.87°EEguino — 42.88°N, 2.20°WGrès à Voltzia — 48.73°N, 7.17°EGrès à Voltzia — 48.82°N, 7.24°EBembridge Marls — 50.73°N, 1.38°WReingrabener Schiefer — 47.88°N, 15.07°ELakota — 44.28°N, 103.39°WCodó — 3.82°S, 42.75°WEstancia 25 de Mayo — 50.51°S, 72.25°WJurensismergel — 47.95°N, 7.82°E

Loading coastlines…

The named rock units Isopoda has been recovered from, largest first. Drawn where the rock is now, not where it formed. 34 further formations hold fewer occurrences each and are not listed. 56 occurrences have no formation on record, which is common for older literature.

Isopoda and its relatives

Early Cretaceous

Where Isopoda and its relatives were recorded in the Early Cretaceous.

Found in the same rock

2,293 taxa

The Paleobiology Database records 119 sites for Isopoda, 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

86 references

Each of the 163 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. 74 further references are 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 content3

Picture of Isopoda

Credit
Hans Hillewaert
Licence
CC BY-SA 4.0
Commercial use
the licence allows it

CT scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Isopoda indet. · mcz:iz:90105

3D model

Source
Sketchfab
Licence
CC Attribution-NonCommercial-ShareAlike
Commercial use
the licence does not allow it

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 itMancoida through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Latreille 1817