Arachnida

Arachnids are arthropods in the class Arachnida of the subphylum Chelicerata. Arachnida includes, among others, spiders, scorpions, ticks, mites, pseudoscorpions, harvestmen, camel spiders, whip spiders and vinegaroons.

Arachnida

Lucarelli Maximilian Paradiz Jorge Armín Escalante Pasos Marshal Hedin Bernard DUPONT Cavexplorer Chantelle Bosch Ros… · 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
SclerophorataPBDB
Life habit
solitaryPBDB
Motility
actively mobilePBDB
Environment
terrestrialPBDB

Time the record covers

At least 432 million years on record.

The record covers at least 432.9 Mya to 11.7 ka. No occurrence read is dated outside 438.6 Mya to 0 Mya.

Ordovician — about 0 of 3960 occurrencesSilurian — about 18 of 3960 occurrencesDevonian — about 85 of 3960 occurrencesDevonianCarboniferous — about 437 of 3960 occurrencesCarboniferousPermian — about 15 of 3960 occurrencesPermianEarly Triassic — about 0 of 3960 occurrencesMiddle Triassic — about 28 of 3960 occurrencesLate Triassic — about 10 of 3960 occurrencesEarly Jurassic — about 2 of 3960 occurrencesMiddle Jurassic — about 6 of 3960 occurrencesLate Jurassic — about 14 of 3960 occurrencesEarly Cretaceous — about 126 of 3960 occurrencesEarly CretaceousLate Cretaceous — about 692 of 3960 occurrencesPaleocene — about 3 of 3960 occurrencesEocene — about 1866 of 3960 occurrencesOligocene — about 47 of 3960 occurrencesMiocene — about 503 of 3960 occurrencesPliocene — about 15 of 3960 occurrencesPleistocene — about 12 of 3960 occurrences447–432 Mya — about 2 occurrences432–418 Mya — about 19 occurrences418–403 Mya — about 44 occurrences403–388 Mya — about 9 occurrences388–373 Mya — about 26 occurrences373–358 Mya — about 3 occurrences358–343 Mya — about 9 occurrences343–328 Mya — about 33 occurrences328–313 Mya — about 203 occurrences313–298 Mya — about 192 occurrences298–283 Mya — about 8 occurrences283–268 Mya — about 3 occurrences268–254 Mya — about 2 occurrences254–239 Mya — about 29 occurrences239–224 Mya — about 6 occurrences224–209 Mya — about 3 occurrences209–194 Mya — about 0.6 occurrences194–179 Mya — about 2 occurrences179–164 Mya — about 2 occurrences164–149 Mya — about 17 occurrences149–134 Mya — about 1 occurrence134–119 Mya — about 34 occurrences119–104 Mya — about 68 occurrences104–89 Mya — about 688 occurrences89–75 Mya — about 22 occurrences75–60 Mya — about 6 occurrences60–45 Mya — about 36 occurrences45–30 Mya — about 1839 occurrences30–15 Mya — about 465 occurrences15–0 Mya — about 187 occurrences432.9 Mya11.7 ka447 Mya0 Mya

3,960 occurrences of Arachnida 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

3,960 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

182 formations

Carbondale — 41.34°N, 88.39°WCarbondale — 41.24°N, 88.21°WCarbondale — 41.32°N, 88.25°WCarbondale — 40.52°N, 89.89°WCarbondale — 39.95°N, 87.65°WFlorissant — 38.92°N, 105.28°WKladno — 50.10°N, 13.72°EKladno — 49.71°N, 13.21°EKladno — 49.86°N, 13.63°EKladno — 49.83°N, 14.59°EKladno — 50.24°N, 14.30°EKladno — 50.17°N, 14.09°EKladno — 49.85°N, 18.49°ECrato — 7.13°S, 39.70°WNiveau du gypse d'Aix — 43.52°N, 5.45°EShanwang — 36.55°N, 118.71°EPanther Mountain — 42.43°N, 74.43°WBarstow — 34.95°N, 116.83°WBarstow — 34.94°N, 116.83°WEscucha — 40.80°N, 0.81°WEscucha — 42.64°N, 2.72°WEscucha — 41.03°N, 0.56°WDryden Flags — 57.34°N, 2.84°WDryden Flags — 57.34°N, 2.85°WMazantic Shale — 17.15°N, 92.70°WDaohugou — 41.32°N, 119.24°EGrès à Voltzia — 48.83°N, 7.24°EGrès à Voltzia — 48.72°N, 7.17°EGrès à Voltzia — 48.91°N, 7.20°EGrès à Voltzia — 48.69°N, 7.38°EGrès à Voltzia — 48.78°N, 7.25°ERaritan — 40.47°N, 74.32°WGreen River — 41.56°N, 109.55°WGreen River — 39.23°N, 108.22°WGreen River — 39.72°N, 107.98°WGreen River — 39.72°N, 108.14°WGreen River — 39.64°N, 108.76°WUpper Freshwater-Molasse — 47.67°N, 8.93°EYixian — 41.19°N, 119.21°EYixian — 41.62°N, 120.83°EYixian — 41.95°N, 118.89°EFiddlers Green — 42.85°N, 78.80°WFiddlers Green — 42.96°N, 75.06°WFiddlers Green — 42.96°N, 75.41°WBromsgrove Sandstone — 52.33°N, 2.08°WBromsgrove Sandstone — 52.49°N, 1.84°WDunstan — 45.48°S, 169.31°EKheta — 71.63°N, 100.97°EKheta — 70.93°N, 98.64°EKheta — 72.00°N, 103.00°EKheta — 72.03°N, 101.33°EKheta — 71.31°N, 99.56°EEast Kirkton Limestone — 55.95°N, 3.20°WJinju — 35.08°N, 128.05°EMiddle Coal Measures — 52.99°N, 1.31°W

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The named rock units Arachnida has been recovered from, largest first. Drawn where the rock is now, not where it formed. 158 further formations hold fewer occurrences each and are not listed. 3,168 occurrences have no formation on record, which is common for older literature.

Arachnida and its relatives

Eocene

Where Arachnida and its relatives were recorded in the Eocene.

Found in the same rock

7,976 taxa

The Paleobiology Database records at least 307 sites for Arachnida, and this reads 240 of them. Of that, one read hit the database's own return limit, so every count below is a floor rather than a total. 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

711 references

Each of the 3,960 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. 699 further references are not listed. Each entry links to the Paleobiology Database's own record for the work.

Media and terms

Media content2

Picture of Arachnida

Credit
Lucarelli Maximilian Paradiz Jorge Armín Escalante Pasos Marshal Hedin Bernard DUPONT Cavexplorer Chantelle Bosch Ros…
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 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 itSclerophorata through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Lamarck 1801