Trachypachidae

The Trachypachidae are a family of beetles that generally resemble small ground beetles, but that are distinguished by the large coxae of their rearmost legs. There are only six known extant species in the family, with four species of Trachypachus found in northern Eurasia and northern North America, and two species of Systolosoma in Chile and Argentina. They were originally more diverse, with dozens of species described in the Mesozoic.

Trachypachidae

Yves Bousquet · CC BY 3.0 · 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
false ground beetlePBDB
Sits inside
AdephagaPBDB
Motility
actively mobilePBDB, for Arthropoda
Environment
terrestrialPBDB, for Insecta

Time the record covers

At least 250 million years on record.

The record covers at least 251.1 Mya to 129 ka. No occurrence read is dated outside 251.902 Mya to 11.7 ka.

Permian — about 0 of 105 occurrencesEarly Triassic — about 4 of 105 occurrencesMiddle Triassic — about 1 of 105 occurrencesLate Triassic — about 12 of 105 occurrencesLate TriassicEarly Jurassic — about 21 of 105 occurrencesEarly JurassicMiddle Jurassic — about 2 of 105 occurrencesLate Jurassic — about 35 of 105 occurrencesEarly Cretaceous — about 23 of 105 occurrencesEarly CretaceousLate Cretaceous — about 0 of 105 occurrencesPaleocene — about 0 of 105 occurrencesEocene — about 0 of 105 occurrencesOligocene — about 0 of 105 occurrencesMiocene — about 3 of 105 occurrencesPliocene — about 1 of 105 occurrencesPleistocene — about 3 of 105 occurrences257–248 Mya — about 4 occurrences248–240 Mya — about 0.4 occurrences240–231 Mya — about 2 occurrences231–223 Mya — about 3 occurrences223–214 Mya — about 4 occurrences214–206 Mya — about 4 occurrences206–197 Mya — about 1 occurrence197–188 Mya — about 1.0 occurrences188–180 Mya — about 18 occurrences180–171 Mya — about 0.5 occurrences171–163 Mya — about 1 occurrence163–154 Mya — about 7 occurrences154–146 Mya — about 23 occurrences146–137 Mya — about 7 occurrences137–128 Mya — about 2 occurrences128–120 Mya — about 5 occurrences120–111 Mya — about 14 occurrences111–103 Mya — about 1 occurrence103–94 Mya — about 0.4 occurrences17–8.6 Mya — about 1 occurrence8.6–0 Mya — about 6 occurrences251.1 Mya129 ka257 Mya0 Mya

105 occurrences of Trachypachidae on record, most of them in the Late Jurassic. 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

105 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

31 formations

Posidonia Shale — 52.35°N, 10.74°EPosidonia Shale — 52.36°N, 10.59°EPosidonia Shale — 52.31°N, 10.62°EPosidonia Shale — 52.27°N, 10.68°EKarabastau — 42.90°N, 70.00°EKarabastau — 42.69°N, 70.41°EGlushkovo — 51.71°N, 116.93°EGlushkovo — 51.86°N, 117.45°EGlushkovo — 51.92°N, 117.62°EGlushkovo — 51.65°N, 117.41°EBlackstone — 27.62°S, 152.75°EGurvan-Eren — 46.38°N, 93.95°EGurvan-Eren — 48.07°N, 91.65°EMaltsevo — 54.40°N, 87.54°EZaza — 53.30°N, 112.09°EDaohugou — 41.32°N, 119.24°EYixian — 41.62°N, 120.83°EYixian — 41.54°N, 118.92°ELushangfen — 39.80°N, 116.08°EDzhil — 42.70°N, 77.20°ETologoi — 47.50°N, 85.20°EUkurei — 52.31°N, 117.04°EIchetuy — 50.64°N, 105.43°EIchetuy — 51.27°N, 108.10°EHuachi-Huanhe — 36.88°N, 108.20°EHuachi-Huanhe — 35.16°N, 106.97°EKap København — 82.47°N, 23.66°WJinju — 35.07°N, 128.07°EJinju — 35.75°N, 128.37°EMadygen — 40.03°N, 70.25°EAnda-Khuduk — 45.39°N, 101.84°ETignin — 50.08°N, 109.21°EUlaan-Ereg — 45.59°N, 107.79°EDzun-Bain — 45.45°N, 99.13°EShinekhudag — 44.72°N, 107.92°EUda — 52.37°N, 111.25°E

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The named rock units Trachypachidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 7 further formations hold fewer occurrences each and are not listed. 7 occurrences have no formation on record, which is common for older literature.

Trachypachidae and its relatives

Late Jurassic

Where Trachypachidae and its relatives were recorded in the Late Jurassic.

Found in the same rock

3,165 taxa

The Paleobiology Database records 66 sites for Trachypachidae, 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

28 references

Each of the 105 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. 16 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 content1

Picture of Trachypachidae

Credit
Yves Bousquet
Licence
CC BY 3.0
Commercial use
the licence allows it

No 3D scan of Trachypachidae was found in Smithsonian Open Access and Sketchfab.

MorphoSource 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 itAdephaga through timeFormations of the Late JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Thomson 1857