Chondrostei

Chondrostei is a subclass of non-neopterygian ray-finned fish. While the term originally referred to the paraphyletic grouping of all non-neopterygian ray-finned fish, it was redefined by Patterson in 1982 to be a clade comprising the Acipenseriformes and their extinct relatives. The ancestors of Chondrostei are thought to have split from those of other living fish around the Carboniferous period. The oldest unambiguous members of Acipenseriformes known from the Early Jurassic.

Chondrostei

Duane Raver/U.S. Fish and Wildlife Service · Public Domain · via Wikidata/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
ActinopterygiiPBDB
Motility
actively mobilePBDB, for Osteichthyes

Time the record covers

At least 251 million years on record.

The record covers at least 251.902 Mya to 11.7 ka. No occurrence read is dated outside 259.857 Mya to 0 Mya.

Permian — about 1 of 240 occurrencesEarly Triassic — about 6 of 240 occurrencesMiddle Triassic — about 4 of 240 occurrencesLate Triassic — about 4 of 240 occurrencesLate TriassicEarly Jurassic — about 15 of 240 occurrencesEarly JurassicMiddle Jurassic — about 1 of 240 occurrencesLate Jurassic — about 0 of 240 occurrencesEarly Cretaceous — about 15 of 240 occurrencesEarly CretaceousLate Cretaceous — about 134 of 240 occurrencesLate CretaceousPaleocene — about 12 of 240 occurrencesEocene — about 13 of 240 occurrencesEoceneOligocene — about 1 of 240 occurrencesMiocene — about 18 of 240 occurrencesPliocene — about 3 of 240 occurrencesPleistocene — about 8 of 240 occurrences265–256 Mya — about 0.5 occurrences256–247 Mya — about 6 occurrences247–239 Mya — about 4 occurrences239–230 Mya — about 0.8 occurrences230–221 Mya — about 1 occurrence221–212 Mya — about 1 occurrence212–203 Mya — about 0.8 occurrences203–194 Mya — about 7 occurrences194–186 Mya — about 2 occurrences186–177 Mya — about 5 occurrences177–168 Mya — about 1 occurrence168–159 Mya — about 0.9 occurrences150–141 Mya — about 0.1 occurrences141–133 Mya — about 1 occurrence133–124 Mya — about 4 occurrences124–115 Mya — about 9 occurrences115–106 Mya — about 0.6 occurrences106–97 Mya — about 1 occurrence97–88 Mya — about 4 occurrences88–80 Mya — about 30 occurrences80–71 Mya — about 63 occurrences71–62 Mya — about 46 occurrences62–53 Mya — about 6 occurrences53–44 Mya — about 7 occurrences44–35 Mya — about 2 occurrences35–27 Mya — about 0.2 occurrences27–18 Mya — about 0.8 occurrences18–8.8 Mya — about 13 occurrences8.8–0 Mya — about 21 occurrences251.902 Mya11.7 ka265 Mya0 Mya

240 occurrences of Chondrostei on record, most of them in the Late 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

240 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

71 formations

Dinosaur Park — 50.81°N, 111.32°WDinosaur Park — 49.12°N, 110.47°WDinosaur Park — 50.82°N, 111.57°WDinosaur Park — 50.74°N, 111.49°WDinosaur Park — 50.77°N, 111.51°WDinosaur Park — 50.75°N, 111.40°WDinosaur Park — 50.68°N, 108.09°WHell Creek — 47.80°N, 106.10°WHell Creek — 46.03°N, 103.77°WHell Creek — 46.21°N, 103.77°WHell Creek — 45.95°N, 103.96°WHell Creek — 46.10°N, 103.30°WHell Creek — 46.33°N, 103.90°WHell Creek — 45.94°N, 103.95°WHell Creek — 47.55°N, 107.13°WHell Creek — 47.62°N, 107.32°WHell Creek — 47.52°N, 106.42°WHell Creek — 47.07°N, 106.92°WHell Creek — 47.60°N, 107.23°WHell Creek — 47.75°N, 106.20°WHell Creek — 47.61°N, 106.90°WHell Creek — 45.50°N, 103.10°WHell Creek — 45.00°N, 103.19°WHell Creek — 46.19°N, 103.40°WLance — 43.30°N, 104.37°WLance — 43.12°N, 104.64°WLance — 41.57°N, 108.67°WLance — 41.58°N, 108.65°WLance — 43.15°N, 104.57°WLance — 43.17°N, 104.53°WLance — 43.13°N, 104.49°WYixian — 41.60°N, 120.87°EYixian — 41.20°N, 119.23°EYixian — 40.00°N, 116.67°EYixian — 41.17°N, 119.40°EYixian — 41.42°N, 118.97°EPrince Creek — 70.02°N, 151.59°WPrince Creek — 70.09°N, 151.54°WFort Union — 46.05°N, 104.48°WFort Union — 46.90°N, 101.50°WFort Union — 47.60°N, 107.00°WOldman — 49.08°N, 110.84°WOldman — 50.76°N, 111.53°WCalvert — 38.67°N, 76.53°WCalvert — 38.17°N, 76.87°WCalvert — 37.93°N, 77.51°WCalvert — 38.16°N, 76.83°WLondon Clay — 51.85°N, 1.27°ELondon Clay — 51.40°N, 0.83°EJudith River — 46.47°N, 109.30°WJudith River — 46.46°N, 109.41°WJudith River — 46.10°N, 109.10°WJudith River — 48.56°N, 107.78°WHorseshoe Canyon — 52.00°N, 112.88°WHorseshoe Canyon — 53.56°N, 113.43°WHorseshoe Canyon — 51.67°N, 112.91°WGrès à Voltzia — 48.91°N, 7.20°EGrès à Voltzia — 48.73°N, 7.17°EGrès à Voltzia — 48.82°N, 7.24°EGrès à Voltzia — 48.78°N, 7.25°EFruitland — 36.49°N, 108.49°WForemost — 50.07°N, 111.14°WForemost — 49.13°N, 110.87°WElmore — 50.80°N, 1.20°WSelsey — 50.80°N, 1.21°WTullock — 47.80°N, 106.10°WTullock — 47.60°N, 107.00°WBissekty — 42.12°N, 62.66°EKhodzhakul — 40.10°N, 65.80°ECromer Forest Bed — 52.88°N, 1.44°EMooreville Chalk — 32.76°N, 88.02°WMooreville Chalk — 32.96°N, 88.13°WWhitemud — 49.61°N, 105.75°WWhitemud — 49.62°N, 105.78°WHuajiying — 40.37°N, 116.36°ELockatong — 40.17°N, 75.35°WLockatong — 40.26°N, 75.03°W

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The named rock units Chondrostei has been recovered from, largest first. Drawn where the rock is now, not where it formed. 47 further formations hold fewer occurrences each and are not listed. 31 occurrences have no formation on record, which is common for older literature.

Chondrostei and its relatives

Late Cretaceous

Where Chondrostei and its relatives were recorded in the Late Cretaceous.

Found in the same rock

3,159 taxa

The Paleobiology Database records 203 sites for Chondrostei, and this reads all 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

115 references

Each of the 240 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. 103 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 Chondrostei

Credit
Duane Raver/U.S. Fish and Wildlife Service
Licence
Public Domain
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 itActinopterygii through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. (Müller 1844)