Gyronchus

Gyronchus is an extinct genus of prehistoric marine pycnodont fish from the Jurassic. This genus is currently treated as a wastebasket taxon, with several genera such as Macromesodon and Turbomesodon being split out of it. The type species, G. oblongus Agassiz, 1844 is known from the Bathonian-aged Stonesfield Slate of England. Another apparent freshwater species, G. dumblei is known from the Early Cretaceous-aged Paluxy Formation of Texas, US and the Antlers Formation of Oklahoma, but is more likely a member of Turbomesodon.

Gyronchus

User:Haplochromis · CC BY-SA 3.0 · 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
PycnodontiformesPBDB
Diet
durophage, carnivorePBDB, for Pycnodontiformes
Life habit
nektonicPBDB, for Pycnodontiformes
Motility
actively mobilePBDB, for Pycnodontiformes

Time the record covers

At most 20 million years on record.

Every occurrence read is dated to somewhere between 119.57 Mya and 100.5 Mya, and nothing in the dating separates them, so that window is what the record shows rather than a span.

Early Cretaceous — about 2 of 2 occurrencesEarly CretaceousLate Cretaceous — about 0 of 2 occurrences120–119 Mya — about 0.0 occurrences119–119 Mya — about 0.1 occurrences119–118 Mya — about 0.1 occurrences118–117 Mya — about 0.1 occurrences117–117 Mya — about 0.1 occurrences117–116 Mya — about 0.1 occurrences116–115 Mya — about 0.1 occurrences115–115 Mya — about 0.1 occurrences115–114 Mya — about 0.1 occurrences114–113 Mya — about 0.1 occurrences113–113 Mya — about 0.1 occurrences113–112 Mya — about 0.1 occurrences112–111 Mya — about 0.1 occurrences111–111 Mya — about 0.1 occurrences111–110 Mya — about 0.1 occurrences110–109 Mya — about 0.1 occurrences109–109 Mya — about 0.1 occurrences109–108 Mya — about 0.1 occurrences108–107 Mya — about 0.1 occurrences107–107 Mya — about 0.1 occurrences107–106 Mya — about 0.1 occurrences106–105 Mya — about 0.1 occurrences105–105 Mya — about 0.1 occurrences105–104 Mya — about 0.1 occurrences104–103 Mya — about 0.1 occurrences103–103 Mya — about 0.1 occurrences103–102 Mya — about 0.1 occurrences102–101 Mya — about 0.1 occurrences101–101 Mya — about 0.1 occurrences101–100 Mya — about 0.0 occurrences120.1 Mya100 Mya

2 occurrences of Gyronchus on record, most of them in the Early Cretaceous. 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

2 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

2 formations

Paluxy — 32.22°N, 98.20°WAntlers — 34.15°N, 95.82°W

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The named rock units Gyronchus has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Gyronchus and its relatives

Early Cretaceous

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

Found in the same rock

51 taxa

The Paleobiology Database records 2 sites for Gyronchus, 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

2 references

Each of the 2 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. 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 Gyronchus

Credit
User:Haplochromis
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

No 3D scan of Gyronchus was found in Sketchfab.

Smithsonian Open Access and MorphoSource were 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 itPycnodontiformes through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Agassiz 1839