Johnlongia

Johnlongia is an extinct genus of sand shark from the Cretaceous period. It contains two described species, J. parvidens and J. allocotodon, and possibly a third unnamed species from the Niobrara Chalk. It is presumed piscivorous; however, it forms a clade with an early filter-feeding shark genus, Pseudomegachasma.

No picture of Johnlongia was found. Wikipedia, Wikidata and iDigBio were searched and had none. Smithsonian Open Access did not answer, so this is what the others held rather than everything there is. GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Johnlongia, or no answer at all. This entry cannot say which.

On record

Recorded, not inferred
Sits inside
JohnlonginaePBDB
Diet
carnivorePBDB, for Lamniformes
Life habit
nektonicPBDB, for Lamniformes
Motility
actively mobilePBDB, for Lamniformes

Time the record covers

At least 33 million years on record.

The record covers at least 119.57 Mya to 85.7 Mya. No occurrence read is dated outside 121.4 Mya to 83.6 Mya.

Early Cretaceous — about 1 of 25 occurrencesEarly CretaceousLate Cretaceous — about 24 of 25 occurrencesLate Cretaceous122–121 Mya — about 0.3 occurrences121–120 Mya — about 0.7 occurrences101–100 Mya — about 0.6 occurrences100–99 Mya — about 1 occurrence99–97 Mya — about 1 occurrence97–96 Mya — about 1 occurrence96–95 Mya — about 1 occurrence95–93 Mya — about 3 occurrences93–92 Mya — about 5 occurrences92–91 Mya — about 5 occurrences91–89 Mya — about 4 occurrences89–88 Mya — about 0.6 occurrences88–87 Mya — about 0.6 occurrences87–85 Mya — about 0.6 occurrences85–84 Mya — about 0.6 occurrences84–83 Mya — about 0.3 occurrences119.57 Mya85.7 Mya122.2 Mya82.8 Mya

25 occurrences of Johnlongia on record, most of them in the Late 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

25 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

12 formations

Carlile Shale — 43.40°N, 103.36°WCarlile Shale — 38.72°N, 99.32°WCarlile Shale — 47.01°N, 107.87°WCarlile Shale — 43.25°N, 103.92°WCarlile Shale — 44.09°N, 104.68°WCarlile — 43.87°N, 104.27°WCarlile — 43.96°N, 104.44°WCarlile — 44.14°N, 104.71°WCarlile — 43.40°N, 103.36°WKaskapau — 55.71°N, 117.60°WDunvegan — 55.92°N, 118.22°WDunvegan — 55.92°N, 118.60°WHaycock Marl — 27.60°S, 114.23°EGreenhorn — 44.76°N, 103.75°WTres Hermanos — 34.31°N, 106.74°WGreenhorn Limestone — 37.22°N, 103.60°WMelovatka — 51.56°N, 45.97°ENiobrara — 38.81°N, 100.01°WSpeeton Clay — 54.15°N, 0.17°WAtco — 32.53°N, 96.99°W

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The named rock units Johnlongia has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 occurrences have no formation on record, which is common for older literature.

Johnlongia and its relatives

Late Cretaceous

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

Found in the same rock

146 taxa

The Paleobiology Database records 25 sites for Johnlongia, 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

16 references

Each of the 25 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. 4 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 content0

No picture of Johnlongia was found. Wikipedia, Wikidata and iDigBio were searched and had none.

Smithsonian Open Access did not answer, so this is what the others held rather than everything there is.

GBIF was asked, and what came back is not recorded: nothing, or a picture this site could not tie to Johnlongia, or no answer at all. This entry cannot say which.

No 3D scan of Johnlongia 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 itJohnlonginae through timeFormations of the Late CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Siverson 1996