Eotrigonodon

Eotrigonodon is a dubious form genus of ray-finned fish known from the Cretaceous to the Eocene. It is known only from isolated teeth. Formerly considered an early genus of tetraodontiform fish in the family "Eotrigonodontidae", more recent studies indicate that they likely represent the pharyngeal teeth of pycnodonts, which are an unrelated, entirely extinct group of fish. In addition, it may itself be a junior synonym for Stephanodus, another taxon based on pycnodont teeth. Yet other authors retain the genus as taxonomically unresolved.

Eotrigonodon

Uncredited · 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
EotrigonodontidaePBDB
Motility
actively mobilePBDB, for Osteichthyes

Time the record covers

At least 45 million years on record.

The record covers at least 93.9 Mya to 48.07 Mya. No occurrence read is dated outside 100.5 Mya to 33.9 Mya.

Early Cretaceous — about 0 of 32 occurrencesLate Cretaceous — about 6 of 32 occurrencesLate CretaceousPaleocene — about 1 of 32 occurrencesPaleoceneEocene — about 25 of 32 occurrencesEoceneOligocene — about 0 of 32 occurrences102–100 Mya — about 0.3 occurrences100–97 Mya — about 0.7 occurrences97–95 Mya — about 0.7 occurrences95–93 Mya — about 0.3 occurrences74–72 Mya — about 0.2 occurrences72–70 Mya — about 1 occurrence70–67 Mya — about 1 occurrence67–65 Mya — about 0.8 occurrences65–63 Mya — about 0.1 occurrences63–60 Mya — about 0.1 occurrences60–58 Mya — about 0.2 occurrences58–56 Mya — about 0.6 occurrences56–53 Mya — about 2 occurrences53–51 Mya — about 2 occurrences51–49 Mya — about 2 occurrences49–46 Mya — about 5 occurrences46–44 Mya — about 5 occurrences44–42 Mya — about 5 occurrences42–39 Mya — about 2 occurrences39–37 Mya — about 0.2 occurrences37–35 Mya — about 0.2 occurrences35–33 Mya — about 0.1 occurrences93.9 Mya48.07 Mya102 Mya33 Mya

32 occurrences of Eotrigonodon on record, most of them in the Eocene. 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

32 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

13 formations

Dammam — 25.23°N, 50.83°EDammam — 25.43°N, 50.80°ESelsey — 50.80°N, 1.21°WElmore — 50.80°N, 1.20°WSubathu — 30.98°N, 76.98°EAruma — 28.76°N, 43.74°EUmm al-Rua’us — 26.43°N, 50.11°ELameta — 20.35°N, 79.05°EKithar — 30.60°N, 70.38°ETeberemt, Tamaguélelt, Continental Terminal — 16.30°N, 2.75°EBuchak — 49.53°N, 39.07°EArgile des Flandres — 50.83°N, 4.34°EAlcântara — 2.48°S, 44.46°WCambay Shale — 21.40°N, 73.08°E

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The named rock units Eotrigonodon has been recovered from, largest first. Drawn where the rock is now, not where it formed. 9 occurrences have no formation on record, which is common for older literature.

Eotrigonodon and its relatives

Eocene

Where Eotrigonodon and its relatives were recorded in the Eocene.

Found in the same rock

525 taxa

The Paleobiology Database records 29 sites for Eotrigonodon, 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

19 references

Each of the 32 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. 7 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 Eotrigonodon

Credit
nobody named on the record
Licence
not stated by the source
Commercial use
cannot be read from the licence given — check the record

No 3D scan of Eotrigonodon 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 itEotrigonodontidae through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Weiler 1929