Triakis

Triakis is a genus of houndsharks in the family Triakidae. The name comes from the Ancient Greek word τρι- meaning 'three', and the Latin word acis meaning 'sharp' or 'pointed', in reference to their three-pointed teeth.

Triakis

Mfield , Matthew Field, www.photography.mattfield.com · CC BY-SA 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
Sits inside
TriakinaePBDB
Diet
carnivorePBDB, for Carcharhiniformes
Life habit
nektonicPBDB, for Carcharhiniformes
Motility
actively mobilePBDB, for Carcharhiniformes

Time the record covers

At least 61 million years on record.

The record covers at least 61.66 Mya to 11.7 ka. No occurrence read is dated outside 72.2 Mya to 0 Mya.

Late Cretaceous — about 1 of 65 occurrencesLate CretaceousPaleocene — about 15 of 65 occurrencesPaleoceneEocene — about 34 of 65 occurrencesEoceneOligocene — about 1 of 65 occurrencesOligoceneMiocene — about 5 of 65 occurrencesMiocenePliocene — about 1 of 65 occurrencesPleistocene — about 7 of 65 occurrences74–71 Mya — about 0.1 occurrences71–69 Mya — about 0.2 occurrences69–66 Mya — about 0.2 occurrences66–64 Mya — about 4 occurrences64–61 Mya — about 4 occurrences61–59 Mya — about 2 occurrences59–56 Mya — about 4 occurrences56–54 Mya — about 3 occurrences54–52 Mya — about 3 occurrences52–49 Mya — about 3 occurrences49–47 Mya — about 4 occurrences47–44 Mya — about 4 occurrences44–42 Mya — about 4 occurrences42–39 Mya — about 3 occurrences39–37 Mya — about 3 occurrences37–34 Mya — about 6 occurrences34–32 Mya — about 1 occurrence32–29 Mya — about 0.4 occurrences29–27 Mya — about 0.3 occurrences22–20 Mya — about 0.2 occurrences20–17 Mya — about 0.5 occurrences17–15 Mya — about 0.8 occurrences15–12 Mya — about 0.4 occurrences12–9.8 Mya — about 0.4 occurrences9.8–7.4 Mya — about 0.6 occurrences7.4–4.9 Mya — about 2 occurrences4.9–2.5 Mya — about 1 occurrence2.5–0 Mya — about 8 occurrences61.66 Mya11.7 ka74 Mya0 Mya

65 occurrences of Triakis on record, most of them in the Eocene. 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

65 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

26 formations

Gehannam — 29.33°N, 30.08°EGehannam — 29.30°N, 30.05°EPalos Verdes Sand — 33.66°N, 117.90°WPalos Verdes Sand — 33.99°N, 118.45°WPalos Verdes Sand — 33.60°N, 117.88°WPalos Verdes Sand — 33.75°N, 118.29°WPalos Verdes Sand — 33.75°N, 118.29°WDongen — 53.16°N, 6.22°EMarnes de Donzacq — 43.75°N, 0.84°WSelsey — 50.80°N, 1.21°WCouche II — 32.85°N, 6.63°WCouche II — 32.81°N, 6.83°WCouche II — 32.65°N, 6.68°WSimferopol — 45.17°N, 34.60°EBirket Qarun — 29.28°N, 30.04°EEsbarrondadoiro — 38.17°N, 8.17°WEsbarrondadoiro — 38.11°N, 8.36°WMatam — 15.32°N, 13.03°WWittering — 51.08°N, 1.17°WWadi Esh-Shallala — 31.57°N, 37.12°EWilliamsburg — 33.43°N, 80.10°WNanjemoy — 38.28°N, 77.37°WQasr el-Sagha — 29.32°N, 30.05°ETemblor — 35.47°N, 118.91°WMarnes de Miretrain — 43.69°N, 1.13°WLodo — 36.61°N, 120.68°WKuma — 45.10°N, 34.63°EBahía Inglesa — 26.22°S, 70.72°WMiretrain Marl — 43.57°N, 1.11°WLondon Clay — 51.64°N, 0.78°ESan Pedro — 33.75°N, 118.29°WTimms Point Silt — 33.73°N, 118.28°W

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The named rock units Triakis has been recovered from, largest first. Drawn where the rock is now, not where it formed. 2 further formations hold fewer occurrences each and are not listed. 16 occurrences have no formation on record, which is common for older literature.

Triakis and its relatives

Eocene

Where Triakis and its relatives were recorded in the Eocene.

Found in the same rock

1,683 taxa

The Paleobiology Database records 54 sites for Triakis, 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

29 references

Each of the 65 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. 17 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 content3

Picture of Triakis

Credit
Mfield , Matthew Field, www.photography.mattfield.com
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

CT scan

Licence
In Copyright
Commercial use
cannot be read from the licence given — check the record
Specimen
Triakis semifasciata · MCZ:Ich:154959

3D model

Source
Sketchfab
Credit
n-
Licence
CC Attribution
Commercial use
cannot be read from the licence given — check the record

Smithsonian Open Access 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 itTriakinae through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Müller and Henle 1838