Triakidae

The Triakidae or houndsharks are a family of ground sharks, consisting of about 40 species in nine genera. In some classifications, the family is split into two subfamilies, with the genera Mustelus, Scylliogaleus and Triakis in the subfamily Triakinae, and the remainders in the subfamily Galeorhininae.

Triakidae

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
Also called
hound sharkPBDB
Sits inside
CarcharhiniformesPBDB
Diet
carnivorePBDB, for Carcharhiniformes
Life habit
nektonicPBDB, for Carcharhiniformes
Motility
actively mobilePBDB, for Carcharhiniformes

Time the record covers

At least 125 million years on record.

The record covers at least 125.77 Mya to 11.7 ka. No occurrence read is dated outside 132.6 Mya to 0 Mya.

Early Cretaceous — about 1 of 602 occurrencesEarly CretaceousLate Cretaceous — about 137 of 602 occurrencesLate CretaceousPaleocene — about 109 of 602 occurrencesEocene — about 224 of 602 occurrencesEoceneOligocene — about 9 of 602 occurrencesMiocene — about 76 of 602 occurrencesMiocenePliocene — about 20 of 602 occurrencesPleistocene — about 21 of 602 occurrences135–131 Mya — about 0.3 occurrences131–126 Mya — about 0.7 occurrences126–122 Mya — about 0.1 occurrences95–90 Mya — about 3 occurrences90–86 Mya — about 0.6 occurrences86–81 Mya — about 27 occurrences81–77 Mya — about 22 occurrences77–72 Mya — about 23 occurrences72–68 Mya — about 45 occurrences68–63 Mya — about 54 occurrences63–59 Mya — about 37 occurrences59–54 Mya — about 53 occurrences54–50 Mya — about 44 occurrences50–45 Mya — about 52 occurrences45–41 Mya — about 54 occurrences41–36 Mya — about 38 occurrences36–32 Mya — about 20 occurrences32–27 Mya — about 4 occurrences27–23 Mya — about 3 occurrences23–18 Mya — about 8 occurrences18–14 Mya — about 16 occurrences14–9.0 Mya — about 26 occurrences9.0–4.5 Mya — about 32 occurrences4.5–0 Mya — about 39 occurrences125.77 Mya11.7 ka135 Mya0 Mya

602 occurrences of Triakidae 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

602 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

151 formations

Marnes de Donzacq — 43.75°N, 0.84°WFox Hills — 46.26°N, 100.55°WFox Hills — 46.05°N, 103.88°WFox Hills — 46.47°N, 99.58°WFox Hills — 44.52°N, 102.39°WNewhaven Chalk — 51.45°N, 1.36°WNewhaven Chalk — 50.88°N, 0.81°WNewhaven Chalk — 51.53°N, 0.70°WNewhaven Chalk — 50.67°N, 1.10°WCouche II — 32.65°N, 6.68°WCouche II — 32.72°N, 6.78°WCouche II — 32.85°N, 6.63°WCouche II — 32.81°N, 6.83°WPalos Verdes Sand — 33.76°N, 118.29°WPalos 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°WLondon Clay — 51.40°N, 0.83°ELondon Clay — 51.51°N, 0.24°ELondon Clay — 51.38°N, 0.24°WLondon Clay — 50.78°N, 0.65°WLondon Clay — 50.88°N, 1.30°WLondon Clay — 51.64°N, 0.78°ESables de Bracheux — 49.58°N, 2.65°ESables de Bracheux — 49.53°N, 2.75°ESelsey — 50.80°N, 1.21°WMarnes de Miretrain — 43.69°N, 1.13°WTuffeau de St-Omer — 50.53°N, 3.15°ETuffeau de St-Omer — 50.44°N, 3.07°EGehannam — 29.33°N, 30.08°EGehannam — 29.30°N, 30.05°EEsbarrondadoiro — 38.17°N, 8.17°WEsbarrondadoiro — 38.11°N, 8.36°WEsbarrondadoiro — 39.30°N, 8.12°WLa Meseta — 64.23°S, 56.67°WTallahatta — 31.31°N, 88.73°WTallahatta — 31.57°N, 88.34°WTallahatta — 31.79°N, 88.32°WTallahatta — 31.37°N, 86.52°WDongen — 52.73°N, 6.30°EDongen — 53.16°N, 6.22°ESimferopol — 45.17°N, 34.60°ESimferopol — 45.11°N, 34.70°EMesaverde — 44.08°N, 107.73°WMesaverde — 44.11°N, 107.76°WBahía Inglesa — 27.13°S, 70.83°WBahía Inglesa — 26.22°S, 70.72°WBahía Inglesa — 27.16°S, 70.89°WRødvig — 55.32°N, 12.44°EKortrijk Clay — 50.80°N, 3.22°EChucunaque — 9.13°N, 78.75°WKuma — 45.10°N, 34.63°EArenas de Huelva — 37.35°N, 6.61°WArenas de Huelva — 37.33°N, 6.68°WArenas de Huelva — 37.22°N, 7.10°WYazoo — 31.82°N, 92.33°WYazoo — 31.71°N, 87.96°WYazoo — 31.93°N, 91.94°WYazoo — 31.66°N, 92.90°W

Loading coastlines…

The named rock units Triakidae has been recovered from, largest first. Drawn where the rock is now, not where it formed. 127 further formations hold fewer occurrences each and are not listed. 176 occurrences have no formation on record, which is common for older literature.

Triakidae and its relatives

Eocene

Where Triakidae and its relatives were recorded in the Eocene.

Found in the same rock

3,583 taxa

The Paleobiology Database records 365 sites for Triakidae, and this reads 240 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

197 references

Each of the 602 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. 185 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 Triakidae

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

No 3D scan of Triakidae was found in MorphoSource and Sketchfab.

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 itCarcharhiniformes through timeFormations of the EoceneThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Gray 1851