Paracestracion

Paracestracion is an extinct genus of heterodontiform sharks from Early Jurassic to Early Cretaceous-aged rocks of England, France, Germany and Luxembourg. The genus was first described in 1911 by Ernst Hermann Friedrich von Koken in Karl Alfred von Zittel.

Paracestracion

Villalobos-Segura, E.; Stumpf, S.; Türtscher, J.; Jambura, P.L.; Begat, A.; López-Romero, F.A.; Fischer, J.; Kriwet, J. · CC BY 4.0 · 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
HeterodontidaePBDB
Diet
carnivorePBDB, for Chondrichthyes
Life habit
nektonicPBDB, for Chondrichthyes
Motility
actively mobilePBDB, for Chondrichthyes

Time the record covers

At least 45 million years on record.

The record covers at least 182.9 Mya to 137.05 Mya. No occurrence read is dated outside 184.2 Mya to 132.6 Mya.

Early Jurassic — about 6 of 12 occurrencesEarly JurassicMiddle Jurassic — about 3 of 12 occurrencesMiddle JurassicLate Jurassic — about 2 of 12 occurrencesLate JurassicEarly Cretaceous — about 1 of 12 occurrencesEarly Cretaceous185–183 Mya — about 0.6 occurrences183–182 Mya — about 0.7 occurrences182–180 Mya — about 0.7 occurrences180–178 Mya — about 1 occurrence178–176 Mya — about 1 occurrence176–174 Mya — about 1 occurrence174–173 Mya — about 0.5 occurrences173–171 Mya — about 0.5 occurrences171–169 Mya — about 0.8 occurrences169–167 Mya — about 0.5 occurrences167–166 Mya — about 0.6 occurrences166–164 Mya — about 0.1 occurrences153–151 Mya — about 0.5 occurrences151–149 Mya — about 0.8 occurrences149–148 Mya — about 0.3 occurrences148–146 Mya — about 0.3 occurrences146–144 Mya — about 0.1 occurrences139–137 Mya — about 0.0 occurrences137–135 Mya — about 0.4 occurrences135–133 Mya — about 0.4 occurrences133–132 Mya — about 0.2 occurrences182.9 Mya137.05 Mya185 Mya132 Mya

12 occurrences of Paracestracion on record, most of them in the Early Jurassic. 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

12 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

4 formations

Painten — 48.92°N, 11.58°EForest Marble — 51.85°N, 0.10°WKimmeridge Clay — 50.63°N, 2.34°WMarnes sableuses d'Audun-le-Tiche — 49.45°N, 6.00°E

Loading coastlines…

The named rock units Paracestracion has been recovered from, largest first. Drawn where the rock is now, not where it formed. 8 occurrences have no formation on record, which is common for older literature.

Paracestracion and its relatives

Early Jurassic

Where Paracestracion and its relatives were recorded in the Early Jurassic.

Found in the same rock

183 taxa

The Paleobiology Database records 12 sites for Paracestracion, 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

8 references

Each of the 12 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 Paracestracion

Credit
Villalobos-Segura, E.; Stumpf, S.; Türtscher, J.; Jambura, P.L.; Begat, A.; López-Romero, F.A.; Fischer, J.; Kriwet, J.
Licence
CC BY 4.0
Commercial use
the licence allows it

No 3D scan of Paracestracion 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 itHeterodontidae through timeFormations of the Early JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Koken in Zittel 1911