Heteroptychodus

Heteroptychodus is an extinct genus of hybodont that lived in Asia during the Early Cretaceous period. It had low, rounded durophagous teeth that are covered in ridges. Species have been reported from Japan, Mongolia, Malaysia, Thailand, Southern China, and possibly Kyrgyzstan. Fossils have been found in freshwater environments.

Heteroptychodus

Cuny, Gilles · CC BY 4.0 · via GBIF. 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
HybodontinaePBDB
Diet
carnivorePBDB, for Chondrichthyes
Life habit
nektonicPBDB, for Chondrichthyes
Motility
actively mobilePBDB, for Chondrichthyes

Time the record covers

At least 15 million years on record.

The record covers at least 137.05 Mya to 121.4 Mya. No occurrence read is dated outside 149.2 Mya to 100.5 Mya.

Late Jurassic — about 1 of 17 occurrencesLate JurassicEarly Cretaceous — about 17 of 17 occurrencesEarly CretaceousLate Cretaceous — about 0 of 17 occurrences150–148 Mya — about 0.1 occurrences148–147 Mya — about 0.1 occurrences147–145 Mya — about 0.1 occurrences145–143 Mya — about 0.1 occurrences143–142 Mya — about 0.2 occurrences142–140 Mya — about 0.2 occurrences140–138 Mya — about 0.2 occurrences138–137 Mya — about 0.2 occurrences137–135 Mya — about 0.1 occurrences135–133 Mya — about 0.1 occurrences133–132 Mya — about 0.1 occurrences132–130 Mya — about 0.1 occurrences130–128 Mya — about 0.1 occurrences128–127 Mya — about 0.1 occurrences127–125 Mya — about 2 occurrences125–123 Mya — about 3 occurrences123–121 Mya — about 3 occurrences121–120 Mya — about 0.8 occurrences120–118 Mya — about 0.7 occurrences118–116 Mya — about 0.7 occurrences116–115 Mya — about 0.7 occurrences115–113 Mya — about 0.7 occurrences113–111 Mya — about 0.5 occurrences111–110 Mya — about 0.5 occurrences110–108 Mya — about 0.5 occurrences108–106 Mya — about 0.5 occurrences106–105 Mya — about 0.5 occurrences105–103 Mya — about 0.5 occurrences103–101 Mya — about 0.5 occurrences101–100 Mya — about 0.2 occurrences137.05 Mya121.4 Mya150 Mya100 Mya

17 occurrences of Heteroptychodus on record, most of them in the Early 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

17 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

7 formations

Sao Khua — 16.89°N, 104.08°ESao Khua — 11.56°N, 102.59°ESao Khua — 17.10°N, 102.49°ESao Khua — 16.86°N, 104.48°ESao Khua — 17.07°N, 104.16°ESao Khua — 16.90°N, 102.65°EKhok Kruat — 15.23°N, 104.86°EKhok Kruat — 14.87°N, 102.73°EKhok Kruat — 16.54°N, 102.85°EKhok Kruat — 16.60°N, 103.52°EKhok Kruat — 15.76°N, 101.77°EKamo — 34.48°N, 136.85°EPhu Kradung — 16.27°N, 104.43°ESebayashi — 36.07°N, 138.83°ETemus Shale — 3.24°N, 102.94°EKhoh Kruat — 16.94°N, 102.46°E

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The named rock units Heteroptychodus has been recovered from, largest first. Drawn where the rock is now, not where it formed.

Heteroptychodus and its relatives

Early Cretaceous

Where Heteroptychodus and its relatives were recorded in the Early Cretaceous.

Found in the same rock

86 taxa

The Paleobiology Database records 16 sites for Heteroptychodus, 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

13 references

Each of the 17 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. 1 further reference is 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 Heteroptychodus

Source
GBIF
Credit
Cuny, Gilles
Licence
CC BY 4.0
Commercial use
the licence allows it

No 3D scan of Heteroptychodus 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 itHybodontinae through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Yabe and Obata 1930