Holcodiscus

Holcodiscus is an extinct ammonite genus placed in the family Holcodiscidae. Species in this genus were fast-moving nektonic carnivores. The type species of the genus is Ammonites caillaudianus.

Holcodiscus

Hectonichus · 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
HolcodiscidaePBDB
Diet
carnivorePBDB, for Ammonoidea
Life habit
nektonicPBDB, for Ammonoidea
Motility
fast-movingPBDB, for Ammonoidea
Vision
well-developedPBDB, for Cephalopoda
Environment
marinePBDB, for Cephalopoda

Time the record covers

At least 51 million years on record.

The record covers at least 141 Mya to 89.8 Mya. No occurrence read is dated outside 145.06 Mya to 83.6 Mya.

Late Jurassic — about 0 of 91 occurrencesEarly Cretaceous — about 89 of 91 occurrencesEarly CretaceousLate Cretaceous — about 2 of 91 occurrencesLate Cretaceous146–144 Mya — about 0.2 occurrences144–142 Mya — about 0.5 occurrences142–140 Mya — about 0.3 occurrences127–125 Mya — about 16 occurrences125–123 Mya — about 43 occurrences123–121 Mya — about 29 occurrences91–89 Mya — about 0.3 occurrences89–87 Mya — about 0.7 occurrences87–85 Mya — about 0.7 occurrences85–82 Mya — about 0.3 occurrences141 Mya89.8 Mya146 Mya82 Mya

91 occurrences of Holcodiscus 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

91 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

5 formations

Taboulouart — 30.87°N, 9.81°WTaboulouart — 30.72°N, 9.80°WTaboulouart — 30.61°N, 9.73°WSchrambach — 47.91°N, 14.35°ELuckovska — 49.03°N, 18.33°ELuckowska — 49.03°N, 18.28°EMaiolica — 45.75°N, 9.48°E

Loading coastlines…

The named rock units Holcodiscus has been recovered from, largest first. Drawn where the rock is now, not where it formed. 79 occurrences have no formation on record, which is common for older literature.

Holcodiscus and its relatives

Early Cretaceous

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

Found in the same rock

286 taxa

The Paleobiology Database records 62 sites for Holcodiscus, 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

15 references

Each of the 91 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. 3 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 content2

Picture of Holcodiscus

Credit
Hectonichus
Licence
CC BY-SA 3.0
Commercial use
the licence allows it

3D model

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

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 itHolcodiscidae through timeFormations of the Early CretaceousThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0. Uhlig 1882