Hildoceras

Hildoceras is a genus of ammonite from the Jurassic period in the family Hildoceratidae. The shells are characterized by a narrow discoidal evolute shape, keeled venter, concave ribs along the outer flanks, and a shallow spiral groove running along smooth inner flanks. Whorls slightly overlap, cross sections are compressed. The ventral keel is bordered on either side by a shallow groove. The genus was named by Alpheus Hyatt after Saint Hilda in 1876.

Hildoceras

Francisco Ruiz Contreras · CC BY-SA 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
HildoceratinaePBDB
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 1.3 million years on record.

The record covers at least 184.2 Mya to 182.9 Mya. No occurrence read is dated outside 192.9 Mya to 174.7 Mya.

Early Jurassic — about 577 of 577 occurrencesEarly JurassicMiddle Jurassic — about 0 of 577 occurrences193–193 Mya — about 0.0 occurrences193–192 Mya — about 0.1 occurrences192–191 Mya — about 0.1 occurrences191–191 Mya — about 0.1 occurrences191–190 Mya — about 0.1 occurrences190–190 Mya — about 0.1 occurrences190–189 Mya — about 0.1 occurrences189–188 Mya — about 0.1 occurrences188–188 Mya — about 0.1 occurrences188–187 Mya — about 0.1 occurrences187–186 Mya — about 0.1 occurrences186–186 Mya — about 0.1 occurrences186–185 Mya — about 0.1 occurrences185–184 Mya — about 0.1 occurrences184–184 Mya — about 5 occurrences184–183 Mya — about 7 occurrences183–183 Mya — about 37 occurrences183–182 Mya — about 57 occurrences182–181 Mya — about 57 occurrences181–181 Mya — about 57 occurrences181–180 Mya — about 44 occurrences180–179 Mya — about 38 occurrences179–179 Mya — about 38 occurrences179–178 Mya — about 38 occurrences178–177 Mya — about 38 occurrences177–177 Mya — about 38 occurrences177–176 Mya — about 38 occurrences176–175 Mya — about 38 occurrences175–175 Mya — about 38 occurrences175–174 Mya — about 8 occurrences184.2 Mya – 182.9 Mya193.4 Mya174.2 Mya

577 occurrences of Hildoceras 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

577 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

21 formations

Subbetic Basin — 37.59°N, 3.21°WSubbetic Basin — 38.06°N, 3.26°WSubbetic Basin — 38.13°N, 1.47°WBugarone — 43.33°N, 13.22°EAlum Shale — 54.49°N, 0.60°WAlum Shale — 54.40°N, 0.47°WKisgerecse Marl — 47.70°N, 18.49°ECamino — 43.05°N, 4.07°WCastillo Pedros — 42.89°N, 3.98°WKisgerecse — 47.70°N, 18.43°EKisgerecse — 47.66°N, 18.47°EStaa — 35.11°N, 9.68°EStaa — 36.38°N, 10.13°EStaa — 36.35°N, 10.07°EMarnes de Fontaneilles — 43.85°N, 3.12°EChâabet El Attaris — 35.10°N, 9.71°EAmergou — 34.50°N, 5.13°WAït Athmane — 32.07°N, 4.38°WOzirovo — 42.89°N, 24.28°EOzirovo — 42.86°N, 26.42°EOzirovo — 43.08°N, 23.23°EUpper Lias — 51.80°N, 1.88°WNishinakayama — 34.25°N, 131.00°EPosidonienschiefer — 49.91°N, 11.46°EPosidonienschiefer — 49.35°N, 11.36°EJurensismergel — 48.83°N, 10.10°ESchistes Cartons — 43.85°N, 3.12°EAdnet — 48.89°N, 19.08°EAdnet — 47.46°N, 13.56°EAgoudim — 31.95°N, 5.04°W

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The named rock units Hildoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 225 occurrences have no formation on record, which is common for older literature.

Hildoceras and its relatives

Early Jurassic

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

Found in the same rock

166 taxa

The Paleobiology Database records 325 sites for Hildoceras, and this reads 240 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

37 references

Each of the 577 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. 25 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 Hildoceras

Credit
Francisco Ruiz Contreras
Licence
CC BY-SA 4.0
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 itHildoceratinae through timeFormations of the Early JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.