Hammatoceras

Hammatoceras is a genus of ammonites belonging to the family Hammatoceratidae which lived during the Toarcian stage of the Early/Lower Jurassic between about 184 and 175 million year ago.

Hammatoceras

Hectonichus · 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
HammatoceratidaePBDB
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 8.2 million years on record.

The record covers at least 182.9 Mya to 174.7 Mya. No occurrence read is dated outside 201.4 Mya to 161.5 Mya.

Late Triassic — about 0 of 119 occurrencesEarly Jurassic — about 81 of 119 occurrencesEarly JurassicMiddle Jurassic — about 38 of 119 occurrencesMiddle JurassicLate Jurassic — about 0 of 119 occurrences202–201 Mya — about 0.0 occurrences201–199 Mya — about 0.0 occurrences199–198 Mya — about 0.0 occurrences198–197 Mya — about 0.0 occurrences197–195 Mya — about 0.0 occurrences195–194 Mya — about 0.0 occurrences194–193 Mya — about 0.0 occurrences193–191 Mya — about 0.0 occurrences191–190 Mya — about 0.0 occurrences190–188 Mya — about 0.0 occurrences188–187 Mya — about 0.0 occurrences187–186 Mya — about 0.0 occurrences186–184 Mya — about 0.0 occurrences184–183 Mya — about 3 occurrences183–181 Mya — about 7 occurrences181–180 Mya — about 9 occurrences180–179 Mya — about 16 occurrences179–177 Mya — about 16 occurrences177–176 Mya — about 16 occurrences176–175 Mya — about 15 occurrences175–173 Mya — about 11 occurrences173–172 Mya — about 11 occurrences172–170 Mya — about 8 occurrences170–169 Mya — about 4 occurrences169–168 Mya — about 2 occurrences168–166 Mya — about 0.0 occurrences166–165 Mya — about 0.0 occurrences165–163 Mya — about 0.0 occurrences163–162 Mya — about 0.0 occurrences162–161 Mya — about 0.0 occurrences182.9 Mya174.7 Mya202.2 Mya160.7 Mya

119 occurrences of Hammatoceras 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

119 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

17 formations

Marnes de Fontaneilles — 43.85°N, 3.12°EKisgerecse — 47.70°N, 18.43°EKisgerecse — 47.70°N, 18.47°ESubbetic Basin — 37.59°N, 3.21°WSubbetic Basin — 38.13°N, 1.47°WJurensismergel — 49.91°N, 11.46°EJurensismergel — 47.95°N, 7.82°ELautaro — 29.21°S, 70.28°WLautaro — 29.36°S, 70.19°WLautaro — 28.14°S, 69.96°WLautaro — 28.16°S, 69.86°WTölgyhát — 47.70°N, 18.47°EAgoudim — 32.24°N, 4.26°WBraunjura alpha & Braunjura beta — 48.90°N, 7.67°EPhantom Creek — 53.42°N, 132.26°WMontandón — 26.54°S, 69.25°WMontandón — 26.55°S, 69.19°WWhiteaves — 53.42°N, 132.27°WOzirovo — 41.52°N, 24.67°EKef el Orma — 36.35°N, 10.07°EUpper Lias — 51.80°N, 1.88°WAdnet — 48.89°N, 19.08°EDogger — 54.42°N, 0.93°WAït Athmane — 32.07°N, 4.38°W

Loading coastlines…

The named rock units Hammatoceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 71 occurrences have no formation on record, which is common for older literature.

Hammatoceras and its relatives

Early Jurassic

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

Found in the same rock

300 taxa

The Paleobiology Database records 76 sites for Hammatoceras, 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

33 references

Each of the 119 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. 21 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 Hammatoceras

Credit
Hectonichus
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

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 itHammatoceratidae through timeFormations of the Early JurassicThe world it lived on

Occurrence data from the Paleobiology Database, CC BY 4.0.