Acanthopleuroceras
Searched as Cycloceras. The Paleobiology Database treats Acanthopleuroceras as the accepted name.
Cycloceras is an extinct nautiloid cephalopod genus from the Carboniferous of Western Europe, of unknown affinity with the Orthocerida.

Ghedoghedo · 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
- TropidoceratinaePBDB
- 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 278 million years on record.
The record covers at least 468 Mya to 189.2 Mya. No occurrence read is dated outside 477.1 Mya to 174.7 Mya.
195 occurrences of Acanthopleuroceras 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
195 occurrences- Ordovician6%
- Silurian1%
- Devonianunder 1%
- Carboniferous7%
- Permian2%
- Early Jurassic84%
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
33 formations
- Fannin Formation · Maude Group19
- Ghost Creek Formation · Maude Group12
- Inklin Formation · Laberge Group10
- Belemnite Marls Formation8
- Sunrise Formation5
- Chikunsan Formation3
Loading coastlines…
The named rock units Acanthopleuroceras has been recovered from, largest first. Drawn where the rock is now, not where it formed. 9 further formations hold fewer occurrences each and are not listed. 101 occurrences have no formation on record, which is common for older literature.
Acanthopleuroceras and its relatives
Early JurassicWhere Acanthopleuroceras and its relatives were recorded in the Early Jurassic.
Found in the same rock
216 taxa- Tragophylloceras ibex17 sites
- Lytoceras fimbriatum15 sites
- Tragophylloceras undulatum14 sites
- Tropidoceras12 sites
- Tropidoceras masseanum12 sites
- Tropidoceras flandrini10 sites
- Tropidoceras actaeon9 sites
- Liparoceras8 sites
- Metaderoceras talkeetnaense6 sites
- Derolytoceras tortum5 sites
- Dubariceras silviesi5 sites
- Liparoceras (Liparoceras)5 sites
- Metaderoceras gemmellaroi evolutum5 sites
- Parainoceramya ventricosa5 sites
- Dubariceras freboldi4 sites
- Metaderoceras mouterdei4 sites
- Phylloceras4 sites
- Tragophylloceras loscombi4 sites
- Fuciniceras3 sites
- Gastropoda3 sites
- Gemmellaroceras aenigmaticum3 sites
- Juraphyllites3 sites
- Liparoceras striatum3 sites
- Lytoceras3 sites
The Paleobiology Database records 121 sites for Acanthopleuroceras, 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
42 references- Les ammonites du Carixien des Causses (France)84
- Pliensbachian (Lower Jurassic) ammonites of the Queen Charlotte Islands, British Columbia32
- The Belemnite marls of Charmouth, a series in the Lias of the Dorset Coast8
- Pliensbachian–Toarcian (Early Jurassic) Ammonoids from the Luning Embayment, West-Central Nevada, U.S.A.5
- Early Jurassic Bivalvia of western Canada. Part I. Subclasses Palaeotaxodonta, Pteriomorpha, and Isofilibranchia5
- Early Jurassic evolution of the northern Stikinian arc: evidence from the Laberge Group, northwestern British Columbia5
- Provenance Constraints on Early Jurassic Evolution of the Northern Stikinian Arc: Laberge Group, Whitehorse Trough, Northwestern British Columbia5
- El Jurasico Inferior en la seccion de Almonacid de la Cuba (sector central de la Cordillera Iberica, Zaragoza, Espana) [Lower Jurassic at the Almonacid de la Cuba section (central sector of the Iberian Range, Zaragoza, Spain)]3
- The Liassic Ammonite Faunas of the Stowell Park Borehole3
- The Cambro-Ordovician formations and faunas of south Chosen. Paleontology. Part I. Middle Ordovician faunas3
- Austroalpine Liassic ammonites from Vorarlberg (Austria, Northern Calcareous Alps)2
- Regional Stratigraphic Table of North China2
Each of the 195 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. 30 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 content1
Picture of Acanthopleuroceras
- Source
- Wikipedia/Commons
- Credit
- Ghedoghedo
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
No 3D scan of Acanthopleuroceras 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
- Source
- Wikipedia, “Cycloceras”
- 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 itTropidoceratinae through timeFormations of the Early JurassicThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Hyatt 1867