Stratum.black
Douvilleiceras — Douvilleiceras
Douvilleiceras — Hectonichus, Wikimedia Commons, CC BY SA 3.0

Ammonoid

Douvilleiceras

Tractor ammonite

Douvilleiceras mammillatum is the knobbly 'tractor' ammonite of the Albian of Madagascar, France and England, with rows of tubercles along coarse ribs. Madagascan specimens with iridescent shell are cheap and impressive; the tubercles are frequently touched up with paint and whole shells may be resin-coated. It is a fine companion to Cleoniceras.

PhylumMollusca
ClassCephalopoda
OrderAmmonitida
FamilyDouvilleiceratidae
GroupAmmonoid
Rank (PBDB)genus· Paleobiology Database
AuthorGrossouvre 1894· Paleobiology Database
Classification (PBDB)Mollusca › Cephalopoda › Ammonitida › Douvilleiceratidae· Paleobiology Database
Range (PBDB)126–89.8 Ma· Paleobiology Database
PBDB occurrences202· Paleobiology Database

Photographs

Douvilleiceras — Douvilleiceras mammillatum (NHMUK PI C 72310)
Douvilleiceras mammillatum (NHMUK PI C 72310) — © The Trustees of the Natural History Museum, London, Natural History Museum (London) Data Portal, CC BY 4.0
Douvilleiceras — Douvilleiceras mammillatum (NHMUK PI C 3670)
Douvilleiceras mammillatum (NHMUK PI C 3670) — © The Trustees of the Natural History Museum, London, Natural History Museum (London) Data Portal, CC BY 4.0
Douvilleiceras — Douvilleiceras mammillatum (NHMUK PI C 72313)
Douvilleiceras mammillatum (NHMUK PI C 72313) — © The Trustees of the Natural History Museum, London, Natural History Museum (London) Data Portal, CC BY 4.0

Age

Elsewhere

Cite this article

Stratum Study. "Douvilleiceras" (Taxon). Stratum Study pack 2026.09, as of 2026-09-19. https://stratum.black/study/taxa/douvilleiceras. Accessed 2026-09-20.

BibTeX · CSL-JSON

@misc{stratum-douvilleiceras,
  title        = {Douvilleiceras},
  author       = {{Stratum Study}},
  howpublished = {\url{https://stratum.black/study/taxa/douvilleiceras}},
  year         = {2026},
  note         = {Taxon article, Stratum Study pack 2026.09, as of 2026-09-19; sources: stratum, pbdb, wikidata, commons, nhm. Accessed 2026-09-20.}
}

Citations carry the pack version and the article's as-of date so they resolve to the same text later. The facts themselves belong to the sources listed below; cite those for the science.