Ammonoid
Perisphinctes
Ribbed ammonite
Perisphinctes is the evolute, evenly ribbed Oxfordian ammonite of Madagascar, England and France; Madagascan Perisphinctes with their limestone matrix and ribbed shells are the standard 'Jurassic ammonite' of gift shops. Large specimens (20 cm and up) are polished across one face to show the chambers. Many 'Perisphinctes' are other perisphinctids, but the name works as a trade label.
| Phylum | Mollusca |
|---|---|
| Class | Cephalopoda |
| Order | Ammonitida |
| Family | Perisphinctidae |
| Group | Ammonoid |
| Rank (PBDB) | genus· Paleobiology Database |
| Author | (Waagen 1869)· Paleobiology Database |
| Classification (PBDB) | Mollusca › Cephalopoda › Ammonitida › Perisphinctidae· Paleobiology Database |
| Range (PBDB) | 165–141 Ma· Paleobiology Database |
| PBDB occurrences | 495· Paleobiology Database |
Elsewhere
- GBIF: 4626104
- PBDB: 15382
- Wikidata: Q3899935
- PBDB taxon page
- Wikipedia: Perisphinctes
- PBDB search: Perisphinctes
Cite this article
Stratum Strata. "Perisphinctes" (Taxon). Stratum Strata pack 2026.09, as of 2026-09-21. https://stratum.black/strata/taxa/perisphinctes. Accessed 2026-09-21.
@misc{stratum-perisphinctes,
title = {Perisphinctes},
author = {{Stratum Strata}},
howpublished = {\url{https://stratum.black/strata/taxa/perisphinctes}},
year = {2026},
note = {Taxon article, Stratum Strata pack 2026.09, as of 2026-09-21; sources: stratum, pbdb, wikidata, commons. Accessed 2026-09-21.}
} 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.