Trilobite

Flexicalymene

Ordovician calymenid

Flexicalymene is the Late Ordovician calymenid of the Cincinnatian and of the Moroccan Ktaoua Formation; F. meeki and F. retrorsa from Ohio are found prone and enrolled in shale and are the classic American beginner's trilobite. Moroccan Flexicalymene ouzregui are sold by the box and are the world's most-faked trilobite: identical cast copies with 'matrix' of the same resin. Genuine Ohio specimens on grey shale are cheap, honest and locally collectible.

Phylum	Arthropoda
Class	Trilobita
Order	Phacopida
Family	Calymenidae
Group	Trilobite
Rank (PBDB)	genus· Paleobiology Database
Author	Shirley 1936· Paleobiology Database
Classification (PBDB)	Arthropoda › Trilobita › Phacopida › Calymenidae· Paleobiology Database
Range (PBDB)	471–423 Ma· Paleobiology Database
PBDB occurrences	799· Paleobiology Database

Photographs

Flexicalymene — Flexicalymene ouzregui (NHMUK PI In 66465) — Flexicalymene ouzregui (NHMUK PI In 66465) — © The Trustees of the Natural History Museum, London, Natural History Museum (London) Data Portal, CC BY 4.0

Elsewhere

Cite this article

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

BibTeX · CSL-JSON

@misc{stratum-flexicalymene,
  title        = {Flexicalymene},
  author       = {{Stratum Study}},
  howpublished = {\url{https://stratum.black/study/taxa/flexicalymene}},
  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.

Photographs

Age

Formations

Elsewhere