Crinoid
Seirocrinus subangularis
Colonial crinoid
Seirocrinus subangularis is the giant pseudoplanktonic crinoid of the Holzmaden Posidonia Shale, whose colonies with stems up to 20 m hung from driftwood logs and sank together. The Hauff Museum's colony is the largest fossil slab in the world; commercial slabs range from single crowns to multi-metre wall pieces. Slabs are backed, edged and consolidated, and the stems frequently have gaps filled; ask what percentage is original.
| Phylum | Echinodermata |
|---|---|
| Class | Crinoidea |
| Order | Isocrinida |
| Family | Pentacrinitidae |
| Group | Crinoid |
| Rank (PBDB) | genus· Paleobiology Database |
| Author | Gislen 1924· Paleobiology Database |
| Classification (PBDB) | Echinodermata › Crinoidea › Isocrinida › Pentacrinitidae· Paleobiology Database |
| Range (PBDB) | 201–183 Ma· Paleobiology Database |
| PBDB occurrences | 12· Paleobiology Database |
Photographs
Elsewhere
- GBIF: 4873855
- PBDB: 32624
- Wikidata: Q16294615
- PBDB taxon page
- Wikipedia: Seirocrinus
- PBDB search: Seirocrinus
Cite this article
Stratum Strata. "Seirocrinus subangularis" (Taxon). Stratum Strata pack 2026.09, as of 2026-09-21. https://stratum.black/strata/taxa/seirocrinus-subangularis. Accessed 2026-09-21.
@misc{stratum-seirocrinus-subangularis,
title = {Seirocrinus subangularis},
author = {{Stratum Strata}},
howpublished = {\url{https://stratum.black/strata/taxa/seirocrinus-subangularis}},
year = {2026},
note = {Taxon article, Stratum Strata pack 2026.09, as of 2026-09-21; sources: stratum, pbdb, wikidata, commons, nhm. 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.