Holasteroida
Holasteroida is an order of irregular sea urchins.

Alexander Ziegler, Cornelius Faber, Susanne Mueller &and Thomas Bartolomaeus (published as Creative Commons Attributi… · 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
- AtelostomataPBDB
- Diet
- detritivorePBDB
- Life habit
- semi-infaunalPBDB
- Motility
- actively mobilePBDB
- Vision
- limitedPBDB, for Echinoidea
- Environment
- marinePBDB
Time the record covers
At least 114 million years on record.
The record covers at least 137.05 Mya to 23.04 Mya. No occurrence read is dated outside 143.1 Mya to 11.63 Mya.
664 occurrences of Holasteroida on record, most of them in the Late Cretaceous. The Paleobiology Database records this as a living group, and the chart stops with its fossils rather than at the present. 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
664 occurrences- Early Cretaceous29%
- Late Cretaceous63%
- Paleocene6%
- Eoceneunder 1%
- Oligoceneunder 1%
- Mioceneunder 1%
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
103 formations
- Calcaires à Spatangues Formation92
- Grès verts helvétiques Formation33
- Gulpen Formation23
- Cabo de Lata Formation23
- Olazagutia Formation22
- Ahlen Formation20
Loading coastlines…
The named rock units Holasteroida has been recovered from, largest first. Drawn where the rock is now, not where it formed. 79 further formations hold fewer occurrences each and are not listed. 191 occurrences have no formation on record, which is common for older literature.
Holasteroida and its relatives
Late CretaceousWhere Holasteroida and its relatives were recorded in the Late Cretaceous.
Found in the same rock
1,525 taxa- Holaster127 sites
- Hemiaster49 sites
- Toxaster retusus47 sites
- Discoides30 sites
- Phyllobrissus gresslyi29 sites
- Echinocorys25 sites
- Catopygus24 sites
- Echinogalerus24 sites
- Conulus19 sites
- Micraster glyphus19 sites
- Salenia19 sites
- Temnocidaris (Stereocidaris)19 sites
- Echinocorys ovatus18 sites
- Echinoidea18 sites
- Hoploscaphites18 sites
- Hysteroceras18 sites
- Toxaster18 sites
- Belemnitella mucronata17 sites
- Cataceramus balticus17 sites
- Hemipneustes striatoradiatus17 sites
- Micraster17 sites
- Serpula17 sites
- Tetragramma variolare17 sites
- Anisoceras16 sites
The Paleobiology Database records 474 sites for Holasteroida, and this reads 240 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
102 references- La variation chez les échinides irréguliers. Dimensions ontogénétiques, écologiques, évolutives92
- Les grès verts helvétiques (Aptien moyen-Albien supérieur) de Haute-Savoie, Valais et Vaud (Alpes occidentales franco-suisses)63
- Late Cretaceous-Early Paleocene echinoderms and the K/T boundary in the southeast Netherlands and the northeast Belgium. - part 4: Echinoids45
- American Upper Cretaceous Echinoidea35
- Macrofauna of the Cantera de Margas section, Olazagutia: Coniacian/Santonian boundary, Navarro-Cantabrian Basin, northern Spain24
- Jura Vaudois et Neuchatelois24
- Late Cretaceous-early Tertiary echinoids from northern Spain: implications for the Cretaceous-Tertiary extinction event23
- Coniacian-Maastrichtian of the Tremp Area (South Central Pyrenees)23
- Djabarov, 196422
- Die Großfauna der Mukronatenkreide (unteres Obercampan) im östlichen Münsterland20
- Cenomanian and Lower Turonian echinoderms from Wilmington, south-east Devon, England19
- Rare Campanian echinoids from the Höver and Misburg (Hannover area, Lower Saxony, Germany)13
Each of the 664 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. 90 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 Holasteroida
- Source
- Wikipedia/Commons
- Credit
- Alexander Ziegler, Cornelius Faber, Susanne Mueller &and Thomas Bartolomaeus (published as Creative Commons Attributi…
- Licence
- CC BY-SA 4.0
- Commercial use
- the licence allows it
No 3D scan of Holasteroida 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
- 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 itAtelostomata through timeFormations of the Late CretaceousThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Durham and Melville 1957