Pelmatozoa
Pelmatozoa was once a clade of Phylum Echinodermata. It included stalked and sedentary echinoderms. The main class of Pelmatozoa were the Crinoidea which includes sea lily and feather star.

albert kok · CC BY-SA 3.0 · via Wikidata/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
- EchinodermataPBDB
- Environment
- marinePBDB, for Echinodermata
Time the record covers
At least 206 million years on record.
The record covers at least 509.7 Mya to 303.7 Mya. No occurrence read is dated outside 538.8 Mya to 298.9 Mya.
124 occurrences of Pelmatozoa on record, most of them in the Ordovician. 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
124 occurrences- Cambrian20%
- Ordovician60%
- Silurian6%
- Devonian7%
- Carboniferous6%
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
52 formations
- Wenallt Formation17
- Chatsworth Formation15
- Badger Flat Formation4
- Mattoon Formation4
- Shin Brook Formation4
- Tumugol Formation4
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The named rock units Pelmatozoa has been recovered from, largest first. Drawn where the rock is now, not where it formed. 28 further formations hold fewer occurrences each and are not listed. 18 occurrences have no formation on record, which is common for older literature.
Pelmatozoa and its relatives
OrdovicianWhere Pelmatozoa and its relatives were recorded in the Ordovician.
Found in the same rock
1,023 taxa- Cystoidea59 sites
- Crinoidea31 sites
- Bryozoa30 sites
- Brachiopoda24 sites
- Gastropoda22 sites
- Trepostomata20 sites
- Dalmanellidae16 sites
- Leptaena16 sites
- Cryptostomata13 sites
- Ostracoda13 sites
- Trilobita11 sites
- Bivalvia10 sites
- Eostropheodonta hirnantensis10 sites
- Maladioidella doylei10 sites
- Palaeocopida10 sites
- Rugosa10 sites
- Dalmanella9 sites
- Glyptorthis9 sites
- Hindella9 sites
- Orthambonites9 sites
- Orthoidea9 sites
- Strophomenoidea9 sites
- Wentsuia iota9 sites
- Cornulites8 sites
The Paleobiology Database records 111 sites for Pelmatozoa, and this reads all 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
53 references- The Ordovician-Silurian boundary in the Garth area of southwest Powys, Wales25
- Late Cambrian trilobites from the Chatsworth Limestone, western Queensland15
- Species diversity patterns in some middle Ordovician communities from California-Nevada5
- Morphometric analysis of Tremadocian (earliest Ordovician) kirkocystid mitrates (Echinodermata, Stylophora) from the Taebaeksan Basin, Korea4
- Brachiopods of the suborder Strophomenidina from the Shumway Cyclothem, Mattoon Formation, Virgilian of Illinois.4
- Geology of the Bristol and Wallace quadrangles, Virginia4
- Fossils in the Ordovician Tuffs Northeastern Maine, with a section on Trilobita by Harry B. Whittington4
- Epizoan-sponge Interactions in the Early Ordovician of the Argentine Precordillera3
- Chlupáč et al., 19983
- The brachiopods of the Duncannon Group (Middle-Upper Ordovician) of southeast Ireland3
- Middle Cambrian cystoid (sensu lato) stem columnals from Bornholm, Denmark3
- Phosphatic stromatoporoid sponges formed reefs ~480 Mya2
Each of the 124 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. 41 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 Pelmatozoa
- Source
- Wikidata/Commons
- Credit
- albert kok
- Licence
- CC BY-SA 3.0
- Commercial use
- the licence allows it
No 3D scan of Pelmatozoa was found in MorphoSource and Sketchfab.
Smithsonian Open Access was not reached for this taxon, so this list is what the others held rather than everything there is.
The description on this site
- Source
- Wikipedia, “Pelmatozoa”
- 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 itEchinodermata through timeFormations of the OrdovicianThe world it lived on
Occurrence data from the Paleobiology Database, CC BY 4.0. Leuckart 1848