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| fossil_range = {{fossilrange|Silurian|Early Devonian}} ...[[genus]] of [[crinoid]]s that lived from the [[Silurian]] to the Early [[Devonian]] in [[North America]]. ...

Like most echinoderms, blastoids were protected by a set of interlocking plates of [[calcium carb [[File:Hyperoblastus.jpg|thumb|left|The Middle [[Devonian]] blastoid ''Hyperoblastus'' from the [[Milwaukee Formation]]; [[Wisconsin] ...

...tle = Early Palaeozoic palaeobiogeography and palaeoecology of stylophoran echinoderms | journal = Palaeogeography, Palaeoclimatology, Palaeoecology| last1 = Le Historically the group has been assigned to the echinoderms, barnacles, annelids and mollusks. Relationships to other Cambrian forms ( ...

| period = Devonian The '''Hunsrück Slate''' ({{langx|de|Hunsrück-Schiefer}}) is a Lower [[Devonian]] [[lithostratigraphy|lithostratigraphic]] unit, a type of [[stratum|rock s ...

...own animal-derived macrofossils include [[trilobite]]s, [[crustacean]]s, [[echinoderms]], [[brachiopod]]s, [[mollusk]]s, [[bony fish]]es, [[shark]]s, [[Vertebrate ...Many believe vertebrates diverged from a common ancestor of chordates and echinoderms. This belief is well supported by the prehistoric marine creature Amphioxus ...

...le]]s and a mechanism for transmitting muscular forces as in chordates and echinoderms, which provides a means of [[animal locomotion|locomotion]]. ...h [[aquatic ecosystem|aquatic]] and [[terrestrial ecosystem]]s since the [[Devonian]] (circa. 420-359 [[million years ago|Mya]]). ...

...ty between the primitive forests and high diversity of fishes at the end [[Devonian]] and more modern aquatic and terrestrial assemblages of the early Carbonif | title = End-Devonian extinction and a bottleneck in the early evolution of modern jawed vertebra ...

...=February 2000|title=The distribution, relative abundance and diversity of echinoderms in the eastern English Channel, Bristol Channel, and Irish Sea|journal=Jour ...on of the rocks exposed at the Eddystone Rocks was during the end of the [[Devonian]] period, but their highly [[Metamorphic rock|metamorphosed]] state indicat ...

{{Short description|Class of echinoderms}} ...>{{cite book|author1=O'Hara, Timothy|author2=Byrne, Maria|title=Australian Echinoderms: Biology, Ecology and Evolution |url=https://books.google.com/books?id=Etkq ...

{{Short description|Class of echinoderms, marine animal}} ...last1=Lacalli|first=T|year=2023|title=A radical evolutionary makeover gave echinoderms their unusual body plan|journal=Nature|volume=623|issue=7987|pages=485–486| ...

| name = Echinoderms | image_caption = Extant and extinct echinoderms of six classes: ''[[Fromia indica]]'' ([[Asteroidea]]); ''[[Ophiocoma scolo ...

...st3=Farish A. Jr. |author-link3=Farish Jenkins |date=6 April 2006 |title=A Devonian tetrapod-like fish and the evolution of the tetrapod body plan |journal=Nat ...lberg |date=7 January 2010 |title=Tetrapod trackways from the early Middle Devonian period of Poland |journal=Nature |volume=463 |issue=7227 |pages=43–48 |doi= ...

Like all echinoderms, adult sea urchins have pentagonal symmetry with their [[Echinoderm#Larval ...mbers]], [[sand dollar]]s, [[brittle star]]s, and [[crinoid]]s. Like other echinoderms, they have five-fold symmetry (called [[pentamerism]]) and move by means of ...

...hler, Neil H. Shubin and Farish A. Jenkins Jr. |date=6 April 2006 |title=A Devonian tetrapod-like fish and the evolution of the tetrapod body plan |url=http:// ...g/web/20190217142211/https://depositsmag.com/2017/04/04/folklore-of-fossil-echinoderms/ |archive-date=17 February 2019 |url-status=live |date=4 April 2017 }}</ref ...

...ss extinction/Kellwasser event]] and the [[Hangenberg event|Hangenberg/end-Devonian mass extinction]], wiping out most trilobite diversity and leaving [[Proeti ...]] and [[Ordovician]] periods before entering a drawn-out decline in the [[Devonian]], culminating in the final extinction of the last few survivors at the end ...

About 400&nbsp;million years ago (in the early Devonian Period) there was further subsidence of the rift valley floor. This brought ...e a variety of [[brachiopods]], as well as [[trilobites]], [[molluscs]], [[echinoderms]] (including [[starfish]], [[crinoids]], and the extinct [[blastoids]] and ...

...ans 60 million years, from the end of the [[Devonian]] Period {{Period end|Devonian}} Ma (million years ago) to the beginning of the [[Permian]] Period, {{Peri ...rapodomorph]]s) had evolved from [[lobe-finned fish]] during the preceding Devonian period, became [[pentadactylous]] during the Carboniferous.<ref>Irisarri, I ...

...|year=1999 |title=Lake-level changes, sedimentation and faunas in a Middle Devonian basin-margin fish bed |journal=[[Journal of the Geological Society]] |volum ...rst1=George R. |title=When the invasion of land failed : the legacy of the Devonian extinctions |date=2013 |publisher=Columbia University Press |location=New Y ...

|[[Devonian]] |{{Period span/brief|Devonian|1}} ...

.... |year=1937 |title=The structure and function of the tube feet in certain echinoderms |journal=Journal of the Marine Biological Association of the United Kingdom [[File:Muz PGI 1728-II-16 animated v20150114.svg|thumb|Animation of a [[Devonian]] tetrapod]] ...