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{{short description|Third and final epoch of the Ordovician Period, 458–444 million years ago}} | name = {{color|white|Late/Upper Ordovician}} ...

...range = {{fossilrange|Middle Ordovician|Permian|earliest=Middle Cambrian|[[Ordovician]] - [[Permian]]}} ...ref> They first appear, along with many other echinoderm classes, in the [[Ordovician]] period, and reached their greatest diversity in the [[Mississippian age|M ...

...sjg43020097|title=The earliest turrilepadid: A machaeridian from the Lower Ordovician of the Northwest Highlands|journal=Scottish Journal of Geology|volume=43|is ...nct group of armoured, segmented [[annelid]] worms, known from the Early [[Ordovician]] (Late Tremadoc) to [[Carboniferous]]. It consists of three distinct famil ...

{{Short description|First epoch of the Ordovician period}} | name = {{color|white|Early/Lower Ordovician}} ...

{{Short description|Class of echinoderms closely related to sea stars}} | fossil_range = {{fossil range|488|0}} [[Ordovician]] to [[Present]] ...

{{Short description|Class of echinoderms}} | fossil_range = {{fossilrange|Ordovician|recent|ref=<ref>{{cite web |title=Crinoidea – Digital atlas of Ancient life ...

| name = Ordovician | color = Ordovician ...

...:2">{{Cite journal|last=Sheehan|first=Peter M|date=May 2001|title=The Late Ordovician Mass Extinction|journal=[[Annual Review of Earth and Planetary Sciences]]|l ...7 April 2012 |title=Climate change and the selective signature of the Late Ordovician mass extinction |journal=[[Proceedings of the National Academy of Sciences ...

{{short description|Class of echinoderms}} | fossil_range = {{fossil range|Darriwilian|present|Middle Ordovician-present}} ...

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

Together with the [[echinoderms]], the hemichordates form the [[Ambulacraria]], which are the closest extan ...|thumb|right|''Amplexograptus'', a [[graptolite]] hemichordate, from the [[Ordovician]] near [[Caney Springs, Tennessee|Caney Springs]], [[Tennessee]].]] ...

...e [[Bryozoa]]ns being the only calcifying phylum to appear later, in the [[Ordovician]]. The sudden appearance of shells has been linked to a change in [[ocean c ...

| fossil_range = {{Fossil range|Ordovician|Present}} ...[[hadal zone]] depths. The fossil record of the echinoids dates from the [[Ordovician]] period, some 450 million years ago. The closest echinoderm relatives of t ...

...ng|thumb|left|upright=1.35|Southern [[Gondwana]] during the [[Cambrian]]-[[Ordovician]] Periods. Today's continents into which this Supercontinent eventually bro ...ern [[Gondwana]], just south of Southern Africa, during the [[Cambrian]]-[[Ordovician]] Periods (starting about 510&nbsp;million years ago, and ending about 330– ...

{{Short description|Class of echinoderms, marine animal}} | fossil_range = {{Fossil range|Ordovician|Recent}} ...

...tle=Calcite precipitation and dissolution of biogenic aragonite in shallow Ordovician calcite seas |year=2004 |last1=Palmer |first1=Timothy |last2=Wilson |first2 ...lcifying organisms in the sea, such as molluscs foraminifera, crustaceans, echinoderms and corals, are susceptible to pH changes.<ref name=Tyrrell /> Meanwhile, ...

..., with trilobites reaching an apex of diversity during the late Cambrian–[[Ordovician]], and remained diverse during the following [[Silurian]] and early [[Devon ...ive and appendicular soft-parts, with behavioural implications, in a large Ordovician trilobite from the Fezouata Lagerstätte, Morocco |journal=Scientific Report ...

...= {{fossil range|earliest=Katian|Middle Triassic|recent}} <small>Possible Ordovician and Carboniferous records</small> ...ology (biology)|morphologies]] occurring on bedding planes from the Late [[Ordovician]] ([[Katian]]) [[Vaureal Formation|Vauréal Formation]] ([[Canada]]). In the ...

...[Ediacaran]] period 538.8 Ma (million years ago) to the beginning of the [[Ordovician]] Period 486.85 Ma.<ref name="ICS" /> ...roposed the disputed strata belong to its own system, which he named the [[Ordovician]].<ref name="Davidson-2021" /> ...

...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 ...hor = Löfgren, A. | year = 2004 | title = The conodont fauna in the Middle Ordovician ''Eoplacognathus pseudoplanus'' Zone of Baltoscandia | journal = Geological ...