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| image_caption = ''[[Vinlandostrophia ponderosa]]'' (Upper Ordovician). ...ared during the [[Early Cambrian]] period and became very diverse by the [[Ordovician]], living in shallow-shelf seas. Orthids are the oldest member of the subp ...

| fossil_range = [[Late Ordovician]], {{Fossil range|450}} ...naspis splendens, new genus, new species, a new ostracoderm from the Upper Ordovician of North America. Proceedings of the United States National Museum 108(3391 ...

| fossil_range = [[Early Ordovician]]<br>{{Fossil range|480|470}} ...t was not determined that they were the oldest known vertebrates until the late 1960s. ''Arandaspis'' is named after a local [[Indigenous Australians|Indig ...

| fossil_range = [[Early Ordovician]] – [[Late Ordovician]], {{fossil range|480|455}} ....jpg|thumb|left|''[[Sacabambaspis]]'', the best known arandaspid, from the Ordovician of Bolivia. shows the characteristic, frontally positioned eyes, like car h ...

| fossil_range = {{fossil range|Ordovician|Recent}} ...natlas.org/atlas/bryozoa/stenolaemata/ Stenolaemata.] The Digital Atlas of Ordovician Life.</ref> All extant (living) species are in the order [[Cyclostomatida]] ...

| image_caption = Receptaculitid from the [[Ordovician]] of [[Estonia]]. ...ll continents except Antarctica.<ref>Rietschel, S. and Nitecki, M.H. 1984. Ordovician Receptaculitid algae from Burma. Palaeontology, vol. 27, p. 415-420.</ref>< ...

| fossil_range = {{fossil range|Middle Ordovician|Permian|[[Ordovician]]–[[Permian]]}} ...ry rugose coral [[Grewingkia|''Grewingkia canadensis'']] in three views; [[Ordovician]], [[Indiana]] ...

| fossil_range = {{fossil_range|Cambrian Stage 3|Late Ordovician}} ...half of the Lower [[Cambrian]], and the last species did not survive the [[Ordovician–Silurian extinction event]]. ...

| fossil_range = {{fossil range|480|359|[[Early Ordovician]] to [[Late Devonian]]}} Pteraspidomorphs have been first regarded as related to [[bony fish]]es, then to [[shark]]s, then ancestral ...

...497|359|ref=<ref name=HarperServais>{{cite book|chapter= 20. A synopsis of Ordovician trilobite distribution and diversity|author= J.M. Adrain|title= Early Palae ...] of [[trilobite|trilobites]] that lived from the Late [[Cambrian]] to the Late [[Devonian]]. It is made up of a morphologically diverse assemblage of taxa ...

...rcontinents|paleocontinents]].<ref name='Treatise'>{{cite book|last= Moore|first= R.C.|year= 1959|title= Arthropoda I - Arthropoda General Features, Proarth ...rinella]]''.<ref name=HarperServais>{{cite book|chapter= 20. A synopsis of Ordovician trilobite distribution and diversity|author= J.M. Adrian|title= Early Palae ...

...tinct]] [[mollusc]]s dating from the early [[Cambrian]] to the [[Lopingian|Late Permian]]. They were initially thought to be [[bivalve]]s, but were later g ...adulthood.<ref name='Kouchinsky2007'>{{cite journal | last = Kouchinsky | first = A. V. | year = 1999 | title = Shell microstructures of the Early Cambria ...

| fossil_range = {{fossil range | Early Ordovician | Late Devonian | ref=<ref name="Traverse2007">{{Cite book | last1 = Traverse | fi ...naceous 'linings'.<ref>Wood, G.D., Miller, M.A., and Bergstrom, S.M. 2004. Late Devonian (Frasnian) tentaculite organic remains in palynological preparatio ...

...journal |last1=Villas |first1=E. |last2=Cocks |first2=L. R. M. |title=The First Early Silurian Brachiopod Fauna from the Iberian Peninsula |journal=Journal ...lution and paleogeography of Eospirifer (Spiriferida, Brachiopoda) in Late Ordovician and Silurian |journal=Science China Earth Sciences |date=September 2012 |vo ...

| fossil_range = {{fossil range|445|0}}[[Ordovician]] – [[Holocene|Present]] ...ostomes have two major adaptations that relate to [[aquatic respiration]]. First, the early teleostomes probably had some type of [[operculum (fish)|opercul ...

| fossil_range = {{fossilrange|Darriwilian|Recent|earliest=Early Ordovician}} ...5=Sharma |first15=Prashant P |date=2022-02-03 |editor-last=Teeling |editor-first=Emma |title=Comprehensive Species Sampling and Sophisticated Algorithmic Ap ...

| fossil_range = {{fossil range|Lower Ordovician|Upper Triassic|latest=Early Cretaceous}} ...63|url-access=subscription }}</ref> They were most common however from the Ordovician to the [[Devonian]]. ...

...07.02.006| first1 = J.| volume = 40| title = 'Cambrian' demosponges in the Ordovician of Morocco: Insights into the early evolutionary history of sponges| journa ...il-gallery/view-species.php?id=66&m=9&|title=The Burgess Shale|last=Canada|first=Royal Ontario Museum and Parks|date=2011-06-10|website=burgess-shale.rom.on ...

| fossil_range = {{fossil_range|Cambrian Stage 3 |Late Ordovician}} ...vician]] transition, and the last agnostidans went [[extinct]] in the Late Ordovician.<ref>{{cite journal | vauthors = Barnes BD, Sclafani JA, Zaffos A | title = ...

| fossil_range = [[Ordovician#Subdivisions|Late Ordovician]]–[[Devonian#Subdivisions|Middle Devonian]], {{Fossil range|449.5|376.1|ref ...lobite]] in the order [[Phacopida]]. They lived from the [[Ordovician|Late Ordovician]] to [[Devonian|Middle Devonian]].<ref name=FWDalmanites /> ...