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| fossil_range = [[Early Ordovician]]<br>{{Fossil range|480|470}} ...tion|extinct]] [[species]] of [[Agnatha|jawless fish]] that lived in the [[Ordovician]] period, about 480 to 470 million years ago. Its remains were found in the ...

...[[trilobite]]s in the order [[Phacopida]] that lived from the [[Floian]] (Ordovician) to the [[Devonian]] and includes 33 genera.<ref>{{cite book |author=Robert [[Category:Early Ordovician first appearances]] ...

| fossil_range = {{Fossil range|Botomian|Permian|Early Cambrian ([[Botomian]])–[[Permian]]}} | image_caption = ''[[Vinlandostrophia ponderosa]]'' (Upper Ordovician). ...

| fossil_range = [[Ordovician]] - [[Permian]] (possibly [[Triassic]]) ...America]], [[Europe]], [[Asia]], [[Africa]], and [[Australia]] from the [[Ordovician]] through [[Triassic]] from 490—203.7 [[Annum|mya]], existing for approxima ...

| 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 ...

| 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|Upper Ordovician|Recent}} ...ellid brachiopod from the [[Cincinnatian (geology)|Cincinnatian]] (Upper [[Ordovician]]) of SE [[Indiana]]. ...

| fossil_range = {{fossil range|Early Cambrian|Early Ordovician|ref=<ref name="Dong" />}} ...s allied to [[Ecdysozoa]] and known from strata of Lower Cambrian to Lower Ordovician age containing five [[species]]. ...

| fossil_range = middle [[Silurian]] - early [[Devonian]] ...sive [[mudcrack]]s or shelly [[packstone]]s, generally mid-[[Silurian]] to early-[[Devonian]] in age. ...

...is a [[class (biology)|class]] of [[extinct]] [[mollusc]]s dating from the early [[Cambrian]] to the [[Lopingian|Late Permian]]. They were initially thought ...nsky | first = A. V. | year = 1999 | title = Shell microstructures of the Early Cambrian ''Anabarella'' and ''Watsonella'' as new evidence on the origin of ...

| fossil_range = {{fossil range|480|359|[[Early Ordovician]] to [[Late Devonian]]}} '''Pteraspidomorpha''' is an extinct [[class (biology)|class]] of early [[jawless fish]]. They have long been regarded as closely related or even a ...

| fossil_range = {{fossil range|445|0}}[[Ordovician]] – [[Holocene|Present]] ...dants of the [[Acanthodian]]s ("spiny sharks") from the [[Llandovery epoch|Early Silurian]] Period; however, more recent discoveries show that the "spiny sh ...

...] [[Phacopida]]. Species belonging to the Phacopina lived from the Lower [[Ordovician]] ([[Tremadocian]]) through the end of the Upper [[Devonian]] ([[Famennian] The Early Ordovician genus ''[[Gyrometopus]]'' (superfamily Dalmanitoidea, family Diaphanometopi ...

...Ordovician trilobite distribution and diversity|author= J.M. Adrain|title= Early Palaeozoic Biogeography and Palaeogeography|series= Memoirs of the Geologic ...net |first3=Claude |last4=Crônier |first4=Catherine |date=2022 |title=Post-Ordovician trilobite diversity and evolutionary faunas |journal=Earth-Science Reviews ...

| 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]]. ...

| fossil_range = {{fossil range | Early Ordovician | Late Devonian | ref=<ref name="Traverse2007">{{Cite book | last1 = Traver ..., although it is not the only member of the class. It is known from Lower Ordovician to Upper Devonian deposits<ref name="Traverse2007" /> both as calcitic shel ...

...rcontinents|paleocontinents]].<ref name='Treatise'>{{cite book|last= Moore|first= R.C.|year= 1959|title= Arthropoda I - Arthropoda General Features, Proarth ...Ordovician trilobite distribution and diversity|author= J.M. Adrian|title= Early Palaeozoic Biogeography and Palaeogeography|series= Memoirs of the Geologic ...

| fossil_range = {{fossilrange|Darriwilian|Recent|earliest=Early Ordovician}} ...Series |publisher=[[Springer Verlag]] |isbn=978-0-412-75420-3 |chapter=The early history and phylogeny of the chelicerates |author1=J. A. Dunlop |author2=P. ...

...ossil range|earliest=411|407|231|latest = 0}}[[Pragian]] (questionable) or early [[Emsian]] – Middle [[Carnian]] <br> <small>Possible descendant taxon [[Col ...l order of more or less straight-shelled (orthoconic) [[cephalopod]]s that first appeared during the [[Emsian]] stage of the [[Devonian]] period (407 millio ...

...e = 'Cambrian' demosponges in the Ordovician of Morocco: Insights into the early evolutionary history of sponges| journal = Geobios| last1 = Botting| issue ...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 ...