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...|title=First occurrence of caryocaridids (Crustacea, Phyllocarida) in the Ordovician of North China |url=https://www.sciencedirect.com/science/article/abs/pii/S [[Category:Extant Cambrian first appearances]] ...

| fossil_range = {{fossil range|Ordovician|Recent}} ...enolaemata/ Stenolaemata.] The Digital Atlas of Ordovician Life.</ref> All extant (living) species are in the order [[Cyclostomatida]], the third-largest ord ...

| fossil_range = {{fossil range|Upper Ordovician|Recent}} ...ellid brachiopod from the [[Cincinnatian (geology)|Cincinnatian]] (Upper [[Ordovician]]) of SE [[Indiana]]. ...

| fossil_range = {{fossilrange|Darriwilian|Recent|earliest=Early Ordovician}} ...ropod]]s that contains the extinct [[Eurypterida]] (sea scorpions) and the extant [[Xiphosura]] (horseshoe crabs). The term was originally used by [[James Dw ...

| 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 ...

...ttps://www.cambridge.org/core/journals/journal-of-paleontology/article/abs/ordovician-and-silurian-hyoliths-and-gastropods-reassigned-from-the-hyolitha-from-the- [[Image:Hyoliths02.JPG|thumb|250px|Hyoliths from the Middle [[Ordovician]] of northern [[Estonia]]; these are internal molds.]] ...

| fossil_range = [[Ordovician|Late Ordovician]]-[[Devonian|Late Devonian]]<br>~{{fossil range|457|360}} ...pdf}}</ref> with a broader time range described from the [[Ordovician|Late Ordovician]].<ref name=FWPhacops>[https://paleobiodb.org/classic/checkTaxonInfo?taxon_ ...

...icrofossils |series=Springer Geology |pages=1–25 |editor-last=Jain |editor-first=Sreepat |place=New Delhi |publisher=Springer India |language=en |doi=10.100 ...species were large and smooth-walled;<ref name="Jenkins1970" /> by the mid-Ordovician a large and expanding variety of ornament, and of hollow appendages, was ev ...

{{Short description|Extant subclass of cephalopods}} ...rilacinoceras.jpg|thumb|Fossil nautiloid ''[[Trilacinoceras]]'' from the [[Ordovician]] of [[China]].]] ...

| image2_caption = The extant [[Atlantic horseshoe crab]] (''Limulus polyphemus'') ...eshoe crab|Limulidae]]). They first appeared in the [[Hirnantian]] ([[Late Ordovician]]). Currently, there are only four living species. Xiphosura contains one s ...

.../nature14438 |pmc=4648279 |pmid=25903631}}</ref>}} <small>(Possible [[Late Ordovician]] record, 444 Ma)<ref name="Brazeau-Friedman-2015"/></small> ...itor2-last=Orgel P.R.O. |editor2-first=Joseph |editor3-last=Loewy |editor3-first=Zvi|doi-access=free }}</ref> horizontal [[semicircular canal]] of the [[inn ...

...ed by [[Otto Schindewolf]] in 1942, through transitional forms such as the Ordovician ''[[Lituites]]'' can be rejected out of hand as evolutionarily unlikely. '' ...ce of nautilids from that region.<ref name=":2">{{Cite journal |last=Kiel |first=Steffen |last2=Goedert |first2=James L. |last3=Tsai |first3=Cheng‐Hsiu |dat ...

...first4=J. |title=Phylogenetic analysis reveals that ''Rhabdopleura'' is an extant graptolite |journal=Lethaia |year=2013 |volume=46 |number=1 |pages=34–56 |d ...ed the idea that the living pterobranch ''[[Rhabdopleura]]'' represents an extant graptolite which diverged from the rest of the group in the Cambrian.<ref n ...

...capods are [[scavenger]]s. The order is estimated to contain nearly 15,000 extant species in around 2,700 genera, with around 3,300 fossil species.<ref name= ...nd 455 million years ago, with the [[Dendrobranchiata]] (prawns) being the first group to diverge. The remaining group, called [[Pleocyemata]], then diverg ...

...ith a cap-like shell, inhabiting [[deep sea]] environments. [[Extant taxon|Extant]] representatives were not recognized as such until 1952; previously they w ...first2=J.S. |year=2001 |title=Latest helcionelloid molluscs from the Lower Ordovician of Kazakhstan |journal=Palaeontology |volume=44 |issue=4 |pages=681–694 |do ...

| fossil_range={{fossil range|Middle Ordovician|Present|ref=<ref name="Gray 1989">{{cite journal|last1=Gray|first1=Jane|las ...than a billion years ago. The [[plastid]]s (membranous organelles) in all extant photosynthetic species result from secondary [[endosymbiosis]] between a eu ...

...d in both freshwater and marine environments, first appearing during the [[Ordovician]], and perishing during the [[Late Devonian extinction|Frasnian–Famennian e ...]] |year=1998 |isbn=978-0-19-854047-2 |chapter=Early vertebrates and their extant relatives |pages=123–127}}</ref> Scales found around the gill region were g ...

...ge, ''[[Chondrocladia|Chondrocladia lampadiglobus]]'' <ref>{{cite journal |first=J. |last=Vacelet |title=New carnivorous sponges (Porifera, Poecilosclerida) ...phylum]] [[Porifera]] which include greater than 90% of all [[extant taxon|extant]] sponges with nearly 8,800 [[species]] worldwide (according to the World P ...

...boniferous]]–[[Neogene]] ({{geological range|Mississippian|earliest=Middle Ordovician|Recent|ref=<ref name=Steiner1992/><!-- Steiner says earliest are Mid Ord--> The Ordovician ''[[Rhytiodentalium]] kentuckyensis'' has been interpreted as an early ante ...

...he early [[Silurian]] by developing folding [[joint|articulation]]s in the first pairs of [[gill arch]]es. ...superclass]] Cyclostomi.<ref name="janvier1">{{cite journal |last=Janvier |first=P. | title = MicroRNAs revive old views about jawless vertebrate divergence ...