Thyreophora

Members of Thyreophora are characterised by the presence of osteoderms (bony growths within the skin), with these osteoderms having lateral keels. Characters of the skull and jaws distinctive (synapomorphic) of thyreophorans include "absence of a deep elliptic fossa along the sutural line of the nasals, presence of a wide jugal, remodeling of skull dermal bone, down-turned dentary tooth row".{{Cite journal |last1=Breeden |first1=Benjamin T. |last2=Rowe |first2=Timothy B. |date=2020-07-03 |title=New Specimens of Scutellosaurus Lawleri Colbert, 1981, from the Lower Jurassic Kayenta Formation in Arizona Elucidate the Early Evolution of Thyreophoran Dinosaurs |url=https://www.tandfonline.com/doi/full/10.1080/02724634.2020.1791894 |journal=Journal of Vertebrate Paleontology |language=en |volume=40 |issue=4 |pages=e1791894 |doi=10.1080/02724634.2020.1791894 |issn=0272-4634|url-access=subscription }} Among primitive thyreophorans, Scutellosaurus was likely primarily bipedal, while the more quadrupedally adapted Scelidosaurus may have been bipedal for some of the time, particularly as a juvenile. Stegosaurs and ankylosaurs are thought to have been obligately quadrupedal.{{Cite journal |last1=Anderson |first1=Lilian |last2=Brassey |first2=Charlotte |last3=Pond |first3=Stuart |last4=Bates |first4=Karl |last5=Sellers |first5=William Irvin |date=October 2023 |title=Investigating the quadrupedal abilities of Scutellosaurus lawleri and its implications for locomotor behavior evolution among dinosaurs |url=https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.25189 |journal=The Anatomical Record |language=en |volume=306 |issue=10 |pages=2514–2536 |doi=10.1002/ar.25189 |pmid=36896818 |issn=1932-8486}}

While ranked taxonomy has largely fallen out of favor among dinosaur paleontologists, a few 21st century publications have retained the use of ranks, though sources have differed on what its rank should be. Most have listed Thyreophora as an unranked taxon containing the traditional suborders Stegosauria and Ankylosauria, though Thyreophora is also sometimes classified as a suborder, with Ankylosauria and Stegosauria as infraorders.

Thyreophora was first named by Nopcsa in 1915.{{Cite journal|last=Nopcsa|first=Ferenc|date=1915|title=Die dinosaurier der Siebenbürgischen landesteile Ungarns|url=http://dinodata.de/dinothek/pdf_d/1915/001_Nopsca_Jahrb_1915_dd.pdf|journal=Mitteilungen aus dem Jahrbuche der KGL|volume=23|pages=1–24}} Thyreophora was defined as a clade by Paul Sereno in 1998, as "all genasaurs more closely related to Ankylosaurus than to Triceratops". Thyreophoroidea was first named by Nopcsa in 1928 and defined by Sereno in 1986, as "Scelidosaurus, Ankylosaurus, their most recent common ancestor and all of its descendants".{{Cite journal|last=Sereno|first=Paul|date=1986|title=Phylogeny of the bird-hipped dinosaurs (order Ornithischia)|journal=National Geographic Research|volume=2|issue=2|pages=234–256}} Eurypoda was first named by Sereno in 1986 and defined by him in 1998, as "Stegosaurus, Ankylosaurus, their most recent common ancestor and all of their descendants".{{Cite journal|last=Paul|first=Sereno|date=1998|title=A rationale for phylogenetic definitions, with application to the higher-level taxonomy of Dinosauria|journal=Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen|volume=210|issue=1|pages=41–83|doi=10.1127/njgpa/210/1998/41}}

In 2021, an international group of researchers led by Daniel Madzia registered almost all of the most commonly used ornithischian clades under the International Code of Phylogenetic Nomenclature, with the intent of standardizing their definitions. According to Madzia et al., Thyreophora is defined as the largest clade containing Ankylosaurus magniventris and Stegosaurus stenops but not Iguanodon bernissartensis and Triceratops horridus. They also defined the less inclusive Eurypoda as "the smallest clade containing Ankylosaurus magniventris and Stegosaurus stenops" to include the ankylosaurs and stegosaurs to the exclusion of basal thyreophorans. A later study conducted by André Fonseca and colleagues in 2024 gave a formal definition for Thyreophoroidea in the PhyloCode as "the smallest clade containing Ankylosaurus magniventris, Scelidosaurus harrisonii, and Stegosaurus stenops".

The following cladogram shows the results of the phylogenetic analysis Soto-Acuña et al. (2021).{{cite journal |last1=Soto-Acuña |first1=Sergio |last2=Vargas |first2=Alexander O. |last3=Kaluza |first3=Jonatan |last4=Leppe |first4=Marcelo A. |last5=Botelho |first5=Joao F. |last6=Palma-Liberona |first6=José |last7=Simon-Gutstein |first7=Carolina |last8=Fernández |first8=Roy A. |last9=Ortiz |first9=Héctor |last10=Milla |first10=Verónica |last11=Aravena |first11=Bárbara |last12=Manríquez |first12=Leslie M. E. |last13=Alarcón-Muñoz |first13=Jhonatan |last14=Pino |first14=Juan Pablo |last15=Trevisan |first15=Cristine |display-authors=10 |date=2021 |title=Bizarre tail weaponry in a transitional ankylosaur from subantarctic Chile |journal=Nature |volume=600 |issue=7888 |pages=259–263 |bibcode=2021Natur.600..259S |doi=10.1038/s41586-021-04147-1 |pmid=34853468 |s2cid=244799975 |last16=Mansilla |first16=Héctor |last17=Hinojosa |first17=Luis Felipe |last18=Muñoz-Walther |first18=Vicente |last19=Rubilar-Rogers |first19=David}} In their description of Jakapil the following year, Riguetti et al modified the same matrix and found it to occupy a position as the sister taxon to the Eurypoda.{{Cite journal |last1=Riguetti |first1=Facundo J. |last2=Apesteguía |first2=Sebastián |last3=Pereda-Suberbiola |first3=Xabier |date=2022-08-11 |title=A new Cretaceous thyreophoran from Patagonia supports a South American lineage of armoured dinosaurs |journal=Scientific Reports |language=en |volume=12 |issue=1 |pages=11621 |doi=10.1038/s41598-022-15535-6 |issn=2045-2322 |pmc=9372066 |pmid=35953515}} A similar result was found by Fonseca et al. in 2024.{{cite journal|last=Fonseca|first=A.O.|last2=Reid|first2=I.J.|last3=Venner|first3=A.|last4=Duncan|first4=R.J.|last5=Garcia|first5=M.S.|last6=Müller|first6=R.T.|year=2024|title=A comprehensive phylogenetic analysis on early ornithischian evolution|journal=Journal of Systematic Palaeontology|volume=22|issue=1|pages=2346577|doi=10.1080/14772019.2024.2346577}}

{{clade|style=font-size:85%; line-height:85%;

|label1=Thyreophora

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|1=Laquintasaura

|2=Lesothosaurus }}

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|1=Emausaurus

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|label1=Thyreophoroidea

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|label1=Scelidosauridae

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|1=Yuxisaurus

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|1=Jakapil

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|label1=Eurypoda

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|1=Stegosauria

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|label1=Ankylosauria

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|1=Parankylosauria

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In 2020, as part of his monograph on Scelidosaurus, David Norman revised the relationships of early thyreophorans, finding that Stegosauria was the most basal branch, with Scutellosaurus, Emausaurus and Scelidosaurus being progressive stem groups to Ankylosauria, rather than to Stegosauria+Ankylosauria. A cladogram is given below:{{Cite journal|last=Norman|first=David B|date=2021-01-01|title=Scelidosaurus harrisonii (Dinosauria: Ornithischia) from the Early Jurassic of Dorset, England: biology and phylogenetic relationships|url=https://academic.oup.com/zoolinnean/article/191/1/1/5893854|journal=Zoological Journal of the Linnean Society|language=en|volume=191|issue=1|pages=1–86|doi=10.1093/zoolinnean/zlaa061|issn=0024-4082|url-access=subscription}}

{{clade

|label1=Thyreophora

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|1= Stegosauria

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|1=Scutellosaurus

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|1=Emausaurus

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|1=Scelidosaurus 80px

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• thyreophoroi, Greek soldiers bearing a thyreos shield
• List of thyreophoran type specimens

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{{Ornithischia|H.}}

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Category:Dinosaur clades