PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Neornithischia

Reptilia

Taxonomy

Neornithischia was named by Cooper (1985). It was considered monophyletic by Butler et al. (2008), Butler and Sullivan (2009).

It was reranked as the unranked clade Neornithischia by Sereno (1997), Sereno (1998), Sereno (1999), Butler et al. (2007), Butler et al. (2008), Butler and Sullivan (2009), Han et al. (2012), Zheng et al. (2012), Madzia et al. (2018), Herne et al. (2019), Arbour and Evans (2019).

It was assigned to Ornithischia by Cooper (1985); to Genasauria by Sereno (1997), Sereno (1998), Sereno (1999), Butler et al. (2007), Butler et al. (2008), Butler and Sullivan (2009); and to Ornithischia by Han et al. (2012), Zheng et al. (2012), Madzia et al. (2018), Herne et al. (2019), Arbour and Evans (2019).

Subtaxa

Enigmacursor, Jeholosauridae, Kulindadromeus, Minimocursor, Neornithopoda, Sanxiasaurus, Stormbergia, Thescelosauridae, Yandusaurus

Synonymy list

Year	Name and author
1985	Neornithischia Cooper p. 287
1997	Neornithischia Sereno p. 443
1998	Neornithischia Sereno p. 61
1999	Neornithischia Sereno p. 2138 fig. 2
2007	Neornithischia Butler et al. p. 2044
2008	Neornithischia Butler et al. pp. 13-16 figs. 2-4
2009	Neornithischia Butler and Sullivan p. 22
2012	Neornithischia Han et al. p. 1391 fig. 14
2012	Neornithischia Zheng et al. p. 210
2018	Neornithischia Madzia et al.
2019	Neornithischia Arbour and Evans
2019	Neornithischia Herne et al. p. 574 fig. 25

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida

Rank	Name	Author
class	Reptilia
subclass	Eureptilia	()
—	Romeriida
—	Diapsida	()
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Ornithischia	()
—	Neornithischia	()
—	Neornithischia	()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Unr. †Neornithischia Cooper 1985

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G. †Enigmacursor Maidment and Barrett 2025

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†Enigmacursor mollyborthwickae Maidment and Barrett 2025

Fm. †Jeholosauridae Han et al. 2012

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G. †Jeholosaurus Xu et al. 2000

†Jeholosaurus shangyuanensis Xu et al. 2000

G. †Kulindapteryx Alifanov and Saveliev 2014

†Kulindapteryx ukureica Alifanov and Saveliev 2014

G. †Kulindadromeus Godefroit et al. 2014

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†Kulindadromeus zabaikalicus Godefroit et al. 2014

G. †Minimocursor Manitkoon et al. 2023

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†Minimocursor phunoiensis Manitkoon et al. 2023

G. †Sanxiasaurus Hu Dai et al. 2019

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†Sanxiasaurus modaoxiensis Hu Dai et al. 2019

G. †Stormbergia Butler 2005

Fm. †Thescelosauridae Sternberg 1937

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G. †Haya Makovicky et al. 2011

†Haya griva Makovicky et al. 2011

Subfm. †Orodrominae Brown et al. 2013

G. †Albertadromeus Brown et al. 2013

†Albertadromeus syntarsus Brown et al. 2013

G. †Koreanosaurus Huh et al. 2011

†Koreanosaurus boseongensis Huh et al. 2011

G. †Orodromeus Horner and Weishampel 1988

†Orodromeus makelai Horner and Weishampel 1988

G. †Oryctodromeus Varricchio et al. 2007

†Oryctodromeus cubicularis Varricchio et al. 2007

G. †Zephyrosaurus Sues 1980

†Zephyrosaurus schaffi Sues 1980

Subfm. †Thescelosaurinae Sternberg 1940

G. †Fona Avrahami et al. 2024

†Fona herzogae Avrahami et al. 2024

G. †Nevadadromeus Bonde et al. 2022

†Nevadadromeus schmitti Bonde et al. 2022

G. †Notohypsilophodon Martínez 1998

†Notohypsilophodon comodorensis Martínez 1998

G. †Parksosaurus Sternberg 1937

†Parksosaurus warreni Parks 1926

G. †Yandusaurus He 1979

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†Yandusaurus hongheensis He 1979

Invalid names: Neornithopoda Norman 1984 [empty]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

hydroxyapatiteo

Entire body:

yeso

Adult length:

10 to < 100o

Adult width:

1.0 to < 10o

Adult height:

1.0 to < 10o

Maximum body mass:

100 kgg

Minimum body mass:

3 kgg

Architecture:

compact or denseo

Ontogeny:

accretion, modification of partso

Grouping:

gregariouso

Environment:

terrestrialo

Locomotion:

actively mobileo

Life habit:

ground dwellingo

Diet:

herbivoreo

Reproduction:

oviparouso

Dispersal:

direct/internalo

Dispersal 2:

mobileo

Created:

2004-12-14 12:50:52

Modified:

2004-12-14 14:50:52

Source: g = genus, o = order

References: Marsh 1875, Peczkis 1995, Kiessling 2004

Age range: base of the Hettangian to the top of the Lancian or 201.40000 to 66.00000 Ma

Collections (67 total)

Time interval	Ma	Country or state	Original ID and collection number
Hettangian - Sinemurian	201.4 - 192.9	South Africa (Eastern Cape)	Fabrosauridae indet. (45796)
Toarcian - Aalenian	184.2 - 170.9	China (Chongqing)	Sanxiasaurus modaoxiensis (212359)
Bajocian	170.9 - 168.2	China (Sichuan)	Yandusaurus hongheensis (57061) Yandusaurus sp. (193845)
Late/Upper Bathonian - Late/Upper Jurassic	168.2 - 143.1	Russian Federation (Zabaykal'ye)	Kulindadromeus zabaikalicus, Kulindapteryx ukureica (159014)
Kimmeridgian	154.8 - 149.2	USA (Colorado)	Hypsilophodontidae indet. (59375)
Kimmeridgian - Tithonian	154.8 - 143.1	USA (Colorado)	Enigmacursor mollyborthwickae (241291)
Late/Upper Kimmeridgian	152.21 - 149.2	Portugal (Lourinha)	Neornithischia indet. (154213)
Late/Upper Kimmeridgian - Early/Lower Tithonian	152.21 - 145.06	Portugal (Lisboa)	Neornithischia indet. (163145)
Tithonian - Berriasian	149.2 - 137.05	Thailand (Mukdahan)	Neornithischia indet. (92150)
Tithonian - Berriasian	149.2 - 137.05	Thailand (Kalasin)	Neornithischia indet. (48872) Ornithopoda indet. (157421)
Valanginian	137.05 - 132.6	Russian Federation (Buryat)	Jeholosauridae indet. (58196) Ornithopoda indet., Psittacosaurus sp. (229031)
Late/Upper Barremian - Early/Lower Aptian	125.77 - 119.57	China (Liaoning)	Jeholosaurus shangyuanensis (53493) Jeholosaurus sp. (235272)
Aptian - Albian	121.4 - 100.5	USA (Wyoming)	Zephyrosaurus sp. (137567 137577)
Albian	113.2 - 100.5	USA (Montana)	Zephyrosaurus schaffi (69693)
Albian	113.2 - 100.5	USA (Wyoming)	Zephyrosaurus sp. (137562)
Late/Upper Albian	106.3 - 100.5	USA (Montana)	Oryctodromeus cubicularis (73373)
Late/Upper Albian - Early/Lower Cenomanian	106.3 - 93.9	USA (Idaho)	Oryctodromeus sp. (227190 227193 227197 227198 227199 227200 227201 227202)
Cenomanian	100.5 - 93.9	USA (Utah)	Fona herzogae (235574)
Cenomanian	100.5 - 93.9	USA (Nevada)	Hypsilophodontidae indet. (181585)
Early/Lower Cenomanian	100.5 - 93.9	USA (Utah)	Fona herzogae (235540) Ornithopoda indet. (228453) Thescelosaurinae indet. (235578 235579)
Late/Upper Cenomanian - Early/Lower Turonian	100.5 - 89.8	Argentina (Chubut)	Dryomorpha indet. (66893)
Santonian - Campanian	85.7 - 72.2	Mongolia (Dornogov)	Hypsilophodontidae indet. (80183)
Campanian	83.6 - 72.2	South Korea (Jeollanam-do)	Koreanosaurus boseongensis (52983 98685)
Campanian	83.6 - 72.2	Canada (Alberta)	Orodrominae indet. (144509)
Campanian	83.6 - 72.2	USA (Alberta)	Albertadromeus syntarsus (144510)
Judithian	83.6 - 72.2	Canada (Alberta)	Orodrominae indet. (14451)
Late/Upper Campanian	83.6 - 72.2	USA (Alaska)	Thescelosaurinae indet. (14495)
Late/Upper Campanian	83.6 - 72.2	USA (Montana)	Orodromeus makelai (22690 53043) Orodromeus sp. (25658)
Late/Upper Campanian	83.6 - 72.2	Canada (Alberta)	Thescelosauridae indet. (227125)
Late/Upper Campanian	83.6 - 72.2	Mongolia (Omnogov Aimak)	Haya griva (68517)
Middle Campanian	83.6 - 72.2	USA (Montana)	Hypsilophodontidae indet. (13281 22653) Orodromeus makelai (14453) Orodromeus sp. (53058)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	Canada (Saskatchewan)	Thescelosauridae indet. (14494)
Middle Campanian - Late/Upper Campanian	83.6 - 72.2	USA (Montana)	Thescelosaurus neglectus (14446)
Early/Lower Maastrichtian	72.2 - 66.0	Canada (Alberta)	Parksosaurus warreni (135741 224151) Thescelosaurus warreni (48624)
Early/Lower Maastrichtian	72.2 - 66.0	USA (Alaska)	Thescelosaurinae indet. (88975)
Lancian	72.2 - 66.0	USA (Wyoming)	Thescelosauridae indet. (14541 14542 70340 75297 75429 75432 75447)
Late/Upper Maastrichtian	72.2 - 66.0	USA (Wyoming)	Thescelosauridae indet. (239131)
Late/Upper Maastrichtian	72.2 - 66.0	USA (Montana)	Thescelosaurus neglectus (13142)