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Yuanyanglong bainian

Osteichthyes

Taxonomy
Yuanyanglong bainian was named by Hao et al. (2025). Its type specimen is PV02476-1 (specimen field number, MET-21-037), a partial skeleton, and it is a 3D body fossil. Its type locality is Maortu, which is in an Aptian/Albian fluvial sandstone in the Miaogou Formation of China. It is the type species of Yuanyanglong.

Synonymy list
YearName and author
2025Yuanyanglong bainian Hao et al.

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
classOsteichthyes
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
—Sauropsida
classReptilia
subclassEureptilia()
—Romeriida
RankNameAuthor
—Diapsida()
—Archosauromorpha(Huene 1946)
—Crocopoda
—ArchosauriformesGauthier 1986
—Eucrocopoda
—Archosauria()
informalAvemetatarsalia
—Ornithodira
—Dinosauromorpha
—Dinosauriformes
—Dinosauria()
—Saurischia()
—Theropoda()
—Neotheropoda
—AverostraPaul 2002
—Tetanurae
—Coelurosauria()
—Maniraptora
infraorderOviraptorosauria
genusYuanyanglong
speciesbainian

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.

†Yuanyanglong bainian Hao et al. 2025
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Diagnosis
ReferenceDiagnosis
M. Hao et al. 2025Yuanyanglong bainian is a small-bodied oviraptorosaurian that differs from all previously known species in having the following unique combination of character states (autapomorphies indicated by asterisk): no pleurocoels on the dorsal, sacral and anterior caudal centra; the preacetabular process of the ilium approximately 40% longer than the postacetabular process*; hook-like anteroventral process of the ilium extending to the level of the dorsal acetabular margin*; pubic shaft nearly straight in lateral view; reduced anterior process of the pubic boot shorter than the hooked posterior process*; broad obturator process with a strongly concave ventral edge; slender tibiotarsus (distal end mediolateral width to whole bone length ratio about 0.08)*; tibia, astragalus and calcaneum fused into tibiotarsus without distinct suture; distal tarsals and metatarsals fused without distinct suture; arctometatarsalian pes has only the proximal-most extremity of metatarsal III obscured from anterior view.
Measurements
No measurements are available
Composition: hydroxyapatiteinfrao
Entire body: yesinfrao
Adult length: 1.0 to < 10infrao
Adult width: 0.1 to < 1.0infrao
Adult height: 1.0 to < 10infrao
Thickness: intermediateinfrao
Architecture: compact or denseinfrao
Ontogeny: accretion, modification of partsinfrao
Grouping: solitaryo
Environment: terrestrialinfrao
Locomotion: actively mobileinfrao
Life habit: ground dwellinginfrao
Depth habitat: surfaceinfrao
Diet: omnivoreinfrao
Reproduction: oviparousinfrao
Dispersal: direct/internalinfrao
Dispersal 2: mobileinfrao
Created: 2005-03-06 14:07:56
Modified: 2005-03-06 16:07:56
Source: infrao = infraorder, o = order
References: Kiessling 2004, Marsh 1875, Averianov and Yarkov 2004

Age range: base of the Aptian to the top of the Albian or 121.40000 to 100.50000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Aptian - Albian121.4 - 100.5China (Nei Monggol) Yuanyanglong bainian (type locality: 238672)