PBDB Taxon

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

Oksoko avarsan

Osteichthyes - Oviraptoridae

Taxonomy

Oksoko avarsan was named by Funston et al. (2020). Its type specimen is MPC-D 102/110a, a skeleton, and it is a 3D body fossil. Its type locality is Bugin Tsav I [HMNS-GIN], which is in a Maastrichtian fine channel fill siltstone/sandstone in the Nemegt Formation of Mongolia.

Synonymy list

Year	Name and author
2020	Oksoko avarsan Funston et al. p. 2–3 fig. 1–3
2021	Oksoko avarsan Funston et al. p. 7
2022	Oksoko avarsan Krumenacker et al. p. 1342

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

Rank	Name	Author
—	Archosauromorpha	(Huene 1946)
—	Crocopoda
—	Archosauriformes	Gauthier 1986
—	Eucrocopoda
—	Archosauria	()
informal	Avemetatarsalia
—	Ornithodira
—	Dinosauromorpha
—	Dinosauriformes
—	Dinosauria	()
—	Saurischia	()
—	Theropoda	()
—	Neotheropoda
—	Averostra	Paul 2002
—	Tetanurae
—	Coelurosauria	()
—	Maniraptora
infraorder	Oviraptorosauria
family	Oviraptoridae
subfamily	Heyuanninae
genus	Oksoko
species	avarsan

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.

†Oksoko avarsan Funston et al. 2020

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Diagnosis

Reference	Diagnosis
G. F. Funston et al. 2020	Oksoko avarsan is a small oviraptorid oviraptorosaur distinguished from other oviraptorosaurs by the following suite of autapomorphies () and other characters: apically thickened, dome-shaped cranial crest composed equally of nasals and frontals (figure 2); nasal recesses housed in a depression; postorbital with dorsally directed frontal process; cervical vertebrae with large epipophyses; functionally didactyl manus ( figure 3); accessory ridge of brevis fossa of ilium; anteriorly curving pubis; and large proximodorsal process of distal tarsal IV.

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: Marsh 1875, Kiessling 2004, Averianov and Yarkov 2004

Age range: Maastrichtian or 72.20000 to 66.00000 Ma

Collections (3 total)

Time interval	Ma	Country or state	Original ID and collection number
Maastrichtian	72.2 - 66.0	Mongolia (Omnogov)	Oksoko avarsan (52008) Oviraptorosauria indet. (type locality: 55257 127670)