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Bonapartenykus ultimus

Reptilia - Avetheropoda - Alvarezsauridae

Taxonomy
Bonapartenykus ultimus was named by Agnolin et al. (2012) [Alvarezsaurid theropod diagnosable on the basis of the following autapomorphies: (1) mid-dorsal vertebrae with spinopostzygapophyseal laminae ending abruptly above the postzygapophyses; (2) ventral portion of coracoid strongly medially deflected and decorated with delicate but profuse grooves (convergently acquired with Xixianykus); (3) fused scapulocoracoids (convergently acquired with Ceratonykus); (4) scapula with a very wide notch on the posterior margin of the bone; and (5) ilium and pubis fused.]. Its type specimen is MPCA 1290, a partial skeleton, and it is a 3D body fossil. Its type locality is Salitral Ojo de Agua (general), which is in a Campanian/Maastrichtian fluvial sandstone in the Allen Formation of Argentina. It is the type species of Bonapartenykus.

Synonymy list
YearName and author
2012Bonapartenykus ultimus Agnolin et al. p. 35 figs. 2-7

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
Romeriida
Diapsida()
Eosuchia()
Neodiapsida
RankNameAuthor
SauriaGauthier 1984
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Theropoda()
Neotheropoda
AverostraPaul 2002
Tetanurae
orderAvetheropoda
suborderCoelurosauria
Maniraptora
familyAlvarezsauridae
subfamilyPatagonykinae
genusBonapartenykus
speciesultimus

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.

Diagnosis
ReferenceDiagnosis
F. L. Agnolin et al. 2012Alvarezsaurid theropod diagnosable on the basis of the following autapomorphies: (1) mid-dorsal vertebrae with spino-postzygapophyseal laminae ending abruptly above the postzygapophyses; (2) ventral portion of coracoid strongly medially deflected and decorated with delicate but profuse grooves (convergently acquired with Xixianykus); (3) fused scapulocoracoids (convergently acquired with Ceratonykus); (4) scapula with a very wide notch on the posterior margin of the bone; and (5) ilium and pubis fused.
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
Architecture: compact or denseo
Ontogeny: accretion, modification of partso
Grouping: solitaryo
Environment: terrestrialo
Locomotion: actively mobileo
Life habit: ground dwellingo
Diet: carnivoresubo
Reproduction: oviparouso
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2009-01-03 20:39:15
Modified: 2009-01-03 22:39:15
Source: subo = suborder, o = order
References: Kiessling 2004, Benton 1983, Marsh 1875

Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma

Collections (2 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Campanian - Early/Lower Maastrichtian83.5 - 66.0Argentina (Río Negro) Bonapartenykus ultimus (type locality: 28459)
Middle Campanian - Early/Lower Maastrichtian83.5 - 66.0Argentina (Río Negro) Alvarezsauridae indet. (95694)