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Imperobator antarcticus

Reptilia - Dromaeosauridae

Taxonomy
Imperobator antarcticus was named by Ely and Case (2019). Its type specimen is UCMP 276000, a set of postcrania (Fragmented left pes and other smaller fragments from the right pes. Pedal material preserved includes: the distal portion of the tibia; an incomplete astragalus), and it is a 3D body fossil. Its type locality is UCMP Locality RV-9502, The Naze, James Ross Island, which is in a Maastrichtian marginal marine sandstone/mudstone in the Snow Hill Island Formation of Antarctica.

Synonymy list
YearName and author
2019Imperobator antarcticus Ely and Case
2023Imperobator antarcticus Davis et al.

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

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.

†Imperobator antarcticus Ely and Case 2019
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Diagnosis
ReferenceDiagnosis
R. C. Ely and J. A. Case 2019The following traits are unique to Imperobator: fusion of the fibula and calcaneum; parallelogram-outline of metatarsal II cross section; metatarsal II medial slanting where the diaphysis terminates (pathological?). Following traits are non-diagnostic, but represent unusual traits important for referral of the described taxon as non-dromaeosaurid: distal articular surface of metatarsal II non-ginglymoid; ungual phalanx of second pedal digit small and without strong curvature, contrary to the condition seen in eudromaeosaurs (likely a plesiomorphy of more basal coelurosaurs).
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: terrestrialf
Locomotion: actively mobileo
Life habit: ground dwellingf
Diet: carnivoref
Reproduction: oviparousf
Dispersal: direct/internalo
Dispersal 2: mobileo
Created: 2005-09-11 17:04:18
Modified: 2005-09-11 19:04:18
Source: f = family, o = order
References: Marsh 1875, Holtz et al. 2000

Age range: Early/Lower Maastrichtian or 70.60000 to 66.00000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Early/Lower Maastrichtian70.6 - 66.0Antarctica Dromaeosauridae indet. (type locality: 75458)