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Diamantinasaurus matildae

Reptilia

Taxonomy
Diamantinasaurus matildae was named by Hocknull et al. (2009). Its type specimen is AODF 603, a set of postcrania, and it is a 3D body fossil. Its type locality is Matilda Site, Elderslie Station (AODL 0085), which is in a Cenomanian fine channel fill claystone/sandstone in the Winton Formation of Australia. It is the type species of Diamantinasaurus.

Synonymy list
YearName and author
2009Diamantinasaurus matildae Hocknull et al. p. 4 figs. 2A, B, 3-12
2011Diamantinasaurus matildae Grellet-Tinner et al. p. 625
2011Diamantinasaurus matildae Molnar p. 305
2012Diamantinasaurus matildae D'Emic
2012Diamantinasaurus matildae White et al. p. 1
2013Diamantinasaurus matildae Tschopp and Mateus p. 332
2015Diamantinasaurus matildae Poropat et al.
2016Diamantinasaurus matildae Salisbury et al. p. 125
2017Diamantinasaurus matildae Gorscak et al. p. 11
2020Diamantinasaurus matildae Poropat et al. p. 1
2021Diamantinasaurus matildae Frauenfelder et al. p. 354
2021Diamantinasaurus matildae Poropat et al.
2021Diamantinasaurus matildae Poropat et al. p. 32
2021Diamantinasaurus matildae Rigby et al. p. 3
2022Diamantinasaurus matildae Navarro et al. p. 341
2023Diamantinasaurus matildae Poropat et al. p. 7–8

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Life
Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda
Reptiliomorpha
Anthracosauria
subclassAmphibiosauriaKuhn 1967
Cotylosauria()
Amniota
Sauropsida
classReptilia
subclassEureptilia()
RankNameAuthor
Romeriida
Diapsida()
Archosauromorpha(Huene 1946)
Crocopoda
ArchosauriformesGauthier 1986
Eucrocopoda
Archosauria()
informalAvemetatarsalia
Ornithodira
Dinosauromorpha
Dinosauriformes
Dinosauria()
Saurischia()
Sauropoda()
Titanosauria
Eutitanosauria
Saltasauroidea(Powell 1992)
Diamantinasauria
genusDiamantinasaurus
speciesmatildae

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.

Diamantinasaurus matildae Hocknull et al. 2009
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Diagnosis
ReferenceDiagnosis
S. A. Hocknull et al. 2009Diamantinasaurus matildae gen. et sp. nov. is characterised by the following unique association of features. Dorsal ribs plank-like with camellate pneumatic cavities in the proximal-most expansion. Transverse processes of the sacral vertebrae with camellate pneumatic cavities. Scapular glenoid bevelled medially and expanded medio-laterally; scapular blade flat and rectangular in cross-section; acromial blade broad and dish-shaped with poorly developed acromial ridge. Crescentic-shaped sternal plate. Humerus stout; intermediate robusticity (autapomorphic); deltopectoral crest prominent, extending to mid-shaft; proximal border shallowly sigmoidal; proximo-lateral corner square; distal condyles merged and flat extending only just onto anterior face of shaft; proximal breadth 50% of total length. Ulna stout; cranio-medial process massive and concave; distal condyle ovo-triangular. Metacarpals massive with undivided condyles and marked distal rugosities; Mc III longest followed by Mc II, Mc I, Mc IV and Mc V; phalangeal articular facets on external face of shaft on Mc I–IV. Phalanges present on digits I–IV (phalangeal formula 2-1-1-1-0); spike-like ungual present on digit I. Phalanges on digits II–IV rounded and broadest transversely; Mc III phalange heavily reduced (autapomorphic). Ilium massive with broad rounded preacetabular lobe directed perpendicular to sacral axis; pneumatic cavities present within iliac blade. Pubes massive and long, fused to ischia via a shallowly sigmoidal pubic apron. Ischia with distinct iliac peduncle on a narrow shaft leading to a broad ischial blade, which is fused to the opposite ischium along the mid-line of the pelvic girdle. Femur robust with lateral bulge; intermediate robusticity (autapomorphic); distal condyles bevelled dorso-medially; shaft elliptical in cross-section and deflected medially. Tibia robust; proximal articular condyle sub-equally expanded; cnemial crest projects cranially then laterally (autapomorphic); ovoid distal articular surface; distal breadth more than twice that of mid-shaft. Fibula expanded proximally; intermediate robusticity (autapomorphic); distal articular surface bevelled cranio-medially. Astragalus quadrangular; posterior fossa undivided.
S. L. Rigby et al. 2021To the diagnosis of Diamantinasaurus matildae presented by Poropat et al. (2021a), we append one local autapomorphy: scapula medial surface with distinct tuberosity just posterior to the junction of the acromion and the distal blade (also identified by Hocknull et al., 2021).
S. F. Poropat et al. 2023Newly identified diagnostic characteristics
Quadratojugal and quadrate with horizontal ridge present across both elements anterior to their articulation point (lateral surface of quadrate, medial surface of quadratojugal).
Measurements
No measurements are available
Composition: hydroxyapatiteinfrao
Entire body: yesinfrao
Adult length: 10 to < 100infrao
Adult width: 10 to < 100infrao
Adult height: 10 to < 100infrao
Thickness: thickinfrao
Architecture: compact or denseinfrao
Form: sphericalinfrao
Ontogeny: accretion, modification of partsinfrao
Grouping: gregariousinfrao
Environment: terrestrialinfrao
Locomotion: actively mobileinfrao
Life habit: ground dwellinginfrao
Diet: herbivoreinfrao
Reproduction: oviparousinfrao
Dispersal: direct/internalinfrao
Dispersal 2: mobileinfrao
Created: 2004-12-14 12:49:10
Modified: 2004-12-14 14:49:10
Source: infrao = infraorder
Reference: Marsh 1875

Age range: Late/Upper Cenomanian or 99.60000 to 93.50000 Ma

Collections (4 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Cenomanian99.6 - 93.5Australia (Queensland) Diamantinasaurus matildae (type locality: 90140 225325 229882)
Late/Upper Cenomanian - Early/Lower Turonian99.6 - 89.3Australia (Queensland) Austrosaurus sp. (62553)