Morphological comparisons of metacarpal I for<i>Australovenator wintonensis</i>and<i>Rapator ornitholestoides</i>: implications for their taxonomic relationships

White, Matt A.; Falkingham, Peter L.; Cook, Alex G.; Hocknull, Scott; Elliott, David A.

doi:10.1080/03115518.2013.770221

Cited by 33 publications

(40 citation statements)

References 23 publications

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“…This pattern is also present in all known megaraptorids (Calvo et al, 2004;White et al, 2012White et al, , 2013. However, the distal end of metacarpal I shows some minor distinctions among megaraptorids: in Megaraptor metacarpal I differs from Allosaurus and Australovenator in the presence of a greatly developed lateral distal condyle, which is ventrally wider than in the above mentioned taxa.…”

Section: Comparative Anatomymentioning

confidence: 86%

“…8). In addition, the distal end of metacarpal I in megaraptorids is distally oriented, lacking a medial tilting (Calvo et al, 2004;Agnolin et al, 2010;White et al, 2012White et al, , 2013. This morphology results in a metacarpal I that is distally less asymmetrical than in other theropods, with the exception of derived paravians, including Archaeopteryx, dromaeosaurids and troodontids, in which the distal end lacks the medial twisting present in other theropods (Rauhut, 2003).…”

Section: Comparative Anatomymentioning

confidence: 99%

“…This contrasts with non-coelurosaurian theropods, such as Allosaurus, Acrocanthosaurus, and Xuanhanosaurus, in which the relationship between length:width is 1.52, 1,24 and 1,67 respectively (Madsen, 1976;Dong, 1984;Currie and Carpenter, 2000). In addition, the elongation of metacarpal I is also shared by the Australian "Rapator" (see White et al, 2013). On the other hand, in coelurosaurians like Deinonychus and Guanlong, the ratio is 1,89 and 1,86 respectively (Ostrom, 1076;obs.…”

Section: Comparative Anatomymentioning

confidence: 99%

“…The best known megaraptorids are Megaraptor namunhuaiquii (Novas, 1998;Calvo et al, 2004;Porfiri et al, 2014), Orkoraptor bukei (Novas et al, 2008), and Aerosteon riocoloradensis (Sereno et al, 2008), coming from different formations of Turonian through Santonian age of Argentina; and Australovenator wintonensis (Hocknull et al, 2009;White et al, 2012White et al, , 2013, from Cenomanian rocks of Australia.…”

Section: Introductionmentioning

confidence: 99%

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Phylogenetic relationships of the Cretaceous Gondwanan theropods Megaraptor and Australovenator: the evidence afforded by their manual anatomy

Novas¹,

Rolando²,

Agnolín³

2016

MMV

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General comparisons of the manual elements of megaraptorid theropods are conducted with the aim to enlarge the morphological dataset of phylogenetically useful features within Tetanurae. Distinctive features of Megaraptor are concentrated along the medial side of the manus, with metacarpal I and its corresponding digit being considerably elongated. Manual ungual of digit I is characteristically enlarged in megaraptorids, but it is also transversely compressed resulting in a sharp ventral edge. We recognize two derived characters shared by megaraptorans and coelurosaurs (i.e., proximal end of metacarpal I without a deep and wide groove continuous with the semilunar carpal, and metacarpals I and II long and slender), and one derived trait similar to derived tyrannosauroids (i.e., metacarpal III length <0.75 length of metacarpal II). However, after comparing carpal, metacarpal and phalangeal morphologies, it becomes evident that megaraptorids retained most of the manual features present in Allosaurus. Moreover, Megaraptor and Australovenator are devoid of several manual features that the basal tyrannosauroid Guanlong shares with more derived coelurosaurs (e.g., Deinonychus), thus countering our own previous hypothesis that Megaraptora is well nested within Tyrannosauroidea.

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Section: Comparative Anatomymentioning

confidence: 86%

Section: Comparative Anatomymentioning

confidence: 99%

Section: Comparative Anatomymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Phylogenetic relationships of the Cretaceous Gondwanan theropods Megaraptor and Australovenator: the evidence afforded by their manual anatomy

Novas¹,

Rolando²,

Agnolín³

2016

MMV

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“…Around 600 pages of palaeontological research is published by the journal each year. In 2013, results published by Conran et al (2013), Thulborn (2013) and White et al (2013), among others, were particularly well cited. Alcheringa's reach also continues to grow through the marketing efforts of the publishers.…”

Section: Please Scroll Down For Articlementioning

confidence: 90%

Editorial

McLoughlin¹

2014

Alcheringa: An Australasian Journal of Palaeontology

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Reconstruction of the pectoral girdle and forelimb musculature of Megaraptora (Dinosauria: Theropoda)

Rolando

Novas

Calvo

et al. 2023

The Anatomical Record

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Megaraptora is a group of enigmatic, carnivorous non‐avian theropod dinosaurs from the Cretaceous of Asia, Australia, and especially South America. Perhaps the most striking aspect of megaraptoran morphology is the large, robustly constructed forelimb that, in derived members of the clade, terminates in a greatly enlarged manus with hypertrophied, raptorial unguals on the medialmost two digits and a substantially smaller ungual on digit III. The unique forelimb anatomy of megaraptorans was presumably associated with distinctive functional specializations; nevertheless, its paleobiological significance has not been extensively explored. Here we draw from observations of the pectoral girdle and forelimb skeletons of Megaraptora and myological assessments of other archosaurian taxa to provide a comprehensive reconstruction of the musculature of this anatomical region in these singular theropods. Many muscle attachment sites on megaraptoran forelimb bones are remarkably well developed, which in turn suggests that the muscles themselves were functionally significant and important to the paleobiology of these theropods. Furthermore, many of these attachments became increasingly pronounced through megaraptoran evolutionary history, being substantially better developed in derived taxa such as Australovenator wintonensis and especially Megaraptor namunhuaiquii than in early branching forms such as Fukuiraptor kitadaniensis. When considered alongside previous range of motion hypotheses for Australovenator, our results indicate that megaraptorans possessed a morphologically and functionally specialized forelimb that was capable of complex movements. Notable among these were extensive extension and flexion, particularly in the highly derived manus, as well as enhanced humeral protraction, attributes that very probably aided in prey capture.

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Morphological comparisons of metacarpal I forAustralovenator wintonensisandRapator ornitholestoides: implications for their taxonomic relationships

Cited by 33 publications

References 23 publications

Phylogenetic relationships of the Cretaceous Gondwanan theropods Megaraptor and Australovenator: the evidence afforded by their manual anatomy

Phylogenetic relationships of the Cretaceous Gondwanan theropods Megaraptor and Australovenator: the evidence afforded by their manual anatomy

Editorial

Reconstruction of the pectoral girdle and forelimb musculature of Megaraptora (Dinosauria: Theropoda)

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