Furculae in the Late Triassic theropod dinosaurCoelophysis bauri

Rinehart, Larry F.; Lucas, Spencer G.; Hunt, Adrian P.

doi:10.1007/bf02988391

Cited by 14 publications

(18 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although there is no furcula preserved in Tawa , furculae are known for many theropods including Coelophysis (Rinehart et al. ; Nesbitt et al. ), and so the origin of Deltoideus clavicularis is reconstructed as extending onto the hypothetical furcula in this taxon.…”

Section: Resultsmentioning

confidence: 98%

“…In birds, this muscle also originates from the dorsal surface of the furcula (clavicle), and this area of origin is also present in lepidosaurs (Jasinoski et al 2006), suggesting that it has been independently lost in modern crocodylians. Although there is no furcula preserved in Tawa, furculae are known for many theropods including Coelophysis (Rinehart et al 2007;Nesbitt et al 2009b), and so the origin of Deltoideus clavicularis is reconstructed as extending onto the hypothetical furcula in this taxon.…”

Section: Deltoideus Clavicularis (Dc)mentioning

confidence: 98%

See 1 more Smart Citation

Complete forelimb myology of the basal theropod dinosaur Tawa hallae based on a novel robust muscle reconstruction method

Burch

2014

Journal of Anatomy

784

View full text Add to dashboard Cite

The forelimbs of nonavian theropod dinosaurs have been the subject of considerable study and speculation due to their varied morphology and role in the evolution of flight. Although many studies on the functional morphology of a limb require an understanding of its musculature, comparatively little is known about the forelimb myology of theropods and other bipedal dinosaurs. Previous phylogenetically based myological reconstructions have been limited to the shoulder, restricting their utility in analyses of whole-limb function. The antebrachial and manual musculature in particular have remained largely unstudied due to uncertain muscular homologies in archosaurs. Through analysis of the musculature of extant taxa in a robust statistical framework, this study presents new hypotheses of homology for the distal limb musculature of archosaurs and provides the first complete reconstruction of dinosaurian forelimb musculature, including the antebrachial and intrinsic manual muscles. Data on the forelimb myology of a broad sample of extant birds, crocodylians, lizards, and turtles were analyzed using maximum likelihood ancestral state reconstruction and examined together with the osteology of the early theropod Tawa hallae from the Late Triassic of New Mexico to formulate a complete plesiomorphic myology for the theropod forelimb. Comparisons with previous reconstructions show that the shoulder musculature of basal theropods is more similar to that of basal ornithischians and sauropodomorphs than to that of dromaeosaurids. Greater development of the supracoracoideus and deltoideus musculature in theropods over other bipedal dinosaurs correlates with stronger movements of the forelimb at the shoulder and an emphasis on apprehension of relatively large prey. This emphasis is further supported by the morphology of the antebrachium and the intrinsic manual musculature, which exhibit a high degree of excursion and a robust morphology well-suited for powerful digital flexion. The forelimb myology of Tawa established here helps infer the ancestral conformation of the forelimb musculature and the osteological correlates of major muscle groups in early theropods. These data are critical for investigations addressing questions relating to the evolution of specialized forelimb function across Theropoda.

show abstract

Section: Resultsmentioning

confidence: 98%

Section: Deltoideus Clavicularis (Dc)mentioning

confidence: 98%

Complete forelimb myology of the basal theropod dinosaur Tawa hallae based on a novel robust muscle reconstruction method

Burch

2014

Journal of Anatomy

784

View full text Add to dashboard Cite

show abstract

“…The clavicles of some nonsauropod sauropodomorphs (e.g., Massospondylus) may contact each other at the midline, but do not fuse (Yates and Vasconcelos, 2005). A furcula (5 fused clavicles) is present in nearly all theropods known from complete skeletons including Coelophysis bauri (AMNH FR 30647; Rinehart et al, 2007;Nesbitt et al, 2009d) and Allosaurus fragilis (UUVP 6102; Chure and Madsen, 1996). This character has been employed by various datasets exploring theropod relationships (e.g., Norell et al, 2001;Clarke, 2004).…”

Section: Pectoral Girdlementioning

confidence: 99%

The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades

Nesbitt

2011

Bulletin of the American Museum of Natural History

746

2,561

View full text Add to dashboard Cite

“…Bone fragments are abundant in coprolites (fossil feces) attributable to theropod dinosaurs, and reach a half of the total volume of the fecal matter and centimetric dimensions, as seen in feces produced by coelophysids (Rinehart et al 2005), allosaurids/ceratosaurids (Stone et al 2000;Chin and Bishop 2007) and tyrannosaurids (Chin et al 1998(Chin et al , 2003. These characteristics are typical of excrements of modern felids and canids (Brönnimann et al 2017).…”

Section: Digestion In Dinosaurs and Early Birdsmentioning

confidence: 99%

Comparative digestive physiology of archosaurs with notes on bird origins

Bajdek

2018

Preprint

View full text Add to dashboard Cite

It is widely accepted that birds evolved from theropod dinosaurs, and few paleontologists disagree preferring a more ancient split of the avian and dinosaur lineages. The difference in digestive physiology between members of the theropod and crocodile lineages, documented by fossil feces and gut contents, offers an opportunity to test these phylogenetic hypotheses. Birds share with crocodiles the functional gizzard that contains swallowed stones and where gastric pellets are formed before regurgitation, as well as a mechanism that prevents the passage of indigestible residues into the intestine. Both these adaptations are missing in unquestionable theropod groups (compsognathids, tyrannosaurids, allosaurids, coelophysids). The theropod ancestry of birds implies reappearance and strong development of a specific stomach functionality that either had been already lost in the theropod dinosaurs or was never present in their lineage. Coprolites of early archosaurs contain undigested bones, which suggests a short digestion time and higher metabolic rates than in extant crocodiles. Early archosaurs were similar to birds, but not to dinosaurs, in all these aspects of physiology.

show abstract

Furculae in the Late Triassic theropod dinosaurCoelophysis bauri

Cited by 14 publications

References 8 publications

Complete forelimb myology of the basal theropod dinosaur Tawa hallae based on a novel robust muscle reconstruction method

Complete forelimb myology of the basal theropod dinosaur Tawa hallae based on a novel robust muscle reconstruction method

The Early Evolution of Archosaurs: Relationships and the Origin of Major Clades

Comparative digestive physiology of archosaurs with notes on bird origins

Contact Info

Product

Resources

About