Forelimb posture in chilesaurus diegosuarezi (dinosauria, theropoda) and its behavioral and phylogenetic implications

Nicolás R. Chimento, Federico L. Agnolin, Fernando E. Novas, Martín D. Ezcurra, Leonardo Salgado, Marcelo P. Isasi, Manuel Suarez, Rita De La Cruz, David Rubilar-Rogers, Alexander O. Vargas

Resultado de la investigación: Review article

1 Cita (Scopus)

Resumen

Many dinosaur skeletons show evidence of behavior, including feeding, predation, nesting, and parental care. The resting posture of the forelimbs has been studied in some theropod species, in relation to the acquisition of flight in advanced maniraptoran theropods. Chilesaurus diegosuarezi is a bizarre tetanuran recently described from the Toqui Formation (latest Tithonian) of southern Chile that is represented by multiple well-preserved and articulated specimens. The aim of the present work is to analyze the forelimb posture of four articulated specimens of Chilesaurus diegosuarezi, focusing on its anatomical description, and phylogenetic and behavioral implications. All the preserved specimens show strongly ventrally flexed arms with the hands oriented backwards, an arrangement that closely resembles those in dinosaur specimens previously described as preserving resting posture, such as Mei long, Sinornithoides youngi and Albinykus baatar. As a result, it seems that individuals of Chilesaurus diegosuarezi have been in passive activity (e.g. feeding, resting) when they were buried quickly, allowing their fossilization in life position and preserving the forelimb resting posture. The arrangement of the forelimb bones in Chilesaurus could show the first evidences of the structures linked to the muscles that flex the forearms, features related with the acquisition of flying control in advanced maniraptorans.

Idioma originalEnglish
Páginas (desde-hasta)567-575
Número de páginas9
PublicaciónAmeghiniana
Volumen54
N.º5
DOI
EstadoPublished - 1 ene 2017

Huella dactilar

posture
forelimbs
phylogenetics
phylogeny
dinosaur
flight
fossilization
Tithonian
parental care
feeding behavior
skeleton
Chile
bone
muscle
hands
predation
bones
muscles
dinosaurs

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology

Citar esto

Chimento, N. R., Agnolin, F. L., Novas, F. E., Ezcurra, M. D., Salgado, L., Isasi, M. P., ... Vargas, A. O. (2017). Forelimb posture in chilesaurus diegosuarezi (dinosauria, theropoda) and its behavioral and phylogenetic implications. Ameghiniana, 54(5), 567-575. https://doi.org/10.5710/AMGH.11.06.2017.3088
Chimento, Nicolás R. ; Agnolin, Federico L. ; Novas, Fernando E. ; Ezcurra, Martín D. ; Salgado, Leonardo ; Isasi, Marcelo P. ; Suarez, Manuel ; De La Cruz, Rita ; Rubilar-Rogers, David ; Vargas, Alexander O. / Forelimb posture in chilesaurus diegosuarezi (dinosauria, theropoda) and its behavioral and phylogenetic implications. En: Ameghiniana. 2017 ; Vol. 54, N.º 5. pp. 567-575.
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title = "Forelimb posture in chilesaurus diegosuarezi (dinosauria, theropoda) and its behavioral and phylogenetic implications",
abstract = "Many dinosaur skeletons show evidence of behavior, including feeding, predation, nesting, and parental care. The resting posture of the forelimbs has been studied in some theropod species, in relation to the acquisition of flight in advanced maniraptoran theropods. Chilesaurus diegosuarezi is a bizarre tetanuran recently described from the Toqui Formation (latest Tithonian) of southern Chile that is represented by multiple well-preserved and articulated specimens. The aim of the present work is to analyze the forelimb posture of four articulated specimens of Chilesaurus diegosuarezi, focusing on its anatomical description, and phylogenetic and behavioral implications. All the preserved specimens show strongly ventrally flexed arms with the hands oriented backwards, an arrangement that closely resembles those in dinosaur specimens previously described as preserving resting posture, such as Mei long, Sinornithoides youngi and Albinykus baatar. As a result, it seems that individuals of Chilesaurus diegosuarezi have been in passive activity (e.g. feeding, resting) when they were buried quickly, allowing their fossilization in life position and preserving the forelimb resting posture. The arrangement of the forelimb bones in Chilesaurus could show the first evidences of the structures linked to the muscles that flex the forearms, features related with the acquisition of flying control in advanced maniraptorans.",
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Chimento, NR, Agnolin, FL, Novas, FE, Ezcurra, MD, Salgado, L, Isasi, MP, Suarez, M, De La Cruz, R, Rubilar-Rogers, D & Vargas, AO 2017, 'Forelimb posture in chilesaurus diegosuarezi (dinosauria, theropoda) and its behavioral and phylogenetic implications', Ameghiniana, vol. 54, n.º 5, pp. 567-575. https://doi.org/10.5710/AMGH.11.06.2017.3088

Forelimb posture in chilesaurus diegosuarezi (dinosauria, theropoda) and its behavioral and phylogenetic implications. / Chimento, Nicolás R.; Agnolin, Federico L.; Novas, Fernando E.; Ezcurra, Martín D.; Salgado, Leonardo; Isasi, Marcelo P.; Suarez, Manuel; De La Cruz, Rita; Rubilar-Rogers, David; Vargas, Alexander O.

En: Ameghiniana, Vol. 54, N.º 5, 01.01.2017, p. 567-575.

Resultado de la investigación: Review article

TY - JOUR

T1 - Forelimb posture in chilesaurus diegosuarezi (dinosauria, theropoda) and its behavioral and phylogenetic implications

AU - Chimento, Nicolás R.

AU - Agnolin, Federico L.

AU - Novas, Fernando E.

AU - Ezcurra, Martín D.

AU - Salgado, Leonardo

AU - Isasi, Marcelo P.

AU - Suarez, Manuel

AU - De La Cruz, Rita

AU - Rubilar-Rogers, David

AU - Vargas, Alexander O.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - Many dinosaur skeletons show evidence of behavior, including feeding, predation, nesting, and parental care. The resting posture of the forelimbs has been studied in some theropod species, in relation to the acquisition of flight in advanced maniraptoran theropods. Chilesaurus diegosuarezi is a bizarre tetanuran recently described from the Toqui Formation (latest Tithonian) of southern Chile that is represented by multiple well-preserved and articulated specimens. The aim of the present work is to analyze the forelimb posture of four articulated specimens of Chilesaurus diegosuarezi, focusing on its anatomical description, and phylogenetic and behavioral implications. All the preserved specimens show strongly ventrally flexed arms with the hands oriented backwards, an arrangement that closely resembles those in dinosaur specimens previously described as preserving resting posture, such as Mei long, Sinornithoides youngi and Albinykus baatar. As a result, it seems that individuals of Chilesaurus diegosuarezi have been in passive activity (e.g. feeding, resting) when they were buried quickly, allowing their fossilization in life position and preserving the forelimb resting posture. The arrangement of the forelimb bones in Chilesaurus could show the first evidences of the structures linked to the muscles that flex the forearms, features related with the acquisition of flying control in advanced maniraptorans.

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KW - Flexion

KW - Flight evolution

KW - Forelimb resting posture

KW - Soft tissue

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