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 original | English |
|---|---|
| Páginas (desde-hasta) | 567-575 |
| Número de páginas | 9 |
| Publicación | Ameghiniana |
| Volumen | 54 |
| N.º | 5 |
| DOI | |
| Estado | Published - 1 ene 2017 |
Huella dactilar
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Palaeontology
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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.
AB - 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.
KW - Flexion
KW - Flight evolution
KW - Forelimb resting posture
KW - Soft tissue
UR - http://www.scopus.com/inward/record.url?scp=85048808407&partnerID=8YFLogxK
U2 - 10.5710/AMGH.11.06.2017.3088
DO - 10.5710/AMGH.11.06.2017.3088
M3 - Review article
AN - SCOPUS:85048808407
VL - 54
SP - 567
EP - 575
JO - Ameghiniana
JF - Ameghiniana
SN - 0002-7014
IS - 5
ER -