Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.

<h4>Background</h4>Fossil tracks made by non-avian theropod dinosaurs commonly reflect the habitual bipedal stance retained in living birds. Only rarely-captured behaviors, such as crouching, might create impressions made by the hands. Such tracks provide valuable information concerning...

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Autores principales:	Andrew R C Milner, Jerald D Harris, Martin G Lockley, James I Kirkland, Neffra A Matthews
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2009
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8ffbf5608c204e79bfa88256b3a48b59
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spelling	oai:doaj.org-article:8ffbf5608c204e79bfa88256b3a48b592021-11-25T06:16:59ZBird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.1932-620310.1371/journal.pone.0004591https://doaj.org/article/8ffbf5608c204e79bfa88256b3a48b592009-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/19259260/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Fossil tracks made by non-avian theropod dinosaurs commonly reflect the habitual bipedal stance retained in living birds. Only rarely-captured behaviors, such as crouching, might create impressions made by the hands. Such tracks provide valuable information concerning the often poorly understood functional morphology of the early theropod forelimb.<h4>Methodology/principal findings</h4>Here we describe a well-preserved theropod trackway in a Lower Jurassic ( approximately 198 million-year-old) lacustrine beach sandstone in the Whitmore Point Member of the Moenave Formation in southwestern Utah. The trackway consists of prints of typical morphology, intermittent tail drags and, unusually, traces made by the animal resting on the substrate in a posture very similar to modern birds. The resting trace includes symmetrical pes impressions and well-defined impressions made by both hands, the tail, and the ischial callosity.<h4>Conclusions/significance</h4>The manus impressions corroborate that early theropods, like later birds, held their palms facing medially, in contrast to manus prints previously attributed to theropods that have forward-pointing digits. Both the symmetrical resting posture and the medially-facing palms therefore evolved by the Early Jurassic, much earlier in the theropod lineage than previously recognized, and may characterize all theropods.Andrew R C MilnerJerald D HarrisMartin G LockleyJames I KirklandNeffra A MatthewsPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 4, Iss 3, p e4591 (2009)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Andrew R C Milner Jerald D Harris Martin G Lockley James I Kirkland Neffra A Matthews Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.
description	<h4>Background</h4>Fossil tracks made by non-avian theropod dinosaurs commonly reflect the habitual bipedal stance retained in living birds. Only rarely-captured behaviors, such as crouching, might create impressions made by the hands. Such tracks provide valuable information concerning the often poorly understood functional morphology of the early theropod forelimb.<h4>Methodology/principal findings</h4>Here we describe a well-preserved theropod trackway in a Lower Jurassic ( approximately 198 million-year-old) lacustrine beach sandstone in the Whitmore Point Member of the Moenave Formation in southwestern Utah. The trackway consists of prints of typical morphology, intermittent tail drags and, unusually, traces made by the animal resting on the substrate in a posture very similar to modern birds. The resting trace includes symmetrical pes impressions and well-defined impressions made by both hands, the tail, and the ischial callosity.<h4>Conclusions/significance</h4>The manus impressions corroborate that early theropods, like later birds, held their palms facing medially, in contrast to manus prints previously attributed to theropods that have forward-pointing digits. Both the symmetrical resting posture and the medially-facing palms therefore evolved by the Early Jurassic, much earlier in the theropod lineage than previously recognized, and may characterize all theropods.
format	article
author	Andrew R C Milner Jerald D Harris Martin G Lockley James I Kirkland Neffra A Matthews
author_facet	Andrew R C Milner Jerald D Harris Martin G Lockley James I Kirkland Neffra A Matthews
author_sort	Andrew R C Milner
title	Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.
title_short	Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.
title_full	Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.
title_fullStr	Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.
title_full_unstemmed	Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.
title_sort	bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.
publisher	Public Library of Science (PLoS)
publishDate	2009
url	https://doaj.org/article/8ffbf5608c204e79bfa88256b3a48b59
work_keys_str_mv	AT andrewrcmilner birdlikeanatomypostureandbehaviorrevealedbyanearlyjurassictheropoddinosaurrestingtrace AT jeralddharris birdlikeanatomypostureandbehaviorrevealedbyanearlyjurassictheropoddinosaurrestingtrace AT martinglockley birdlikeanatomypostureandbehaviorrevealedbyanearlyjurassictheropoddinosaurrestingtrace AT jamesikirkland birdlikeanatomypostureandbehaviorrevealedbyanearlyjurassictheropoddinosaurrestingtrace AT neffraamatthews birdlikeanatomypostureandbehaviorrevealedbyanearlyjurassictheropoddinosaurrestingtrace
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Bird-like anatomy, posture, and behavior revealed by an early jurassic theropod dinosaur resting trace.

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