Dinosaur origins: Evidence from the footprint record

Triassic tracks and trackways assigned to dinosaur trackmakers or closest relatives have been mentioned from several Middle to the latest Triassic successions from both northern and southern Pangea. At present, the earliest gondwanan records are those from the Middle Triassic Los Rastros Formation i...

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Autores principales:	Marsicano, Claudia Alicia, Domnanovich, Nadia Sonia, Mancuso, Adriana Cecilia
Publicado:	2007
Materias:	Argentina Dinosauria Footprints Los Rastros Formation Triassic dinosaur footprint fossil record ichnology trackway South America Ornithischia Saurischia Theropoda
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08912963_v19_n1_p83_Marsicano http://hdl.handle.net/20.500.12110/paper_08912963_v19_n1_p83_Marsicano
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_08912963_v19_n1_p83_Marsicano
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spelling	paper:paper_08912963_v19_n1_p83_Marsicano2023-06-08T15:47:10Z Dinosaur origins: Evidence from the footprint record Marsicano, Claudia Alicia Domnanovich, Nadia Sonia Mancuso, Adriana Cecilia Argentina Dinosauria Footprints Los Rastros Formation Triassic dinosaur footprint fossil record ichnology trackway Triassic Argentina South America Dinosauria Ornithischia Saurischia Theropoda Triassic tracks and trackways assigned to dinosaur trackmakers or closest relatives have been mentioned from several Middle to the latest Triassic successions from both northern and southern Pangea. At present, the earliest gondwanan records are those from the Middle Triassic Los Rastros Formation in west-central Argentina. A reanalysis of Los Rastros ichnites at the Ischichuca area, including new material, has revealed the presence of a more diverse ichnofauna than previously suspected. The ichnocoenosis includes several tracks and trackways of bipeds with functionally tridactyl digitigrade pes, well developed claws, and a parasagittal posture of the hindlimbs. Previously, some large tridactyl footprints from the Ischichuca area were allied to theropod dinosaurs, although no synapomophies are preserved in the three-toed footprints that might discriminate among theropods, basal saurischians and basal ornithischian groups as their possible trackmakers. If the Ischichuca trackmakers are referred to a dinosaur taxon and/or to a close dinosaur sister-taxon, their presence in the Los Rastros levels suggests that derived dinosauriforms (including dinosaurs) had diverged and acquired their characteristic functionally tridactyl pes by at least the Middle Triassic, something that the body-fossil record has failed to document to date. Fil:Marsicano, C.A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Domnanovich, N.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mancuso, A.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08912963_v19_n1_p83_Marsicano http://hdl.handle.net/20.500.12110/paper_08912963_v19_n1_p83_Marsicano
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Argentina Dinosauria Footprints Los Rastros Formation Triassic dinosaur footprint fossil record ichnology trackway Triassic Argentina South America Dinosauria Ornithischia Saurischia Theropoda
spellingShingle	Argentina Dinosauria Footprints Los Rastros Formation Triassic dinosaur footprint fossil record ichnology trackway Triassic Argentina South America Dinosauria Ornithischia Saurischia Theropoda Marsicano, Claudia Alicia Domnanovich, Nadia Sonia Mancuso, Adriana Cecilia Dinosaur origins: Evidence from the footprint record
topic_facet	Argentina Dinosauria Footprints Los Rastros Formation Triassic dinosaur footprint fossil record ichnology trackway Triassic Argentina South America Dinosauria Ornithischia Saurischia Theropoda
description	Triassic tracks and trackways assigned to dinosaur trackmakers or closest relatives have been mentioned from several Middle to the latest Triassic successions from both northern and southern Pangea. At present, the earliest gondwanan records are those from the Middle Triassic Los Rastros Formation in west-central Argentina. A reanalysis of Los Rastros ichnites at the Ischichuca area, including new material, has revealed the presence of a more diverse ichnofauna than previously suspected. The ichnocoenosis includes several tracks and trackways of bipeds with functionally tridactyl digitigrade pes, well developed claws, and a parasagittal posture of the hindlimbs. Previously, some large tridactyl footprints from the Ischichuca area were allied to theropod dinosaurs, although no synapomophies are preserved in the three-toed footprints that might discriminate among theropods, basal saurischians and basal ornithischian groups as their possible trackmakers. If the Ischichuca trackmakers are referred to a dinosaur taxon and/or to a close dinosaur sister-taxon, their presence in the Los Rastros levels suggests that derived dinosauriforms (including dinosaurs) had diverged and acquired their characteristic functionally tridactyl pes by at least the Middle Triassic, something that the body-fossil record has failed to document to date.
author	Marsicano, Claudia Alicia Domnanovich, Nadia Sonia Mancuso, Adriana Cecilia
author_facet	Marsicano, Claudia Alicia Domnanovich, Nadia Sonia Mancuso, Adriana Cecilia
author_sort	Marsicano, Claudia Alicia
title	Dinosaur origins: Evidence from the footprint record
title_short	Dinosaur origins: Evidence from the footprint record
title_full	Dinosaur origins: Evidence from the footprint record
title_fullStr	Dinosaur origins: Evidence from the footprint record
title_full_unstemmed	Dinosaur origins: Evidence from the footprint record
title_sort	dinosaur origins: evidence from the footprint record
publishDate	2007
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_08912963_v19_n1_p83_Marsicano http://hdl.handle.net/20.500.12110/paper_08912963_v19_n1_p83_Marsicano
work_keys_str_mv	AT marsicanoclaudiaalicia dinosauroriginsevidencefromthefootprintrecord AT domnanovichnadiasonia dinosauroriginsevidencefromthefootprintrecord AT mancusoadrianacecilia dinosauroriginsevidencefromthefootprintrecord
_version_	1768542321066901504

Dinosaur origins: Evidence from the footprint record

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