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Analysis of Triassic archosauriform trackways; difference in stride/foot ratio between dinosauromorphs and other archosauriforms

Tai Kubo and Mugino O. Kubo
Analysis of Triassic archosauriform trackways; difference in stride/foot ratio between dinosauromorphs and other archosauriforms
Palaios (April 2013) 28 (4): 259-265

Abstract

Fossilized trackways have rarely been analyzed quantitatively to examine major trends and patterns in evolution despite their potential utility, especially in understanding locomotory evolution. In the present study, trackways of Triassic archosauriforms were analyzed. The analyses showed foot and stride lengths of archosauriforms increased from the Early to Middle Triassic, especially those of dinosauromorphs, which tripled. Dinosauromorphs were much smaller in foot length and stride length compared to other archosauriforms during the Early Triassic. They reached similar stride length compared with other archosauriforms during the Middle Triassic and similar foot length in the Late Triassic. Stride/foot ratio is significantly higher in dinosauromorphs compared to other archosauriforms throughout the Triassic. This relatively long stride length of dinosauromorphs is attributed to either faster speed or higher relative hip height that was probably caused by their digitigrade foot posture. Analyses of trackway data sets, especially in combination with precise trackmaker assignment and age determination, would bring us more thorough knowledge about locomotory evolution of tetrapods that complements body fossil evidence.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 28
Serial Issue: 4
Title: Analysis of Triassic archosauriform trackways; difference in stride/foot ratio between dinosauromorphs and other archosauriforms
Affiliation: Fukui Prefectural Dinosaur Museum, Katsuyama, Japan
Pages: 259-265
Published: 201304
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 42
Accession Number: 2013-047943
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: University of Tokyo, JPN, Japan
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201330
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