First occurrence of a Middle Triassic tetrapod ichnofauna from the Argana Basin (Western High Atlas, Morocco)

The First Silesaurid Dinosauriform from the Late Triassic of Morocco

“…The presence of dinosauromorphs in the Timezga− diouine Formation was previously suggested based on foot− prints (Klein et al 2011), but this is the first definitive record of silesaurids from the region. This record provides further evidence for the cosmopolitanism of basal dinosauromorphs (and silesaurids in particular) in the Middle−to−Late Triassic.…”

Trackways of the American Crocodile (Crocodylus acutus) in Northwestern Costa Rica: Implications for Crocodylian Ichnology

“…Comparisons of fossil trackways of quadrupedal archosaurs besides crocodylians (e.g. Klein, 2000, 2002;Lockley and Meyer, 2000;Rainforth, 2003;Gand et al, 2007;Porchetti and Nicosia, 2007;Romano et al, 2007;Avanzini and Petti, 2008;Lockley et al, 2009;Marty et al, 2010;Petti et al, 2010;Klein et al, 2011;Li et al, 2012;Contessi, 2013;Boutakiout et al, 2014;Masrour and Pérez-Lorente, 2014;McCrea et al, 2014;Xing et al, 2015) with modern crocodylian trackways may allow inferences about terrestrial locomotion of the extinct trackmakers (Carpenter, 2009). Consequently we believe that detailed information about traces made by extant crocodylian species will be of considerable value for interpreting traces attributed to living crocodylians as well as those of ancient crocodylomorphs and other quadrupedal archosaurs.…”

Pedal Proportions of Poposaurus gracilis: Convergence and Divergence in the Feet of Archosaurs

“…Typical footprints attributed to dinosauromorphs and true dinosaurs reflect a functionally tridactyl, symmetrical pes (Carrano and Wilson, ; Marsicano et al, ), with digit III being longest. This feature can be seen in ichnotaxa such as Atreipus , Grallator , and Eubrontes from the Middle–Late Triassic and Early Jurassic (Haubold and Klein, ; Klein et al, ; Lagnaoui et al ; Fig. H–J; Fig.…”

“…Chirotherium barthii (Fig. D) has a nearly symmetrical digit group II–IV, a reduced digit I, and a thumblike and backward curved digit V with a well‐defined non‐ungual portion (Haubold, ; Klein et al, ). The distinct digit V impression distinguishes Chirotherium barthii from the reconstructed Poposaurus footprint.…”