Results 51 to 60 of about 929 (163)
The osteoderm microstructure in doswelliids and proterochampsids and its implications for palaeobiology of stem archosaurs [PDF]
Acta Palaeontologica Polonica, 2017 Osteoderms are common in most archosauriform lineages, including basal forms, such as doswelliids and proterochampsids. In this survey, osteoderms of the doswelliids Doswellia kaltenbachi and Vancleavea campi, and proterochampsid Chanaresuchus bonapartei
Denis A. Ponce +3 more
doaj +1 more source
Journal of Anatomy, EarlyView.A three‐dimensional model is used to analyze the locomotor biomechanics of the large Late Triassic archosaurian reptile Postosuchus kirkpatricki. The study finds that it is more uncertain than previously concluded whether it was quadrupedal or bipedal, and plantigrade or digitigrade, but it clearly had locomotor specializations including large hindlimb
John R. Hutchinson +6 more
wiley +1 more source
Paleohistology and lifestyle inferences of a dyrosaurid (Archosauria: Crocodylomorpha) from Paraíba Basin (northeastern Brazil). [PDF]
PLoS ONE, 2014 Among the few vertebrates that survived the mass extinction event documented at the Cretaceous-Paleocene boundary are dyrosaurid crocodylomorphs. Surprisingly, there is little information regarding the bone histology of dyrosaurids, despite their ...
Rafael César Lima Pedroso de Andrade +1 more
doaj +1 more source
The pectoralis muscle orientation as an indicator of the modes of wing‐propelled locomotion in birds
Journal of Anatomy, EarlyView.The pectoralis orientation of birds was consistent with the orientation of the aerodynamic force acting on the wing, varying by wing‐propelled locomotion (WPL) mode. The skeletal morphology unique to each WPL mode, related to the origin/insertion of the pectoralis, may be associated with these functional demands of pectoralis orientation.
Takumi Akeda, Shin‐ichi Fujiwara
wiley +1 more source
Hind limb osteology of Gracilisuchus stipanicicorum (Archosauria: Pseudosuchia)
Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 2012 ABSTRACTGracilisuchus stipanicicorum Romer, 1972, from the Middle-Late Triassic of the Ischigualasto–Villa Unión Basin of Argentina, is an extinct pseudosuchian archosaur on the stem to Crocodylomorpha. The pelvic girdle and hind limb anatomy of a referred specimen of Gracilisuchus stipanicicorum is described and compared with that from a broad range ...
Lecuona, Agustina, Desojo, Julia Brenda
openaire +2 more sources
Phylogenetic Reconstruction of Lung Evolution in Extant Squamata
Journal of Zoology, EarlyView.The Squamata group exhibits remarkable diversity in lung structure. However, a comprehensive understanding of how this variation evolved within the clade is still lacking. To reconstruct the evolutionary history of lungs of living squamates, we conducted comparative phylogenetic analyses using categorized lung traits, such as lung type, respiratory ...
Barbara de Godoi Champini +2 more
wiley +1 more source
The Evolution of Body Shape and Locomotion in Archosauria [PDF]
, 2019 Locomotion is essential to the survival of all organisms. Extant animals display a broad range of adaptations to a wide range of locomotor behaviours. Locomotion can be observed directly in living animals, but this is not the case for fossil taxa which are known from only skeletal material.
openaire +1 more source
Postparietal and prehatching ontogeny of the supraoccipital in Alligator mississippiensis (Archosauria, Crocodylia) [PDF]
Journal of Morphology, 2001 AbstractThe first record of the postparietal bone of Alligator mississippiensis, documented by transverse histological sections, is presented. It is the first evidence of the presence of this bone within Recent reptiles. The postparietal is present in a specimen with a head length of 32.3 mm.
openaire +3 more sources
The Anatomical Record, Volume 309, Issue 6, Page 1451-1463, June 2026.Abstract Notosuchians were key components of western Gondwanan Cretaceous ecosystems in terrestrial predator niches and exhibited remarkable taxonomic and ecological diversity. Previous research has explored their physiology, metabolism, and histology, revealing varied growth patterns and life history strategies.
Tito Aureliano +5 more
wiley +1 more source
A re-evaluation of the enigmatic dinosauriform Caseosaurus crosbyensis from the Late Triassic of Texas, USA and its implications for early dinosaur evolution [PDF]
Acta Palaeontologica Polonica, 2018 The holotype specimen of the Late Triassic dinosauriform Caseosaurus crosbyensis is redescribed and evaluated phylogenetically for the first time, providing new anatomical information and data on the earliest dinosaurs and their evolution within the ...
Matthew G. Baron, Megan E. Williams
doaj +1 more source