Results 21 to 30 of about 99 (83)

Two anurognathid pterosaur specimens from the Yanliao Biota and a new interpretation of anurognathid skulls [PDF]

open access: yes古脊椎动物学报 (中英文版)
Anurognathids are a clade of small, early-diverging non-pterodactyloid pterosaurs distributed across Eurasia from the Middle Jurassic to the Early Cretaceous.
TONG Shi-Da, JIANG Shun-Xing, CHENG Xin, WANG Xiao-Lin
doaj   +1 more source

The cranial, mandibular, and hyoid anatomy of softshell turtles (Trionychidae): A revised character list for phylogenetic analysis

open access: yesThe Anatomical Record, EarlyView.
Abstract Softshell turtles (Pan‐Trionychidae) are an early branching clade of hidden‐necked turtles (Cryptodira) with a rich fossil record extending back to the Early Cretaceous. The evolutionary history of softshell turtles is still unresolved because of their conservative morphology combined with high levels of polymorphism related to morphological ...
Léa C. Girard, Walter G. Joyce
wiley   +1 more source

Effectiveness of Video Demonstration over Conventional Methods in Teaching Osteology in Anatomy [PDF]

open access: yesJournal of Clinical and Diagnostic Research, 2017
Introduction: Technology and its applications are the most happening things in the world. So, is it in the field of medical education. This study was an evaluation of whether the conventional methods can compete with the test of technology.
Angela A Viswasom, Abraham Jobby
doaj   +1 more source

Comparative cranial biomechanics reveal macroevolutionary trends in theropod dinosaurs, with emphasis on Tyrannosauroidea

open access: yesThe Anatomical Record, EarlyView.
Abstract Tyrannosaurus is viewed as a model organism in vertebrate paleontology, with numerous studies analyzing its feeding biomechanics. Nonetheless, the evolution of this feeding performance has been under‐addressed in Tyrannosauroidea, especially in basal tyrannosauroids. Here we used muscle‐force reconstruction and finite element analysis (FEA) to
Evan Johnson‐Ransom   +4 more
wiley   +1 more source

Comparative osteology of Chondrostoma orientale and C. nasus

open access: yesیافته‌های نوین در علوم زیستی, 2020
Comparison of morphological structures is a key element in evolutionary biology and taxonomy, as well as in the studies concerning variation and biodiversity either at interspecific or intraspecific levels. This study aimed to compare the bony structures
Sayyed Ali Moezzi   +2 more
doaj  

The comparative osteology of Plesiochelys bigleri n. sp., a new coastal marine turtle from the Late Jurassic of Porrentruy (Switzerland) [PDF]

open access: yesPeerJ, 2017
Background During the Late Jurassic, several groups of eucryptodiran turtles inhabited the shallow epicontinental seas of Western Europe. Plesiochelyidae are an important part of this first radiation of crown-group turtles into coastal marine ecosystems.
Christian Püntener   +2 more
doaj   +2 more sources

Nasal soft‐tissue anatomy of Triceratops and other horned dinosaurs

open access: yesThe Anatomical Record, EarlyView.
Abstract Although ceratopsid dinosaurs possess a characteristically hypertrophied narial region, soft‐tissue anatomy associated with such a skeletal structure and their biological significance remain poorly understood. The present study provides the first comprehensive hypothesis on the soft‐tissue anatomy in the ceratopsid rostrum based on the Extant ...
Seishiro Tada   +5 more
wiley   +1 more source

Comparative appendicular osteology of Tor spp. (Cyprinidae) in Indonesia

open access: yesDepik Jurnal
Tor tambroides, T. tambra, T. douronensis, and T. soro are native fish species to Indonesia with their natural habitat generally being upstream of rivers in hilly areas with clear water and strong currents.
Yusrizal Akmal   +7 more
doaj   +1 more source

Chromosomal evolution and phylogenetic considerations in cuckoos (Aves, Cuculiformes, Cuculidae).

open access: yesPLoS ONE, 2020
The Cuckoos have a long history of difficult classification. The species of this order have been the subject of several studies based on osteology, behavior, ecology, morphology and molecular data.
Michelly da Silva Dos Santos   +8 more
doaj   +1 more source

'Nedoceratops': an example of a transitional morphology. [PDF]

open access: yesPLoS ONE, 2011
BackgroundThe holotype and only specimen of the chasmosaurine ceratopsid dinosaur 'Nedoceratops hatcheri' has been the source of considerable taxonomic debate since its initial description.
John B Scannella, John R Horner
doaj   +1 more source

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