Ben Creisler
Some recent (and sort of recent) items with free pdfs that are dinosaur-related:
This special issue of the Anatomical Record:The Hidden World of Dinosaurs has already been mentioned. However, ALL of the papers (not just a few) have recently made free (at least for now). All of these papers were posted in DML earlier with abstracts in advance publication form (mostly paywalled).
Here's the list with links and updatedÂcitation details.
Anatomical Record 303(4): Â635-637
https://anatomypubs.onlinelibrary.wiley.com/toc/19328494/2020/303/4
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Emma R. Schachner Randall B. Irmis Adam K. Huttenlocker Kent Sanders Robert L. Cieri Sterling J. Nesbitt
Osteology of the Late Triassic Bipedal Archosaur Poposaurus gracilis (Archosauria: Pseudosuchia) from Western North America.
Anatomical Record 303(4): 874-917
doi:
https://doi.org/10.1002/ar.24298https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24298Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24298====
Gregory F. Funston, Ryan D. Wilkinson, D. Jade Simon, Aaron H. Leblanc, Mateusz Wosik & Philip J. Currie (2020)
Histology of Caenagnathid (Theropoda, Oviraptorosauria) Dentaries and Implications for Development, Ontogenetic Edentulism, and Taxonomy.
Anatomical Record 303(4): 918-934
doi:
https://doi.org/10.1002/ar.24205https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24205Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24205===
Brandon P. Hedrick, Erika Goldsmith, Hector RiveraâSylva, Anthony R. Fiorillo, Allison R. TumarkinâDeratzian & Peter Dodson (2020)
Filling in Gaps in the Ceratopsid Histologic Database: Histology of Two Basal Centrosaurines and an Assessment of the Utility of Rib Histology in the Ceratopsidae.
Anatomical Record 303(4): 935-948
doi:
https://doi.org/10.1002/ar.24099https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24099Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24099
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Wulong bohaiensis gen. et sp. nov.
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Delphine Angst, Jonathan Barnoud, RaphaÃl Cornette & Anusuya Chinsamy (2020)
Sex and Ontogenetic Variation in the Crest of Numida meleagris: Implications for Crested Vertebrates.
Anatomical Record 303(4): 1018-1034
doi:
https://doi.org/10.1002/ar.24275https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24275Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24275===
Christopher R. Torres, Mark A. Norell & Julia A. Clarke (2020)
Estimating Flight Style of Early Eocene Stem Palaeognath Bird Calciavis grandei (Lithornithidae).
Anatomical Record 303(4): 1035-1042
doi:
https://doi.org/10.1002/ar.24207https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24207Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24207=====
Matthew McKeown, Stephen L. Brusatte, Thomas E. Williamson, Julia A. Schwab, Thomas D. Carr, Ian B. Butler, Amy Muir, Katlin Schroeder, Michelle A. Espy, James F. Hunter, Adrian S. Losko, Ronald O. Nelson, D. Cort Gautier & Sven C. Vogel (2020)
Neurosensory and Sinus Evolution as Tyrannosauroid Dinosaurs Developed Giant Size: Insight from the Endocranial Anatomy of Bistahieversor sealeyi.
Anatomical Record 303(4): 1043-1059
doi:
https://doi.org/10.1002/ar.24374https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24374Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24374=====
Casey M. Holliday, William Ruger Porterm Kent A. Vliet & Lawrence M. Witmer (2020)
The Frontoparietal Fossa and Dorsotemporal Fenestra of Archosaurs and Their Significance for Interpretations of Vascular and Muscular Anatomy in Dinosaurs.
Anatomical Record 303(4): 1060-1074
doi:
https://doi.org/10.1002/ar.24218https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24218Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24218====
William Ruger Porter & Lawrence M. Witmer (2020)
Vascular Patterns in the Heads of Dinosaurs: Evidence for Blood Vessels, Sites of Thermal Exchange, and Their Role in Physiological Thermoregulatory Strategies.
Anatomical Record 303(4): 1075-1103
doi:
https://doi.org/10.1002/ar.24234https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24234Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24234=======
Ali Nabavizadeh (2020)
Cranial Musculature in Herbivorous Dinosaurs: A Survey of Reconstructed Anatomical Diversity and Feeding Mechanisms.
Anatomical Record 303(4): 1104-1145
doi:
https://doi.org/10.1002/ar.24283https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24283Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24283==
Walter S. Persons & Philip J. Currie (2020)
The Anatomical and Functional Evolution of the Femoral Fourth Trochanter in Ornithischian Dinosaurs.
Anatomical Record 303(4): 1146-1157
doi:
https://doi.org/10.1002/ar.24094https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24094Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24094====
Christopher T. Griffin & Sterling J. Nesbitt (2020)
Does the Maximum Body Size of Theropods Increase across the TriassicâJurassic Boundary? Integrating Ontogeny, Phylogeny, and Body Size.
Anatomical Record 303(4): 1158-1169
doi:
https://doi.org/10.1002/ar.24130https://anatomypubs.onlinelibrary.wiley.com/doi/full/10.1002/ar.24130Free pdf:
https://anatomypubs.onlinelibrary.wiley.com/doi/pdf/10.1002/ar.24130
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The new issue of Geoscientist (for a general audience) has two dinosaur articles:ÂÂ
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Paul Johnson (2020)Â
Free pdf:
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Recent Chinese non-dino papers in English that suggest what some dinosaurs, pterosaurs, or other vertebrates might have been eating.
Mimicry and secondary defense are staples among predator-prey interactions. Among insects, the stick and leaf insects are masters of camouflage. Nonetheless, a meager understanding of their origin and early mimetic evolution persists. Here we report the earliest mimetic and defensive strategies of a stick insect from the Middle Jurassic of China, Aclistophasma echinulatum gen. et sp. nov., exquisitely preserving abdominal extensions and femoral spines. The distribution of these characters mapped onto the phylogeny of Phasmatodea reveals that abdominal extensions and femoral spines developed multiple times during the evolution of stick insects, and indicates that the origin of abdominal extensions predates other modifications, while tergal extensions predate other expansions of the body, such as those of the sterna and pleura, as well as defensive femoral spines. The new fossil provides clues into early antipredator defensive strategies and allows inferences as to the potential environment and predators, and reveals mimetic and defensive mechanisms of stick insects from 165 million years ago.
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Frugivory is an important ecological tie between animals and angiosperms. It plays an important role in the evolution of food webs and energy flow networks in the ecosystem. However, little is known about how old this relationship can be due to lack of relevant fossil evidence. Here, the authors report a fossil fruit, Jurafructus gen. nov., a putative angiosperm from the MiddleâLate Jurassic (>164 Ma) of Daohugou Village, Inner Mongolia, China, which provides the currently earliest evidence of frugivory. The fossil is a more or less three-dimensionally preserved coalified drupe that has been damaged by animals in two different ways. The pericarp, in addition to the seed coat surrounding parenchyma seed contents, is suggestive of an angiospermous affinity, as such a 3+3 structure is distinct from a three-layered seed coat in gymnosperms. The seed possesses a distal micropyle, attached on the base of the pericarp, suggestive of a former orthotropous ovule in the gynoecium. The damaged pericarp of Jurafructus suggests that frugivory can be dated back to the Middle-Late Jurassic. Apparently, the ecological relationship between angiosperms and animals extends deep into the fossil record.