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Re: [dinosaur] Pterosaurs + T. rex bite + Allosaurus + multituberculates + cave lion cubs + more

You can all stand down regarding the Unwin abstract on naked pterosaurus. Consensus at the conference was that it was not particularly persuasive, and even his co-author Dave Martill admitted later in the conference that he wasn't really convinced himself. Maaaybe something will come of it, but unless and until there's a paper, you can all keep restoring your pterosaurs with pycnofibres.

BTW., the abstract for me own talk from that conference is now available as a PeerJ preprint at https://peerj.com/preprints/27970/ and maybe more excitingly the actual talk is available at https://www.youtube.com/watch?v=miGAdey4US0

-- Mike.

On Thu, 19 Sep 2019 at 21:00, Ben Creisler <bcreisler@gmail.com> wrote:

Ben Creisler

Some recent items:

Scientific American October issue
Pterosaurs Were Monsters of the Mesozoic Skies by ÂMichael Habib



How Pterosaurs Got Their Wings

PBS Eons


However, it's worth noting this abstract (posted yesterday) from the recent 2019 SVPCA meeting that could throw pterosaur paleoart into reverse...
Free pdf:

When the Mesozoic got ugly â naked, hairless, (and featherless) pterosaurs

With key roles in flight, thermoregulation and protection of the body, the integument was of fundamental importance to pterosaurs. Determination of the basic anatomy of this structure could provide a range of new insights into the palaeobiology of these enigmatic volant reptiles. Presently, however, there are several conflicting hypotheses regarding the construction of the integument, all founded on limited numbers of specimens, and not one of which is fully consistent with the available fossil evidence. We have developed a new model based on investigations of more than 100 specimens all of which show some form of exceptional preservation. This data set spans the entire temporal and systematic ranges of pterosaurs and a wide variety of preservational modes. The model has three principal components: (1) A thin epidermal layer. The external surface of the integument was glabrous with a smooth, slightly granular, or polygonal texture. Attenuate 'bristles' fringed the jaws in two anurognathids and small tracts of filaments may have adorned the posterior cranium in some pterosaurs. (2) A layer of reticular and filamentous collagen and of variable thickness and complexity, formed much of the dermis. Helically wound bundles of collagen fibres (aktinofibrils), were present throughout all flight patagia. Variation of aktinofibrils in terms of their dimensions, packing, orientation and stiffness permitted localized variation in the mechanical properties and behaviour of the flight patagia which varied from relatively stiff distally to more extensible and flexible proximally. 'Feather-like' structures reported in Jeholopterus appear to be partially unraveled or decayed aktinofibrils. Collagen fibre bundles were also present in footwebs, and in the integument of the neck and body. These structures have often been mis-identified as 'hair' (pycnofibres). (3) A deep dermal layer with muscles fibres, blood vessels and nerves. The pterosaur integument was profoundly different from that of birds and bats, further emphasizing the sharp disparity between these volant tetrapods.Â

[What we need is a baby pterosaur in amber to see if it's fuzzy...]


University of Wisconsin Oshkosh geology major sinks her teeth into T. rex research (with video)



Concordia College "Cobbers" from Minnesota conduct research through dinosaur dig in Montana and are studying odd Allosaurus find from WyomingÂ



How You Can Watch Paleontologists Clean A Triceratops Skull at Cincinnati Museum Center's Paleontology Lab




Museum of Idaho is wrapping up new renovations and dinosaur exhibit (with video)


Darwin & Dinosaurs exhibit



International experts work to date dinosaur tracks found near Tarija in Bolivia (in Spanish)



Dinosaur teeth found at Angeac site in France this summer (in French)



Issues around Tanzania's claim to Giraffatitan and other fossils at Berlin Museum



The Big 5+ carnivorous dinosaurs of Europe exhibit to open at Museu da Lourinhà Â(in Portuguese)



Prehistoric crocodile fossil discovered in New Mexico




Fossil Feature: Multituberculates (from Cretaceous)
UC Museum of Paleontology, UCMP
with Luke Weaver, PhD Candidate from the University of Washington




North America Has Lost Nearly 3 Billion Birds Since 1970




Cave lion cub mummies found in Siberia reveal new information (with videos)



Palorchestes, giant tree-hugger mammal from Australia





Giant chicken skeleton sculpture in Denver library


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