Sordes pilosus and the nature of the pterosaur flight apparatus

@article{Unwin1994SordesPA,
  title={Sordes pilosus and the nature of the pterosaur flight apparatus},
  author={David M. Unwin and Natasha N. Bakhurina},
  journal={Nature},
  year={1994},
  volume={371},
  pages={62-64}
}
IT is now generally accepted that pterosaurs, Mesozoic reptiles, were true fliers, but the nature of their flight apparatus is still much disputed. Evidence has been presented in favour of bird-like reconstructions with narrow, stiff wings free of the legs1–6 and bat-like reconstructions with extensive wings incorporating both fore and hind limbs7–10, but the Solnhofen Limestone pterosaurs, upon which these models are based, are not sufficiently well preserved to resolve these conflicting… 
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References

SHOWING 1-10 OF 11 REFERENCES
Flight characteristics of Triassic and Jurassic Pterosauria: an appraisal based on wing shape
TLDR
The reconstructed pterosaurs show a limited range of wing shape compared to birds; this may partly reflect preservational bias favoring species living in marine or lagoonal environments, but this is not a complete explanation because there is a lack of pterosaur with wings of high loading like the marine ducks and auks.
A functional analysis of flying and walking in pterosaurs
TLDR
Pterosaurs bear close structural resemblances to birds and dinosaurs, to which they are most closely related phylogenetically, and a hypothesis of structural, aerodynamic, and evolutionary differences distinguishing vertebrate gliders from fliers is proposed.
Exceptionally well preserved pterosaur wing membrane from the Cretaceous of Brazil
FOSSILIZED impressions of pterosaur wing membranes are known from a number of localities1,2, but true soft-tissue preservation is extremely rare3,4. We present the first description of the internal
Terrestrial locomotion in pterosaurs
TLDR
It is suggested that in pterosaurs the wing membrane was attached to the upper leg, which helped in stretching, steering and cambering.
ON THE RECONSTRUCTION OF PTEROSAURS AND THEIR MANNER OF FLIGHT, WITH NOTES ON VORTEX WAKES
TLDR
Classical pterosaur reconstructions are variants on a ‘bat‐analogy’, whereby the wing is conceived as a simple membrane with no inherent bending strength, stretched between the arm and leg skeletons, but in recent years an alternative ‘bird‐an analogy’ has come to be generally accepted.
Ein Flugsaurier-Rest aus dem Posidonienschiefer (Unter-Toarcium) von Schandelah bei Braunschweig
A detailed stratigraphic section of the Lower Toarcian Posidonienschiefer of Schandelah near Braunschweig (Niedersachsen, West Germany) is presented, and a pterosaur pelvis from that locality
Biomechanics of Pteranodon
TLDR
The fossil evidence is re-examined to determine the structure of Pteranodon ingens, and it is suggested that extinction could have been due to climatic change, particularly an increase in the average wind speed at the end of the Cretaceous.
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