Here’s an observation
of convergence you won’t see anywhere else.
Many artists and scientists say uropatagia enabled Sharovipteryx to glide,
but no one will ever imagine a gliding Psittacosaurus.
So… maybe uropatagia are not gliding membranes in non-pterosaurs.
Of what use are uropatagia in nonvolant tetrapods?
1) heat sink to cool the largest, most active muscles of the body;
2) extradermal areas for decoration;
3) shade/protection over egg clutches.
4) Anything else?
(Osborn 1923, You et al. 2008) is a sister to Yinlong with a larger rostrum and no premaxillary teeth in the LRT. Psittacosaurus is known from a wide variety of specimens with distinct skull shapes.
Mayr G, Peters SD, Plodowski G and Vogel O 2002. Bristle-like integumentary structures at the tail of the horned dinosaur Psittacosaurus. Naturwissenschaften. 89 (8): 361–365.
Osborn HF 1923. Two Lower Cretaceous dinosaurs from Mongolia. American Museum Novitates 95: 1–10.
You H−L, Tanou K and Dodson P 2008. New data on cranial anatomy of the ceratopsian dinosaur Psittacosaurus major. Acta Palaeontologica Polonica 53 (2): 183–196.
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