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[dinosaur] Psittacosaurus eye in the new "cute" model--how realistic?




Ben Creisler
bcreisler@gmail.com

Depiction of the Psittacosaurus eye in new model: 

Picture gallery (note parrot eye in one slide)

https://www.theguardian.com/science/2016/sep/14/scientists-reveal-most-accurate-depiction-of-a-dinosaur-ever-created#img-1

video

https://www.youtube.com/watch?v=BEzguRJAuXE


The sclera appears to be shown as almost fully visible in front (as in humans), although virtually all other living tetrapods (including birds, crocodiles, turtles, lizards and mammals (notably non-human primates such as great apes)) have sclera that are covered by soft tissue in the form of eye lids or skin, and so only slightly visible around the edges if the eye moves. In Psittacosaurus (and in other dinosaurs and in birds) the eye was supported by internal sclerotic plates that surrounded the iris and pupil (crocodile and mammal eyes lack such plates).

The "cute" Psittacosaurus model appears to show the sclera (yellowish in color) as visible with the lids around a wide ring rather than exposing only the iris and pupil as in living non-human animals. This gives the dinosaur a "big, round eye" look, a bit  reminiscent of a cartoon baby face. 

Other artistic representations of Psittacosaurus typically show only the iris and pupil as exposed, with the sclera hidden. This covered sclera reconstruction is likely more accurate and gives the dinosaur a more birdlike (rather than babyish) look, maybe not quite as appealing and cuddly
(although the Ewoks of Star Wars fame had typical, sclera-hidden animal-like eyes, a bit like big-eyed waif paintings, which don't show much white around the eyes).

See:

http://carnivoraforum.com/topic/9907045/1/

Claims that this Psittacosaurus model is the most realistic depiction of a dinosaur ever may be a bit off, at least regarding the eyes...