[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: How would Tyrannosaurus approach a Triceratops?
Jaime A. Headden wrote-
Note that tyrannosaurs are not really well known for their scleral
such that, unlike birds, their eyes were free from these physical
Tyrannosaurids did have sclerotic rings. Here's what Hurum and Sabath have
to say about Tarbosaurus-
"The sclerotic ring is only preserved in a subadult specimen with the skull
length of about 0.8 metre,
GIN 100/70. Here the sclerotic ring has an external diameter of about
65mmand internal diameter of 30 mm. It consists of 15 plates. The sclerotic
ring is still relatively large in this juvenile individual, and the orbit is
almost oval. The ?keyhole shape? of the orbit in adults defines the space
for the eye at the upper end. The eye in juveniles would also occupy
proportionally more of the orbit."