Tropibasic Skull

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Tropibasic Skull

 

a type of axial skull with a narrow base and close-set orbits. The space between the orbits is in the form of a septum, in back of which the brain is situated. A tropibasic skull is characteristic of most teleostomian fishes, reptiles (except snakes), and birds. Among fossil vertebrates, it is typical of cros-sopterygian fishes and many stegocephalian amphibians.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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