Uberon Homology note : Gnathostome ears have a horizontal semicircular duct. This brings their complement
to three semicircular ducts, a pattern retained throughout gnathostome evolution.
[ISBN:978-0030223693 Liem KF, Bemis WE, Walker WF, Grande L, Functional Anatomy of
the Vertebrates: An Evolutionary Perspective (2001) p.58] ; In gnathostomes, each
membranous labyrinth has three semicircular ducts that connect with a chamber known
as the utriculus.[well established][VHOG];
Currated CISMeF NLP mapping