Uberon Homology note : The tetrapod clade develops a complete atrial septum and loses the fifth aortic arch
altogether. [ISBN:978-0030223693 Liem KF, Bemis WE, Walker WF, Grande L, Functional
Anatomy of the Vertebrates: An Evolutionary Perspective (2001) p.620]; [about heart
development] In the various tetrapod classes ontogenetic events essentially recapitulate
the phylogenetic stages.[well established][VHOG];