Uberon definition : Opening/conduit between the nasal cavity and the nasopharynx[AAO] The choanae are
separated by the vomer[WP].;
Uberon synonym : posterior nasal apperture;
Uberon related term : posterior choana; choanae; posterior naris; nasopharyngeal naris;
Uberon broad term : internal naris; choana;
Uberon Homology note : The choana, a unique 'internal nostril' opening from the nasal sac into the roof of
the mouth, is a key part of the tetrapod (land vertebrate) respiratory system. It
was the first component of the tetrapod body plan to evolve, well before the origin
of limbs, and is therefore crucial to our understanding of the beginning of the fish-tetrapod
transition. (...) Here we present new material of Kenichthys, a 395-million-year-old
fossil fish from China, that provides direct evidence for the origin of the choana
and establishes its homology: it is indeed a displaced posterior external nostril
that, during a brief transitional stage illustrated by Kenichthys, separated the maxilla
from the premaxilla.[well established][VHOG];
Uberon Taxon note : Fish don't have choanae, instead they have two pairs of external nostrils;
Automatic exact mappings (from CISMeF team)