Amphirhina are animals, a
phylogenetic classification within the
subphylum vertebrata. They are more commonly known as the
Branch Gnathostomata, and are described as having double nasal chambers, or nostrils, and jaws. The parallel branch in this naming system is
Monorhina (more commonly
Agnatha), which possess a single nostril and a circular mouth without jaws. The
ears of all animals within Amphirhina possess three
semicircular canals.
[http://dante.uark.edu/aas/issues/1956v9/v9a5.pdf]
References
Vertebrate taxonomy
{{vertebrate-stub