This report is a comparative study of the hyobranchial skeleton of the three species in the family Cyptobranchidae and four species of the family Hynobiidae, all of which are figured. Anatomical differences between the cryptobranchids and their relationship to hynobiids are noted and discussed. Reference is made to a relationship that may exist between these families and other salamander families, particularly the possible relationship of the Hynobiidae to the super families Ambystomatoidea or possibly Plethodontoidea.
Cox, Douglas C. and Tanner, Wilmer W.
"Hyobranchial apparatus of the Cryptobranchoidea (Amphibia),"
Great Basin Naturalist: Vol. 49
, Article 2.
Available at: http://scholarsarchive.byu.edu/gbn/vol49/iss4/2