Families not included by Baker and his students included the Hynobiidae, (previously described by Yamagiwa, 1924), Dicamptodontidae
(briefly described later by de Marco, 1952), and the Rhyacotritonidae (about which no current data exist).
Because of this and the overall size of the vertebra (see below) SEKI-20167 does not belong to Ambystoma (mole salamanders, Ambystomatidae) or Diacamptodon (giant salamanders, Dicamptodontidae
[Dicamptodontinae of Frost et al.
These manuscripts covered morphological aspects of all salamander families except for the Dicamptodontidae and Rhyacotritonidae.
A similar statement can be made about the male genital and urinary ducts with the exclusion of the Rhyacotritonidae (Chase, 1923; Yamagiwa, 1924; Francis, 1934; Baker, 1945; Baker and Taylor, 1964; Baker, 1965; Ratcliff, 1965; Willett, 1965; Strickland, 1966; Rosenquist and Baker, 1967), although urogenital characteristics of the Dicamptodontidae are also limited (de Marco, 1952).
Characters of the diapophyses and parapophyses (presented above) and the overall size of the vertebrae omit the fossils from the Rhyacotritonidae, Ambystomatidae, Dicamptodontidae
, and Salamandridae.