After Whittington, Chang, Dean, Fortey, Jell, Laurie, Palmer, Repina, Rushton & Shergold, 1997
<==o †Yukoniidae S. Zhang, 1980 [nom. transl. et emend. Jell, in Whittington et al., 1997 ex Yukoniinae S Zhang in W. Zhang, Lu et al., 1980] |--o †Yukonia Palmer, 1968 | `-- †Y. intermedia Palmer, 1968 |--o †Alaskadiscus S. Zhang in W. Zhang, Lu et al., 1980 | `-- †A. spinosa (Palmer, 1968) [Neocobboldia spinosa Palmer, 1980] |--o †Egyngolia Korobov, 1980 [Mongolodiscus Korobov, 1980] | |-- †E.obtusa Korobov, 1980 | `-- †E. zaicevi (Korobov, 1980) [Mongolodiscus zaicevi Korobov, 1980] |--o †Ekwipagetia Fritz, 1973 | `-- †E. plicofimbria Fritz, 1973 |--o †Hebediscina Rasetti, 1972 [Szechuanaspis Chien & Yao in Lu et al., 1974; Zhenbadiscus S. Zhang in W. Zhang, Lu et al., 1980] | |-- †H. sardoa Rasetti, 1972 | |-- †H. longispinus (Chien & Yao in Lu et al., 1974) [Szechuanaspis longispinus Chien & Yao in Lu et al., 1974] | `-- †H. typicalis (S. Zhang in W. Zhang, Lu et al., 1980) [Zhenbadiscus typicalis S. Zhang in W. Zhang, Lu et al., 1980] |--o †Lenadiscus Repina in Khomentovskii & Repina, 1965 | `-- †L. unicus Repina in Khomentovskii & Repina, 1965 `--o †Yukonides Fritz, 1972 `-- †Y. lacrinus Fritz, 1972
Reference(s):
- Whittington, H. B., Chang, W. T., Dean, W. T., Fortey, R. A., Jell, P. A., Laurie, J. R., Palmer, A. R., Repina, L. N., Rushton, A. W. A. & Shergold, J. H., 1997: Systematic Description of the class Trilobita. 331-481.
in Kaesler, R. L., (eds.) 1997: Treatise on Invertebrate Paleontology, Part O, Arthropoda 1, Trilobita, Revisited, vol 1: Indroduction, Order Agnostida; Order Redlichiida.
–The Geological Society of America, Inc. and The University of Kansas, Boulder, Colorado & Lawrence, Kansas, 1997, xxiv-530