After Whittington, Chang, Dean, Fortey, Jell, Laurie, Palmer, Repina, Rushton & Shergold, 1997, Gon, 2002 and Lieberman, 2001

<==o †Olenellina Walcott, 1890b [taxonomic history]
   |?-o †Poletaevella Dalmatov & Repina, 1971
   |  `-- †P. baljutica Dalmatov & Repina, 1971
   |?-o †Postfallotaspis Orlowski, 1985
   |  `-- †P. spinatus Orlowski, 1985
   `--o †Fallotaspidoidea Hupé, 1953  [taxonomic history]
      |?-o †Fallotaspidella Repina, 1961 [paraphyletic Archaeaspididae Repina, 1979]
      |  `-- †F. musatovi Repina, 1961
      |--+--o †Archaeaspis Repina in Khomentovskii & Repina, 1965 [paraphyletic Archaeaspididae Repina, 1979]
      |  |  |-- †A. hupei Repina in Khomentovskii & Repina, 1965
      |  |  `-- †A. macropleuron Lieberman, 2002
      |  `--+--o †Repinaella
      |     |  `-- †R. sibirica (Repina in Khomentovskii & Repna, 1965)
      |     `-- †Fallotaspididae Hupé, 1953 [taxonomic history]
      `--+--o †Pseudojudomia Egorova, in Goryanskii, Egorova & Savitskii, 1964 [paraphyletic Nevadiidae Hupé, 1953]
         |  `-- †P. egregia Egorova, in Goryanskii, Egorova & Savitskii, 1964
         `--+-- †Plesionevadia burri (Walcott, 1910) Lieberman, 2001
            `--o †Nevadioidea Hupé, 1953 sensu Lieberman, 2001 [=? paraphyletic Nevadiidae Hupé, 1953] [taxonomic history]
               |?-o †Buenellus Blaker, 1988 [paraphyletic Nevadiidae Hupé, 1953]
               |  `-- †B. higginsi Blaker, 1988
               |--o †Nevadia Walcott, 1910 [paraphyletic Nevadiidae Hupé, 1953]
               |  |-- †N. fritzi Lieberman, 2001
               |  `-- †N. weeksi Walcott, 1910
               `--+--o †Nevadella Raw, 1936 [paraphyletic Nevadiidae Hupé, 1953]
                  |  |?- †N. addyensis Okulitch, 1951
                  |  |?- †N. parvoconica Fritz, 1992
                  |  |-- †N. perfecta (Walcott, 1913)
                  |  `--+-- †N. mountjoyi Fritz, 1992
                  |     `--+-- †N. cartlandi (Raw, in Walcott, 1910)
                  |        `-- †N. eucharis (Walcott, 1913) [Callavia eucharis Walcott, 1913]
                  `--+--o †Cirquella Fritz, 1993 [paraphyletic Nevadiidae Hupé, 1953]
                     |  |-- †C. espinata Fritz, 1993
                     |  |-- †C. nummularia Fritz, 1993
                     |  `-- †C. nelsoni Lieberman, 2001
                     `--o †Judomioidea Repina, 1979 sensu Lieberman, 2001 [=? paraphyletic Judomiidae Repina, 1979]
                        |?-o †Judomiella Lazarenko, 1962 [paraphyletic Judomiidae Repina, 1979]
                        |  `-- †J. heba Lazarenko, 1962
                        |?-o †Selindella Repina, 1979 [paraphyletic Archaeaspididae Repina, 1979]
                        |  `-- †S. gigantea Repina, 1979
                        |?-o †Sinskia Suvorova, 1960 [paraphyletic Judomiidae Repina, 1979]
                        |  `-- †S. optabilis Suvorova, 1960
                        |--+--o †Bradyfallotaspis Fritz, 1972 [paraphyletic Archaeaspididae Repina, 1979]
                        |  |  `-- †B. fusa Fritz, 1972
                        |  `--o †Paranevadella Palmer & Repina, 1993 [paraphyletic Judomiidae Repina, 1979]
                        |     `-- †P. subgroenlandicus (Repina, in Khomentovskii & Repina, 1965) [Paedeumias? subgroenlandicus Repina, in Khomentovskii & Repina, 1965]
                        `--+-- †Cambroinyoella wallacei Lieberman, 2001
                           `--+--o †Gerardiella Fritz, 1993 [paraphyletic Archaeaspididae Repina, 1979]
                              |  `-- †G. corneiliana Fritz, 1993
                              `--+-- †Holmiidae: Holmiinae Hupé, 1953 [taxonomic history]
                                 `--+--+--o †Holmiidae: Callaviinae Hupé, 1953a [taxonomic history]
                                    |  |  |?-o †Kjerulfia Kiaer, 1917 [not treated by Lieberman (2001)]
                                    |  |  |  `-- †K. lata Kiaer, 1917
                                    |  |  `--o †Callavia Matthew, 1897
                                    |  |     |-- †C. broeggeri (Walcott, 1890a) [Olenellus (mesonacis) broeggeri Walcott, 1890a]
                                    |  |     `-- †C. crosbyi
                                    |  `--+-- †Callavalonia callavei (Lapworth, 1888) Lieberman, 2001
                                    |     `--+-- †Sdzuyomia lotzei (Richter & Richter, 1941) Lieberman, 2001
                                    |        `--+--o †Judomia Lermontova, 1951 [paraphyletic Judomiidae Repina, 1979]
                                    |           |  |-- †J. dzevanovskii Lermontova, 1951
                                    |           |  |-- †J. rossea Jell & Repina, 1992
                                    |           |  `-- †J. tera Lazarenko in Kryskov et al., 1960
                                    |           `--o †Neltneriidae Hupé, 1953 [taxonomic history]
                                    |              |--o †Bondonella Hupé, 1953
                                    |              |  |-- †B. sdzuyi Geyer & Palmer, 1995
                                    |              |  `-- †B. typica
                                    |              `--o †Neltneria Hupé, 1953
                                    |                 |-- †N. termieriHupé, 1953
                                    |                 `-- †N. jacqueti
                                    `--+--o †Gabriellus Fritz, 1992 [Olenellidae: Gabriellinae Palmer & Repina, 1993]
                                       |  |-- †G. sp. [Lieberman, 2001]
                                       |  `-- †G. lanceatus Fritz, 1992
                                       `--o †Olenelloidea Walcott, 1890 [taxonomic history]
                                          `-- †Olenellidae [taxonomic history]

Reference(s):