After Nydam, 2000, with Recent species from Uetz, Etzold & Chenna, 1995-2000 [“The TIGR Reptile Database ” (former EMBL Reptile Database)]

<==o Monstersauria Norell & Gao, 1997 sensu Nydam, 2000 [Estesioidea]
   |?- †Labrodioctes
   |?- †Telmasaurus grangeri Gilmore, 1943
   |-- †Gobiderma pulchrum Borsuk-Bialynicka, 1984 [Gobidermatidae]
   `--o Helodermatoidea
      |-- †Paraderma bogerti Estes, 1964
      |-- †Primaderma nessovi Nydam, 2000
      `--+-- †Estesia mongoliensis Norell et al., 1992
         `--+-- †Eurheloderma gallicum Hoffstetter, 1957
            `--+-- †Lowesaurus matthewi Pregill, Gauthier & Greene, 1986
               `--o Helodermatidae (myrkkyliskot)
                  |?- ?†Helodermatidae indet. Augé, 2003; L.Eoc. WEu.
                  `--o Heloderma Cope, 1896 (myrkkyliskot)
                     |-- †H. texana
                     |--o H. suspectum Cope, 1896 (gilahirviö; gila monster)
                     |  |-- H. s. cinctum Bogert & Martín del Campo, 1956 (Banded Gila Monster)
                     |  `-- H. s. suspectum Cope, 1896  (Reticulate Gila Monster)
                     `--o H. horridus (Wiegmann, 1829) (skorpionilisko; beaded lizard)
                        |-- H. h. horridus (Wiegmann, 1829)
                        |-- H. h. alvarezi Bogert & Martín del Campo, 1956
                        |-- H. h. exasperatum Bogert & Martín del Campo, 1956
                        `-- H. h. charlesbogerti Campbell & Vannini, 1988

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