After Størmer, Petrunkevitch & Hedgpeth, 1955

<==o †Aglaspidida Walcott, 1911 [sensu lato?]
   |--o †Strabopida (Gerhardt, 1932) Hou & Bergström, 1997
   |  `--o †Strabopidae Gerhardt, 1932 [Paleomeridae Størmer, 1955]
   |     |-- †Paleomerus hamiltoni Størmer, 1955 [Paleomeridae]
   |     |-- †Strabops thacheri Beecher, 1901 [non Jordan, 1904]
   |     `-- †Neostrabops martini Caster & Macke, 1952
   `--o †Aglaspidida Walcott, 1911 [sensu stricto?]
      |?- †Chlupacaris dubia Van Roy, 2005
      |?- †Lemoneites [Lemoneitidae] [also treated as Xiphosuran]
      |-- †Beckwithia typa Resser, 1931 [Beckwithiidae Raasch, 1939]
      `--o †Aglaspididae Miller, 1877
         |--o †Aglaspis Hall, 1862
         |  |-- †A. barrandei Hall, 1862
         |  |-- †A. spinifera Raasch
         |  `-- †A. simplex Raasch
         |--o †Aglaspella Raasch, 1939
         |  |-- †A. granulifera
         |  `-- †A. eatoni Raasch, 1939
         |-- †Glypharthrus thomasi (Walter, 1924) Raasch, 1939 [Eurypterus thomasi Walter, 1924]
         |-- †Aglaspoides sculptilis Raasch, 1939
         |-- †Uarthrus instabilis Raasch, 1939
         |-- †Cyclopites vulgaris (Raasch, 1939) Raasch, 1952 [Cyclopina vulgaris Raasch, 1939]
         |-- †Craspedops modesta Raasch, 1939
         `-- †Setaspis spinulosa Raasch, 1939

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