Corynexochida                                                                        Online

  Ectillaenus katzeri (I)                                                                   (-)

         Mýto, Middle Ordovician (ca. 470Mio. Years)

  Phacopida                                                                          

  Placoparia zippei (I)                                                                     (+)

         Sarka Formation, Lower Ordovician (ca. 475Mio. Years)

  Redlichiida

  Paradoxides gracilis (I) (II)                                                            (+) (+)

         Prager Becken, Middle Cambrian (ca. 530Mio. Years)

  Ptychopariida                                                                          

  Ellipsocephalus hoffi (I) (II)                                                            (-)

         Jince, Middle Cambrian (ca. 530Mio. Years)