Order Araneida Clerck, 1757 - spiders
   Suborder Araneae Clerck, 1757 - tailless spiders
     Infraorder Opisthothelae Pocock, 1892 - unsegmented spiders
       Microorder Mygalomorpha Pocock, 1892 - mygalomorphs see [unranked] Mygalomorphae Pocock, 1892
         Family †Fossilcalcaridae Wunderlich, 2015 [monotypic]
           Genus †Fossilcalcarus Wunderlich, 2020, orth. inval. [monotypic] see Genus Fossilcalcar Wunderlich, 2015
             †Fossilcalcarus praeteritus Wunderlich, 2015