Trilobita - Asaphida - Eurekiidae
Parent taxon: Asaphida according to H. B. Whittington et al. 1997
See also Adrain 2011 and Westrop et al. 2005
Sister taxa: Aethodionide, Anomocarellidae, Anomocaridae, Anomocaroidea, Asaphina, Asaphoidea, Cyclopygoidea, Dikelocephaloidea, Hungaiidae, Ordosiidae, Parabumasttides, Pseudocyclopyge, Remopleuridae, Rhyssometopidae, Trinucleoidea
Subtaxa: Arcadiaspis Bandalaspis Bayfieldia Corbina Corbinia Eurekia Leocephalus Lochmanaspis Magnacephalus Maladia Tostonia
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Ordovician of Canada (3: Newfoundland and Labrador, Yukon collections)
• Tremadoc of United States (1: Texas)
• Skullrockian of United States (1: Texas)
• Cambrian of Australia (1), Canada (25: Alberta, Newfoundland and Labrador, Quebec, Yukon), United States (29: Alaska, Montana, Nevada, Texas, Utah, Vermont, Wisconsin, Wyoming)
Total: 60 collections including 82 occurrences