†family Illaenuridae Vodges 1890 (trilobite)
Trilobita - Corynexochida - Illaenuridae
Parent taxon: Leiostegiina according to J. M. Adrain 2011
See also Whittington et al. 1997
Sister taxa: Leiostegioidea, Shirakiellidae
Subtaxa: Ambonolium Lecanopyge Lecanopygidae Minicephalus Platydiamesus Polyariella Rasettaspis Rasettia Resseraspis Tatonaspis Yurakia
Ecology: nektobenthic carnivore
Distribution:
• Ordovician of Canada (1: Yukon collection), South Korea (1), United States (4: Idaho, Texas)
• Cambrian of Canada (37: Alberta, Newfoundland and Labrador, Northwest Territories, Quebec, Yukon), the Russian Federation (9), United States (7: South Dakota, Vermont, Wisconsin, Wyoming)
Total: 59 collections including 77 occurrences