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 Olenekella Platydiamesus Polyariella Rasettaspis Rasettia Resseraspis Tatonaspis Yurakia
Ecology: nektobenthic carnivore
Distribution:
• Ordovician of Canada (1: Yukon collection), United States (4: Idaho, Texas)
• Cressagian of South Korea (1)
• Taoyuanian of the Russian Federation (2)
• Cambrian of Canada (37: Alberta, Newfoundland and Labrador, Northwest Territories, Quebec, Yukon), the Russian Federation (8), United States (10: Alaska, Nevada, South Dakota, Vermont, Wisconsin, Wyoming)
Total: 63 collections including 81 occurrences