Trilobita - Corynexochida - Missisquoiidae
Parent taxon: Leiostegioidea according to S. R. Westrop 2013
See also Adrain 2011 and Jell and Adrain 2002
Sister taxa: Kaolishaniidae, Leiostegiidae
Subtaxa: Hardyia Lunacrania Parakoldinioidia Pseudokoldinioidia Tasmanocephalus
Ecology: nektobenthic carnivore
Distribution:
• Arenig of China (1 collection)
• Ordovician of Australia (2), Canada (1: Newfoundland and Labrador), United States (2: Nevada, New Mexico)
• Tremadoc of Canada (7: Alberta), China (1), United States (1: Vermont)
• Skullrockian of United States (3: New York)
• Taoyuanian of China (4)
• Cambrian of Australia (4), Canada (10: Alberta, Newfoundland and Labrador), China (5), United States (7: New Mexico, New York, Texas)
Total: 48 collections including 52 occurrences